diff --git a/.travis.yml b/.travis.yml
index c5e0d07..3ad463c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,7 +9,7 @@ before_script:
   - composer install -n
 
 script:
-  - cd tst && phpunit
+  - cd tst && ../vendor/bin/phpunit
 
 after_script:
   - cd ..
diff --git a/composer.json b/composer.json
index b92f462..632bf2b 100644
--- a/composer.json
+++ b/composer.json
@@ -24,7 +24,8 @@
     },
     "require-dev": {
         "codacy/coverage": "dev-master",
-        "codeclimate/php-test-reporter": "dev-master"
+        "codeclimate/php-test-reporter": "dev-master",
+        "phpunit/phpunit": "^4.6 || ^5.0"
     },
     "autoload": {
         "psr-4": {