diff --git a/.travis.yml b/.travis.yml
index a3fd73f..92aea71 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,14 +1,11 @@
 language: php
-sudo: false
-# only needed for PHP 5.5 support as of 2019-07
-dist: trusty
 php:
-  - '5.5'
   - '5.6'
   - '7.0'
   - '7.1'
   - '7.2'
   - '7.3'
+  - '7.4'
 
 # as this is a php project, node.js (for JS unit testing) isn't installed
 install:
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 608716f..1b7523c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,7 @@
 # PrivateBin version history
 
   * **1.4 (not yet released)**
+    * CHANGED: Minimum required PHP version is 5.6, due to a change in the identicon library and to use php's native hash_equals()
     * CHANGED: Upgrading libraries to: DOMpurify 2.0.8
     * CHANGED: Several translations got updated with missing messages
     * CHANGED: Introduce HTML entity encoding on server side (#581)
diff --git a/composer.json b/composer.json
index 8df24e2..c7311a2 100644
--- a/composer.json
+++ b/composer.json
@@ -24,9 +24,9 @@
 		"docs" : "https://privatebin.info/codedoc/"
 	},
 	"require" : {
-		"php" : "^5.5.0 || ^7.0",
+		"php" : "^5.6.0 || ^7.0",
 		"paragonie/random_compat" : "2.0.18",
-		"yzalis/identicon" : "1.2.0"
+		"yzalis/identicon" : "2.0.0"
 	},
 	"require-dev" : {
 		"codacy/coverage" : "dev-master",
@@ -41,4 +41,4 @@
 	"config" : {
 		"autoloader-suffix" : "DontChange"
 	}
-}
\ No newline at end of file
+}
diff --git a/composer.lock b/composer.lock
index 45c323e..9e94eba 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
         "This file is @generated automatically"
     ],
-    "content-hash": "5a34d7babc027b5306652cf3a6d8eaeb",
+    "content-hash": "f40dd67214072fe0962989c04c851bd5",
     "packages": [
         {
             "name": "paragonie/random_compat",
@@ -57,16 +57,16 @@
         },
         {
             "name": "yzalis/identicon",
-            "version": "1.2.0",
+            "version": "2.0.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/yzalis/Identicon.git",
-                "reference": "228eca74299a45163be40fd82d334bf21e66b86b"
+                "reference": "ff5ed090129cab9bfa2a322857d4a01d107aa0ae"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/yzalis/Identicon/zipball/228eca74299a45163be40fd82d334bf21e66b86b",
-                "reference": "228eca74299a45163be40fd82d334bf21e66b86b",
+                "url": "https://api.github.com/repos/yzalis/Identicon/zipball/ff5ed090129cab9bfa2a322857d4a01d107aa0ae",
+                "reference": "ff5ed090129cab9bfa2a322857d4a01d107aa0ae",
                 "shasum": ""
             },
             "require": {
@@ -105,7 +105,7 @@
                 "identicon",
                 "image"
             ],
-            "time": "2017-08-01T14:39:05+00:00"
+            "time": "2019-10-14T09:30:57+00:00"
         }
     ],
     "packages-dev": [
@@ -115,20 +115,21 @@
             "source": {
                 "type": "git",
                 "url": "https://github.com/codacy/php-codacy-coverage.git",
-                "reference": "629d1fd597f91fb072bd822830059fd5145ce49a"
+                "reference": "1852ca987c91ef466ebcfdbdd4e1788b653eaf1d"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/codacy/php-codacy-coverage/zipball/629d1fd597f91fb072bd822830059fd5145ce49a",
-                "reference": "629d1fd597f91fb072bd822830059fd5145ce49a",
+                "url": "https://api.github.com/repos/codacy/php-codacy-coverage/zipball/1852ca987c91ef466ebcfdbdd4e1788b653eaf1d",
+                "reference": "1852ca987c91ef466ebcfdbdd4e1788b653eaf1d",
                 "shasum": ""
             },
             "require": {
                 "gitonomy/gitlib": ">=1.0",
                 "php": ">=5.3.3",
-                "symfony/console": "~2.5|~3.0|~4.0"
+                "symfony/console": "~2.5|~3.0|~4.0|~5.0"
             },
             "require-dev": {
+                "clue/phar-composer": "^1.1",
                 "phpunit/phpunit": "~6.5"
             },
             "bin": [
@@ -152,7 +153,7 @@
             ],
             "description": "Sends PHP test coverage information to Codacy.",
             "homepage": "https://github.com/codacy/php-codacy-coverage",
-            "time": "2018-04-30T16:23:12+00:00"
+            "time": "2020-01-10T10:52:12+00:00"
         },
         {
             "name": "codeclimate/php-test-reporter",
@@ -215,16 +216,16 @@
         },
         {
             "name": "composer/ca-bundle",
-            "version": "1.2.4",
+            "version": "1.2.6",
             "source": {
                 "type": "git",
                 "url": "https://github.com/composer/ca-bundle.git",
-                "reference": "10bb96592168a0f8e8f6dcde3532d9fa50b0b527"
+                "reference": "47fe531de31fca4a1b997f87308e7d7804348f7e"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/composer/ca-bundle/zipball/10bb96592168a0f8e8f6dcde3532d9fa50b0b527",
-                "reference": "10bb96592168a0f8e8f6dcde3532d9fa50b0b527",
+                "url": "https://api.github.com/repos/composer/ca-bundle/zipball/47fe531de31fca4a1b997f87308e7d7804348f7e",
+                "reference": "47fe531de31fca4a1b997f87308e7d7804348f7e",
                 "shasum": ""
             },
             "require": {
@@ -235,7 +236,7 @@
             "require-dev": {
                 "phpunit/phpunit": "^4.8.35 || ^5.7 || 6.5 - 8",
                 "psr/log": "^1.0",
-                "symfony/process": "^2.5 || ^3.0 || ^4.0"
+                "symfony/process": "^2.5 || ^3.0 || ^4.0 || ^5.0"
             },
             "type": "library",
             "extra": {
@@ -267,20 +268,20 @@
                 "ssl",
                 "tls"
             ],
-            "time": "2019-08-30T08:44:50+00:00"
+            "time": "2020-01-13T10:02:55+00:00"
         },
         {
             "name": "doctrine/instantiator",
-            "version": "1.2.0",
+            "version": "1.3.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/doctrine/instantiator.git",
-                "reference": "a2c590166b2133a4633738648b6b064edae0814a"
+                "reference": "ae466f726242e637cebdd526a7d991b9433bacf1"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/doctrine/instantiator/zipball/a2c590166b2133a4633738648b6b064edae0814a",
-                "reference": "a2c590166b2133a4633738648b6b064edae0814a",
+                "url": "https://api.github.com/repos/doctrine/instantiator/zipball/ae466f726242e637cebdd526a7d991b9433bacf1",
+                "reference": "ae466f726242e637cebdd526a7d991b9433bacf1",
                 "shasum": ""
             },
             "require": {
@@ -323,28 +324,28 @@
                 "constructor",
                 "instantiate"
             ],
-            "time": "2019-03-17T17:37:11+00:00"
+            "time": "2019-10-21T16:45:58+00:00"
         },
         {
             "name": "gitonomy/gitlib",
-            "version": "v1.1.0",
+            "version": "v1.2.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/gitonomy/gitlib.git",
-                "reference": "49e599915eae04b734f31e6e88f773d32d921e2e"
+                "reference": "a0bea921266ad1c9626d712e7f8687dcc08ca528"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/gitonomy/gitlib/zipball/49e599915eae04b734f31e6e88f773d32d921e2e",
-                "reference": "49e599915eae04b734f31e6e88f773d32d921e2e",
+                "url": "https://api.github.com/repos/gitonomy/gitlib/zipball/a0bea921266ad1c9626d712e7f8687dcc08ca528",
+                "reference": "a0bea921266ad1c9626d712e7f8687dcc08ca528",
                 "shasum": ""
             },
             "require": {
                 "php": "^5.6 || ^7.0",
-                "symfony/process": "^3.4|^4.0"
+                "symfony/process": "^3.4|^4.0|^5.0"
             },
             "require-dev": {
-                "phpunit/phpunit": "^5.7|^6.5",
+                "phpunit/phpunit": "^5.7|^6.5|^7.0",
                 "psr/log": "^1.0"
             },
             "suggest": {
@@ -353,7 +354,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.1-dev"
+                    "dev-master": "1.2-dev"
                 }
             },
             "autoload": {
@@ -367,19 +368,25 @@
             ],
             "authors": [
                 {
-                    "name": "Alexandre Salomé",
-                    "email": "alexandre.salome@gmail.com",
-                    "homepage": "http://alexandre-salome.fr"
+                    "name": "Graham Campbell",
+                    "email": "graham@alt-three.com"
                 },
                 {
-                    "name": "Julien DIDIER",
-                    "email": "genzo.wm@gmail.com",
-                    "homepage": "http://www.jdidier.net"
+                    "name": "Julien Didier",
+                    "email": "genzo.wm@gmail.com"
+                },
+                {
+                    "name": "Grégoire Pineau",
+                    "email": "lyrixx@lyrixx.info"
+                },
+                {
+                    "name": "Alexandre Salomé",
+                    "email": "alexandre.salome@gmail.com"
                 }
             ],
             "description": "Library for accessing git",
             "homepage": "http://gitonomy.com",
-            "time": "2019-06-23T09:49:01+00:00"
+            "time": "2019-12-08T12:42:25+00:00"
         },
         {
             "name": "guzzle/guzzle",
@@ -476,16 +483,16 @@
         },
         {
             "name": "myclabs/deep-copy",
-            "version": "1.9.3",
+            "version": "1.9.5",
             "source": {
                 "type": "git",
                 "url": "https://github.com/myclabs/DeepCopy.git",
-                "reference": "007c053ae6f31bba39dfa19a7726f56e9763bbea"
+                "reference": "b2c28789e80a97badd14145fda39b545d83ca3ef"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/007c053ae6f31bba39dfa19a7726f56e9763bbea",
-                "reference": "007c053ae6f31bba39dfa19a7726f56e9763bbea",
+                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/b2c28789e80a97badd14145fda39b545d83ca3ef",
+                "reference": "b2c28789e80a97badd14145fda39b545d83ca3ef",
                 "shasum": ""
             },
             "require": {
@@ -520,7 +527,7 @@
                 "object",
                 "object graph"
             ],
-            "time": "2019-08-09T12:45:53+00:00"
+            "time": "2020-01-17T21:11:47+00:00"
         },
         {
             "name": "padraic/humbug_get_contents",
@@ -697,16 +704,16 @@
         },
         {
             "name": "phpdocumentor/reflection-docblock",
-            "version": "4.3.2",
+            "version": "4.3.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpDocumentor/ReflectionDocBlock.git",
-                "reference": "b83ff7cfcfee7827e1e78b637a5904fe6a96698e"
+                "reference": "da3fd972d6bafd628114f7e7e036f45944b62e9c"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpDocumentor/ReflectionDocBlock/zipball/b83ff7cfcfee7827e1e78b637a5904fe6a96698e",
-                "reference": "b83ff7cfcfee7827e1e78b637a5904fe6a96698e",
+                "url": "https://api.github.com/repos/phpDocumentor/ReflectionDocBlock/zipball/da3fd972d6bafd628114f7e7e036f45944b62e9c",
+                "reference": "da3fd972d6bafd628114f7e7e036f45944b62e9c",
                 "shasum": ""
             },
             "require": {
@@ -718,6 +725,7 @@
             "require-dev": {
                 "doctrine/instantiator": "^1.0.5",
                 "mockery/mockery": "^1.0",
+                "phpdocumentor/type-resolver": "0.4.*",
                 "phpunit/phpunit": "^6.4"
             },
             "type": "library",
@@ -744,7 +752,7 @@
                 }
             ],
             "description": "With this component, a library can provide support for annotations via DocBlocks or otherwise retrieve information that is embedded in a DocBlock.",
-            "time": "2019-09-12T14:27:41+00:00"
+            "time": "2019-12-28T18:55:12+00:00"
         },
         {
             "name": "phpdocumentor/type-resolver",
@@ -795,33 +803,33 @@
         },
         {
             "name": "phpspec/prophecy",
-            "version": "1.8.1",
+            "version": "v1.10.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpspec/prophecy.git",
-                "reference": "1927e75f4ed19131ec9bcc3b002e07fb1173ee76"
+                "reference": "b4400efc9d206e83138e2bb97ed7f5b14b831cd9"
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             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpspec/prophecy/zipball/1927e75f4ed19131ec9bcc3b002e07fb1173ee76",
-                "reference": "1927e75f4ed19131ec9bcc3b002e07fb1173ee76",
+                "url": "https://api.github.com/repos/phpspec/prophecy/zipball/b4400efc9d206e83138e2bb97ed7f5b14b831cd9",
+                "reference": "b4400efc9d206e83138e2bb97ed7f5b14b831cd9",
                 "shasum": ""
             },
             "require": {
                 "doctrine/instantiator": "^1.0.2",
                 "php": "^5.3|^7.0",
-                "phpdocumentor/reflection-docblock": "^2.0|^3.0.2|^4.0",
-                "sebastian/comparator": "^1.1|^2.0|^3.0",
-                "sebastian/recursion-context": "^1.0|^2.0|^3.0"
+                "phpdocumentor/reflection-docblock": "^2.0|^3.0.2|^4.0|^5.0",
+                "sebastian/comparator": "^1.2.3|^2.0|^3.0|^4.0",
+                "sebastian/recursion-context": "^1.0|^2.0|^3.0|^4.0"
             },
             "require-dev": {
-                "phpspec/phpspec": "^2.5|^3.2",
+                "phpspec/phpspec": "^2.5 || ^3.2",
                 "phpunit/phpunit": "^4.8.35 || ^5.7 || ^6.5 || ^7.1"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.8.x-dev"
+                    "dev-master": "1.10.x-dev"
                 }
             },
             "autoload": {
@@ -854,7 +862,7 @@
                 "spy",
                 "stub"
             ],
-            "time": "2019-06-13T12:50:23+00:00"
+            "time": "2020-01-20T15:57:02+00:00"
         },
         {
             "name": "phpunit/php-code-coverage",
@@ -1298,16 +1306,16 @@
         },
         {
             "name": "psr/log",
-            "version": "1.1.0",
+            "version": "1.1.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/php-fig/log.git",
-                "reference": "6c001f1daafa3a3ac1d8ff69ee4db8e799a654dd"
+                "reference": "446d54b4cb6bf489fc9d75f55843658e6f25d801"
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             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/php-fig/log/zipball/6c001f1daafa3a3ac1d8ff69ee4db8e799a654dd",
-                "reference": "6c001f1daafa3a3ac1d8ff69ee4db8e799a654dd",
+                "url": "https://api.github.com/repos/php-fig/log/zipball/446d54b4cb6bf489fc9d75f55843658e6f25d801",
+                "reference": "446d54b4cb6bf489fc9d75f55843658e6f25d801",
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             },
             "require": {
@@ -1316,7 +1324,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.0.x-dev"
+                    "dev-master": "1.1.x-dev"
                 }
             },
             "autoload": {
@@ -1341,7 +1349,7 @@
                 "psr",
                 "psr-3"
             ],
-            "time": "2018-11-20T15:27:04+00:00"
+            "time": "2019-11-01T11:05:21+00:00"
         },
         {
             "name": "satooshi/php-coveralls",
@@ -1920,32 +1928,32 @@
         },
         {
             "name": "symfony/config",
-            "version": "v4.3.4",
+            "version": "v4.4.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/config.git",
-                "reference": "07d49c0f823e0bc367c6d84e35b61419188a5ece"
+                "reference": "4d3979f54472637169080f802dc82197e21fdcce"
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-                "url": "https://api.github.com/repos/symfony/config/zipball/07d49c0f823e0bc367c6d84e35b61419188a5ece",
-                "reference": "07d49c0f823e0bc367c6d84e35b61419188a5ece",
+                "url": "https://api.github.com/repos/symfony/config/zipball/4d3979f54472637169080f802dc82197e21fdcce",
+                "reference": "4d3979f54472637169080f802dc82197e21fdcce",
                 "shasum": ""
             },
             "require": {
                 "php": "^7.1.3",
-                "symfony/filesystem": "~3.4|~4.0",
+                "symfony/filesystem": "^3.4|^4.0|^5.0",
                 "symfony/polyfill-ctype": "~1.8"
             },
             "conflict": {
                 "symfony/finder": "<3.4"
             },
             "require-dev": {
-                "symfony/dependency-injection": "~3.4|~4.0",
-                "symfony/event-dispatcher": "~3.4|~4.0",
-                "symfony/finder": "~3.4|~4.0",
-                "symfony/messenger": "~4.1",
-                "symfony/yaml": "~3.4|~4.0"
+                "symfony/event-dispatcher": "^3.4|^4.0|^5.0",
+                "symfony/finder": "^3.4|^4.0|^5.0",
+                "symfony/messenger": "^4.1|^5.0",
+                "symfony/service-contracts": "^1.1|^2",
+                "symfony/yaml": "^3.4|^4.0|^5.0"
             },
             "suggest": {
                 "symfony/yaml": "To use the yaml reference dumper"
@@ -1953,7 +1961,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "4.3-dev"
+                    "dev-master": "4.4-dev"
                 }
             },
             "autoload": {
@@ -1980,31 +1988,32 @@
             ],
             "description": "Symfony Config Component",
             "homepage": "https://symfony.com",
-            "time": "2019-08-26T08:26:39+00:00"
+            "time": "2020-01-04T13:00:46+00:00"
         },
         {
             "name": "symfony/console",
-            "version": "v4.3.4",
+            "version": "v4.4.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/console.git",
-                "reference": "de63799239b3881b8a08f8481b22348f77ed7b36"
+                "reference": "f512001679f37e6a042b51897ed24a2f05eba656"
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-                "reference": "de63799239b3881b8a08f8481b22348f77ed7b36",
+                "url": "https://api.github.com/repos/symfony/console/zipball/f512001679f37e6a042b51897ed24a2f05eba656",
+                "reference": "f512001679f37e6a042b51897ed24a2f05eba656",
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             "require": {
                 "php": "^7.1.3",
                 "symfony/polyfill-mbstring": "~1.0",
                 "symfony/polyfill-php73": "^1.8",
-                "symfony/service-contracts": "^1.1"
+                "symfony/service-contracts": "^1.1|^2"
             },
             "conflict": {
                 "symfony/dependency-injection": "<3.4",
-                "symfony/event-dispatcher": "<4.3",
+                "symfony/event-dispatcher": "<4.3|>=5",
+                "symfony/lock": "<4.4",
                 "symfony/process": "<3.3"
             },
             "provide": {
@@ -2012,12 +2021,12 @@
             },
             "require-dev": {
                 "psr/log": "~1.0",
-                "symfony/config": "~3.4|~4.0",
-                "symfony/dependency-injection": "~3.4|~4.0",
+                "symfony/config": "^3.4|^4.0|^5.0",
+                "symfony/dependency-injection": "^3.4|^4.0|^5.0",
                 "symfony/event-dispatcher": "^4.3",
-                "symfony/lock": "~3.4|~4.0",
-                "symfony/process": "~3.4|~4.0",
-                "symfony/var-dumper": "^4.3"
+                "symfony/lock": "^4.4|^5.0",
+                "symfony/process": "^3.4|^4.0|^5.0",
+                "symfony/var-dumper": "^4.3|^5.0"
             },
             "suggest": {
                 "psr/log": "For using the console logger",
@@ -2028,7 +2037,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "4.3-dev"
+                    "dev-master": "4.4-dev"
                 }
             },
             "autoload": {
@@ -2055,20 +2064,20 @@
             ],
             "description": "Symfony Console Component",
             "homepage": "https://symfony.com",
-            "time": "2019-08-26T08:26:39+00:00"
+            "time": "2020-01-25T12:44:29+00:00"
         },
         {
             "name": "symfony/event-dispatcher",
-            "version": "v4.3.4",
+            "version": "v4.4.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/event-dispatcher.git",
-                "reference": "429d0a1451d4c9c4abe1959b2986b88794b9b7d2"
+                "reference": "9e3de195e5bc301704dd6915df55892f6dfc208b"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/event-dispatcher/zipball/429d0a1451d4c9c4abe1959b2986b88794b9b7d2",
-                "reference": "429d0a1451d4c9c4abe1959b2986b88794b9b7d2",
+                "url": "https://api.github.com/repos/symfony/event-dispatcher/zipball/9e3de195e5bc301704dd6915df55892f6dfc208b",
+                "reference": "9e3de195e5bc301704dd6915df55892f6dfc208b",
                 "shasum": ""
             },
             "require": {
@@ -2084,12 +2093,12 @@
             },
             "require-dev": {
                 "psr/log": "~1.0",
-                "symfony/config": "~3.4|~4.0",
-                "symfony/dependency-injection": "~3.4|~4.0",
-                "symfony/expression-language": "~3.4|~4.0",
-                "symfony/http-foundation": "^3.4|^4.0",
-                "symfony/service-contracts": "^1.1",
-                "symfony/stopwatch": "~3.4|~4.0"
+                "symfony/config": "^3.4|^4.0|^5.0",
+                "symfony/dependency-injection": "^3.4|^4.0|^5.0",
+                "symfony/expression-language": "^3.4|^4.0|^5.0",
+                "symfony/http-foundation": "^3.4|^4.0|^5.0",
+                "symfony/service-contracts": "^1.1|^2",
+                "symfony/stopwatch": "^3.4|^4.0|^5.0"
             },
             "suggest": {
                 "symfony/dependency-injection": "",
@@ -2098,7 +2107,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "4.3-dev"
+                    "dev-master": "4.4-dev"
                 }
             },
             "autoload": {
@@ -2125,20 +2134,20 @@
             ],
             "description": "Symfony EventDispatcher Component",
             "homepage": "https://symfony.com",
-            "time": "2019-08-26T08:55:16+00:00"
+            "time": "2020-01-10T21:54:01+00:00"
         },
         {
             "name": "symfony/event-dispatcher-contracts",
-            "version": "v1.1.5",
+            "version": "v1.1.7",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/event-dispatcher-contracts.git",
-                "reference": "c61766f4440ca687de1084a5c00b08e167a2575c"
+                "reference": "c43ab685673fb6c8d84220c77897b1d6cdbe1d18"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/event-dispatcher-contracts/zipball/c61766f4440ca687de1084a5c00b08e167a2575c",
-                "reference": "c61766f4440ca687de1084a5c00b08e167a2575c",
+                "url": "https://api.github.com/repos/symfony/event-dispatcher-contracts/zipball/c43ab685673fb6c8d84220c77897b1d6cdbe1d18",
+                "reference": "c43ab685673fb6c8d84220c77897b1d6cdbe1d18",
                 "shasum": ""
             },
             "require": {
@@ -2183,30 +2192,30 @@
                 "interoperability",
                 "standards"
             ],
-            "time": "2019-06-20T06:46:26+00:00"
+            "time": "2019-09-17T09:54:03+00:00"
         },
         {
             "name": "symfony/filesystem",
-            "version": "v4.3.4",
+            "version": "v5.0.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/filesystem.git",
-                "reference": "9abbb7ef96a51f4d7e69627bc6f63307994e4263"
+                "reference": "3afadc0f57cd74f86379d073e694b0f2cda2a88c"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/filesystem/zipball/9abbb7ef96a51f4d7e69627bc6f63307994e4263",
-                "reference": "9abbb7ef96a51f4d7e69627bc6f63307994e4263",
+                "url": "https://api.github.com/repos/symfony/filesystem/zipball/3afadc0f57cd74f86379d073e694b0f2cda2a88c",
+                "reference": "3afadc0f57cd74f86379d073e694b0f2cda2a88c",
                 "shasum": ""
             },
             "require": {
-                "php": "^7.1.3",
+                "php": "^7.2.5",
                 "symfony/polyfill-ctype": "~1.8"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "4.3-dev"
+                    "dev-master": "5.0-dev"
                 }
             },
             "autoload": {
@@ -2233,20 +2242,20 @@
             ],
             "description": "Symfony Filesystem Component",
             "homepage": "https://symfony.com",
-            "time": "2019-08-20T14:07:54+00:00"
+            "time": "2020-01-21T08:40:24+00:00"
         },
         {
             "name": "symfony/polyfill-ctype",
-            "version": "v1.12.0",
+            "version": "v1.13.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/polyfill-ctype.git",
-                "reference": "550ebaac289296ce228a706d0867afc34687e3f4"
+                "reference": "f8f0b461be3385e56d6de3dbb5a0df24c0c275e3"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/polyfill-ctype/zipball/550ebaac289296ce228a706d0867afc34687e3f4",
-                "reference": "550ebaac289296ce228a706d0867afc34687e3f4",
+                "url": "https://api.github.com/repos/symfony/polyfill-ctype/zipball/f8f0b461be3385e56d6de3dbb5a0df24c0c275e3",
+                "reference": "f8f0b461be3385e56d6de3dbb5a0df24c0c275e3",
                 "shasum": ""
             },
             "require": {
@@ -2258,7 +2267,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.12-dev"
+                    "dev-master": "1.13-dev"
                 }
             },
             "autoload": {
@@ -2291,20 +2300,20 @@
                 "polyfill",
                 "portable"
             ],
-            "time": "2019-08-06T08:03:45+00:00"
+            "time": "2019-11-27T13:56:44+00:00"
         },
         {
             "name": "symfony/polyfill-mbstring",
-            "version": "v1.12.0",
+            "version": "v1.13.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/polyfill-mbstring.git",
-                "reference": "b42a2f66e8f1b15ccf25652c3424265923eb4f17"
+                "reference": "7b4aab9743c30be783b73de055d24a39cf4b954f"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/polyfill-mbstring/zipball/b42a2f66e8f1b15ccf25652c3424265923eb4f17",
-                "reference": "b42a2f66e8f1b15ccf25652c3424265923eb4f17",
+                "url": "https://api.github.com/repos/symfony/polyfill-mbstring/zipball/7b4aab9743c30be783b73de055d24a39cf4b954f",
+                "reference": "7b4aab9743c30be783b73de055d24a39cf4b954f",
                 "shasum": ""
             },
             "require": {
@@ -2316,7 +2325,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.12-dev"
+                    "dev-master": "1.13-dev"
                 }
             },
             "autoload": {
@@ -2350,20 +2359,20 @@
                 "portable",
                 "shim"
             ],
-            "time": "2019-08-06T08:03:45+00:00"
+            "time": "2019-11-27T14:18:11+00:00"
         },
         {
             "name": "symfony/polyfill-php73",
-            "version": "v1.12.0",
+            "version": "v1.13.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/polyfill-php73.git",
-                "reference": "2ceb49eaccb9352bff54d22570276bb75ba4a188"
+                "reference": "4b0e2222c55a25b4541305a053013d5647d3a25f"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/polyfill-php73/zipball/2ceb49eaccb9352bff54d22570276bb75ba4a188",
-                "reference": "2ceb49eaccb9352bff54d22570276bb75ba4a188",
+                "url": "https://api.github.com/repos/symfony/polyfill-php73/zipball/4b0e2222c55a25b4541305a053013d5647d3a25f",
+                "reference": "4b0e2222c55a25b4541305a053013d5647d3a25f",
                 "shasum": ""
             },
             "require": {
@@ -2372,7 +2381,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.12-dev"
+                    "dev-master": "1.13-dev"
                 }
             },
             "autoload": {
@@ -2408,29 +2417,29 @@
                 "portable",
                 "shim"
             ],
-            "time": "2019-08-06T08:03:45+00:00"
+            "time": "2019-11-27T16:25:15+00:00"
         },
         {
             "name": "symfony/process",
-            "version": "v4.3.4",
+            "version": "v5.0.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/process.git",
-                "reference": "e89969c00d762349f078db1128506f7f3dcc0d4a"
+                "reference": "f9ffd870f5ac01abec7b2b5e15f904ca9400ecd1"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/process/zipball/e89969c00d762349f078db1128506f7f3dcc0d4a",
-                "reference": "e89969c00d762349f078db1128506f7f3dcc0d4a",
+                "url": "https://api.github.com/repos/symfony/process/zipball/f9ffd870f5ac01abec7b2b5e15f904ca9400ecd1",
+                "reference": "f9ffd870f5ac01abec7b2b5e15f904ca9400ecd1",
                 "shasum": ""
             },
             "require": {
-                "php": "^7.1.3"
+                "php": "^7.2.5"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "4.3-dev"
+                    "dev-master": "5.0-dev"
                 }
             },
             "autoload": {
@@ -2457,24 +2466,24 @@
             ],
             "description": "Symfony Process Component",
             "homepage": "https://symfony.com",
-            "time": "2019-08-26T08:26:39+00:00"
+            "time": "2020-01-09T09:53:06+00:00"
         },
         {
             "name": "symfony/service-contracts",
-            "version": "v1.1.6",
+            "version": "v2.0.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/service-contracts.git",
-                "reference": "ea7263d6b6d5f798b56a45a5b8d686725f2719a3"
+                "reference": "144c5e51266b281231e947b51223ba14acf1a749"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/service-contracts/zipball/ea7263d6b6d5f798b56a45a5b8d686725f2719a3",
-                "reference": "ea7263d6b6d5f798b56a45a5b8d686725f2719a3",
+                "url": "https://api.github.com/repos/symfony/service-contracts/zipball/144c5e51266b281231e947b51223ba14acf1a749",
+                "reference": "144c5e51266b281231e947b51223ba14acf1a749",
                 "shasum": ""
             },
             "require": {
-                "php": "^7.1.3",
+                "php": "^7.2.5",
                 "psr/container": "^1.0"
             },
             "suggest": {
@@ -2483,7 +2492,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.1-dev"
+                    "dev-master": "2.0-dev"
                 }
             },
             "autoload": {
@@ -2515,30 +2524,30 @@
                 "interoperability",
                 "standards"
             ],
-            "time": "2019-08-20T14:44:19+00:00"
+            "time": "2019-11-18T17:27:11+00:00"
         },
         {
             "name": "symfony/stopwatch",
-            "version": "v4.3.4",
+            "version": "v4.4.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/stopwatch.git",
-                "reference": "1e4ff456bd625be5032fac9be4294e60442e9b71"
+                "reference": "abc08d7c48987829bac301347faa10f7e8bbf4fb"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/stopwatch/zipball/1e4ff456bd625be5032fac9be4294e60442e9b71",
-                "reference": "1e4ff456bd625be5032fac9be4294e60442e9b71",
+                "url": "https://api.github.com/repos/symfony/stopwatch/zipball/abc08d7c48987829bac301347faa10f7e8bbf4fb",
+                "reference": "abc08d7c48987829bac301347faa10f7e8bbf4fb",
                 "shasum": ""
             },
             "require": {
                 "php": "^7.1.3",
-                "symfony/service-contracts": "^1.0"
+                "symfony/service-contracts": "^1.0|^2"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "4.3-dev"
+                    "dev-master": "4.4-dev"
                 }
             },
             "autoload": {
@@ -2565,20 +2574,20 @@
             ],
             "description": "Symfony Stopwatch Component",
             "homepage": "https://symfony.com",
-            "time": "2019-08-07T11:52:19+00:00"
+            "time": "2020-01-04T13:00:46+00:00"
         },
         {
             "name": "symfony/yaml",
-            "version": "v4.3.4",
+            "version": "v4.4.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/yaml.git",
-                "reference": "5a0b7c32dc3ec56fd4abae8a4a71b0cf05013686"
+                "reference": "cd014e425b3668220adb865f53bff64b3ad21767"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/yaml/zipball/5a0b7c32dc3ec56fd4abae8a4a71b0cf05013686",
-                "reference": "5a0b7c32dc3ec56fd4abae8a4a71b0cf05013686",
+                "url": "https://api.github.com/repos/symfony/yaml/zipball/cd014e425b3668220adb865f53bff64b3ad21767",
+                "reference": "cd014e425b3668220adb865f53bff64b3ad21767",
                 "shasum": ""
             },
             "require": {
@@ -2589,7 +2598,7 @@
                 "symfony/console": "<3.4"
             },
             "require-dev": {
-                "symfony/console": "~3.4|~4.0"
+                "symfony/console": "^3.4|^4.0|^5.0"
             },
             "suggest": {
                 "symfony/console": "For validating YAML files using the lint command"
@@ -2597,7 +2606,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "4.3-dev"
+                    "dev-master": "4.4-dev"
                 }
             },
             "autoload": {
@@ -2624,35 +2633,33 @@
             ],
             "description": "Symfony Yaml Component",
             "homepage": "https://symfony.com",
-            "time": "2019-08-20T14:27:59+00:00"
+            "time": "2020-01-21T11:12:16+00:00"
         },
         {
             "name": "webmozart/assert",
-            "version": "1.5.0",
+            "version": "1.6.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/webmozart/assert.git",
-                "reference": "88e6d84706d09a236046d686bbea96f07b3a34f4"
+                "reference": "573381c0a64f155a0d9a23f4b0c797194805b925"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/webmozart/assert/zipball/88e6d84706d09a236046d686bbea96f07b3a34f4",
-                "reference": "88e6d84706d09a236046d686bbea96f07b3a34f4",
+                "url": "https://api.github.com/repos/webmozart/assert/zipball/573381c0a64f155a0d9a23f4b0c797194805b925",
+                "reference": "573381c0a64f155a0d9a23f4b0c797194805b925",
                 "shasum": ""
             },
             "require": {
                 "php": "^5.3.3 || ^7.0",
                 "symfony/polyfill-ctype": "^1.8"
             },
+            "conflict": {
+                "vimeo/psalm": "<3.6.0"
+            },
             "require-dev": {
                 "phpunit/phpunit": "^4.8.36 || ^7.5.13"
             },
             "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "1.3-dev"
-                }
-            },
             "autoload": {
                 "psr-4": {
                     "Webmozart\\Assert\\": "src/"
@@ -2674,7 +2681,7 @@
                 "check",
                 "validate"
             ],
-            "time": "2019-08-24T08:43:50+00:00"
+            "time": "2019-11-24T13:36:37+00:00"
         }
     ],
     "aliases": [],
@@ -2686,7 +2693,7 @@
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": {
-        "php": "^5.5.0 || ^7.0"
+        "php": "^5.6.0 || ^7.0"
     },
     "platform-dev": []
 }
diff --git a/lib/Controller.php b/lib/Controller.php
index a10ffb4..0a3e69c 100644
--- a/lib/Controller.php
+++ b/lib/Controller.php
@@ -35,7 +35,7 @@ class Controller
      *
      * @const string
      */
-    const MIN_PHP_VERSION = '5.5.0';
+    const MIN_PHP_VERSION = '5.6.0';
 
     /**
      * show the same error message if the paste expired or does not exist
@@ -276,9 +276,7 @@ class Controller
                 // accessing this method ensures that the paste would be
                 // deleted if it has already expired
                 $paste->get();
-                if (
-                    Filter::slowEquals($deletetoken, $paste->getDeleteToken())
-                ) {
+                if (hash_equals($paste->getDeleteToken(), $deletetoken)) {
                     // Paste exists and deletion token is valid: Delete the paste.
                     $paste->delete();
                     $this->_status = 'Paste was properly deleted.';
diff --git a/lib/Filter.php b/lib/Filter.php
index fd0e11e..cc4a6a2 100644
--- a/lib/Filter.php
+++ b/lib/Filter.php
@@ -68,23 +68,4 @@ class Filter
         }
         return number_format($size, ($i ? 2 : 0), '.', ' ') . ' ' . I18n::_($iec[$i]);
     }
-
-    /**
-     * fixed time string comparison operation to prevent timing attacks
-     * https://crackstation.net/hashing-security.htm?=rd#slowequals
-     *
-     * @access public
-     * @static
-     * @param  string $a
-     * @param  string $b
-     * @return bool
-     */
-    public static function slowEquals($a, $b)
-    {
-        $diff = strlen($a) ^ strlen($b);
-        for ($i = 0; $i < strlen($a) && $i < strlen($b); ++$i) {
-            $diff |= ord($a[$i]) ^ ord($b[$i]);
-        }
-        return $diff === 0;
-    }
 }
diff --git a/tst/FilterTest.php b/tst/FilterTest.php
index 96097a0..284802f 100644
--- a/tst/FilterTest.php
+++ b/tst/FilterTest.php
@@ -56,18 +56,4 @@ class FilterTest extends PHPUnit_Framework_TestCase
         $this->assertEquals('1.00 YiB', Filter::formatHumanReadableSize(1024 * $exponent));
         $this->assertEquals('1.21 YiB', Filter::formatHumanReadableSize(1234 * $exponent));
     }
-
-    public function testSlowEquals()
-    {
-        $this->assertTrue(Filter::slowEquals('foo', 'foo'), 'same string');
-        $this->assertFalse(Filter::slowEquals('foo', true), 'string and boolean');
-        $this->assertFalse(Filter::slowEquals('foo', 0), 'string and integer');
-        $this->assertFalse(Filter::slowEquals('123foo', 123), 'string and integer');
-        $this->assertFalse(Filter::slowEquals('123foo', '123'), 'different strings');
-        $this->assertFalse(Filter::slowEquals('6', ' 6'), 'strings with space');
-        $this->assertFalse(Filter::slowEquals('4.2', '4.20'), 'floats as strings');
-        $this->assertFalse(Filter::slowEquals('1e3', '1000'), 'integers as strings');
-        $this->assertFalse(Filter::slowEquals('9223372036854775807', '9223372036854775808'), 'large integers as strings');
-        $this->assertFalse(Filter::slowEquals('61529519452809720693702583126814', '61529519452809720000000000000000'), 'larger integers as strings');
-    }
 }
diff --git a/vendor/yzalis/identicon/src/Identicon/Generator/SvgGenerator.php b/vendor/yzalis/identicon/src/Identicon/Generator/SvgGenerator.php
index d654a95..7e753e8 100644
--- a/vendor/yzalis/identicon/src/Identicon/Generator/SvgGenerator.php
+++ b/vendor/yzalis/identicon/src/Identicon/Generator/SvgGenerator.php
@@ -46,25 +46,28 @@ class SvgGenerator extends BaseGenerator implements GeneratorInterface
         // prepare image
         $w = $this->getPixelRatio() * 5;
         $h = $this->getPixelRatio() * 5;
-        $svg = '<svg xmlns="http://www.w3.org/2000/svg" version="1.1" width="'.$w.'" height="'.$h.'">';
+        $svg = '<svg xmlns="http://www.w3.org/2000/svg" version="1.1" width="'.$w.'" height="'.$h.'" viewBox="0 0 5 5">';
 
-        $backgroundColor = '#FFFFFF';
+        $backgroundColor = '#FFF';
         $rgbBackgroundColor = $this->getBackgroundColor();
         if (!is_null($rgbBackgroundColor)) {
             $backgroundColor = $this->_toUnderstandableColor($rgbBackgroundColor);
         }
-        $svg .= '<rect width="'.$w.'" height="'.$h.'" style="fill:'.$backgroundColor.';stroke-width:1;stroke:'.$backgroundColor.'"/>';
 
-        $rgbColor = $this->_toUnderstandableColor($this->getColor());
+        $svg .= '<rect width="5" height="5" fill="'.$backgroundColor.'" stroke-width="0"/>';
+
+        $rects = [];
         // draw content
         foreach ($this->getArrayOfSquare() as $lineKey => $lineValue) {
             foreach ($lineValue as $colKey => $colValue) {
                 if (true === $colValue) {
-                    $svg .= '<rect x="'.$colKey * $this->getPixelRatio().'" y="'.$lineKey * $this->getPixelRatio().'" width="'.($this->getPixelRatio()).'" height="'.$this->getPixelRatio().'" style="fill:'.$rgbColor.';stroke-width:0;"/>';
+                    $rects[] = 'M'.$colKey.','.$lineKey.'h1v1h-1v-1';
                 }
             }
         }
 
+        $rgbColor = $this->_toUnderstandableColor($this->getColor());
+        $svg .= '<path fill="'.$rgbColor.'" stroke-width="0" d="' . implode('', $rects) . '"/>';
         $svg .= '</svg>';
 
         $this->generatedImage = $svg;
@@ -80,7 +83,7 @@ class SvgGenerator extends BaseGenerator implements GeneratorInterface
     protected function _toUnderstandableColor($color)
     {
         if (is_array($color)) {
-            return 'rgb('.implode(', ', $color).')';
+            return sprintf('#%X%X%X', $color[0], $color[1], $color[2]);
         }
 
         return $color;
diff --git a/vendor/yzalis/identicon/src/Identicon/Identicon.php b/vendor/yzalis/identicon/src/Identicon/Identicon.php
index 08d32f5..7a8e088 100644
--- a/vendor/yzalis/identicon/src/Identicon/Identicon.php
+++ b/vendor/yzalis/identicon/src/Identicon/Identicon.php
@@ -46,10 +46,10 @@ class Identicon
     /**
      * Display an Identicon image.
      *
-     * @param string $string
-     * @param int    $size
-     * @param string $color
-     * @param string $backgroundColor
+     * @param string       $string
+     * @param int          $size
+     * @param string|array $color
+     * @param string       $backgroundColor
      */
     public function displayImage($string, $size = 64, $color = null, $backgroundColor = null)
     {
@@ -60,10 +60,10 @@ class Identicon
     /**
      * Get an Identicon PNG image data.
      *
-     * @param string $string
-     * @param int    $size
-     * @param string $color
-     * @param string $backgroundColor
+     * @param string       $string
+     * @param int          $size
+     * @param string|array $color
+     * @param string       $backgroundColor
      *
      * @return string
      */
@@ -75,10 +75,10 @@ class Identicon
     /**
      * Get an Identicon PNG image resource.
      *
-     * @param string $string
-     * @param int    $size
-     * @param string $color
-     * @param string $backgroundColor
+     * @param string       $string
+     * @param int          $size
+     * @param string|array $color
+     * @param string       $backgroundColor
      *
      * @return string
      */
@@ -90,10 +90,10 @@ class Identicon
     /**
      * Get an Identicon PNG image data as base 64 encoded.
      *
-     * @param string $string
-     * @param int    $size
-     * @param string $color
-     * @param string $backgroundColor
+     * @param string       $string
+     * @param int          $size
+     * @param string|array $color
+     * @param string       $backgroundColor
      *
      * @return string
      */
@@ -101,13 +101,13 @@ class Identicon
     {
         return sprintf('data:%s;base64,%s', $this->generator->getMimeType(), base64_encode($this->getImageData($string, $size, $color, $backgroundColor)));
     }
-	
+
 	/**
 	 * Get the color of the Identicon
      *
      * Returns an array with RGB values of the Identicon's color. Colors may be NULL if no image has been generated
      * so far (e.g., when calling the method on a new Identicon()).
-	 * 
+	 *
 	 * @return array
 	 */
 	public function getColor()