diff --git a/CMakeLists.txt b/CMakeLists.txt
index 71387f3..8c4e547 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -3,7 +3,7 @@
 
 project(qatsh)
 
-cmake_minimum_required(VERSION 2.8)
+cmake_minimum_required(VERSION 3.13.5)
 
 # CMake Build options.
 if(NOT DEFINED CMAKE_BUILD_TYPE)
diff --git a/cmake/FindLibSndFile.cmake b/cmake/FindLibSndFile.cmake
index 817db79..69eb11b 100644
--- a/cmake/FindLibSndFile.cmake
+++ b/cmake/FindLibSndFile.cmake
@@ -23,8 +23,8 @@ FIND_PATH(LIBSNDFILE_INCLUDE_DIR
             /opt/local # DarwinPorts
             /opt/csw # Blastwave
             /opt
-            "$ENV{ProgramFiles}\\libsndfile" "$ENV{ProgramFiles(x86)}\\libsndfile"
-            "$ENV{ProgramFiles}\\Mega-Nerd\\libsndfile" "$ENV{ProgramFiles(x86)}\\Mega-Nerd\\libsndfile")
+            "$ENV{ProgramFiles}\\libsndfile" "$ENV{ProgramFiles\(x86\)}\\libsndfile"
+            "$ENV{ProgramFiles}\\Mega-Nerd\\libsndfile" "$ENV{ProgramFiles\(x86\)}\\Mega-Nerd\\libsndfile")
 
 #MESSAGE(STATUS "LIBSNDFILE_INCLUDE_DIR=${LIBSNDFILE_INCLUDE_DIR}")
 
@@ -44,8 +44,8 @@ FIND_LIBRARY(LIBSNDFILE_LIBRARY
                /opt/local  # DarwinPorts
                /opt/csw  # Blastwave
                /opt
-               "$ENV{ProgramFiles}\\libsndfile" "$ENV{ProgramFiles(x86)}\\libsndfile"
-               "$ENV{ProgramFiles}\\Mega-Nerd\\libsndfile" "$ENV{ProgramFiles(x86)}\\Mega-Nerd\\libsndfile")
+               "$ENV{ProgramFiles}\\libsndfile" "$ENV{ProgramFiles\(x86\)}\\libsndfile"
+               "$ENV{ProgramFiles}\\Mega-Nerd\\libsndfile" "$ENV{ProgramFiles\(x86\)}\\Mega-Nerd\\libsndfile")
 
 #MESSAGE(STATUS "LIBSNDFILE_LIBRARY=${LIBSNDFILE_LIBRARY}")
 
diff --git a/qatsh/CMakeLists.txt b/qatsh/CMakeLists.txt
index 27090d1..627be0f 100644
--- a/qatsh/CMakeLists.txt
+++ b/qatsh/CMakeLists.txt
@@ -18,7 +18,7 @@ if(NOT QT4_FOUND)
   SET(OPTION_QT5 On)
 endif()
 if(OPTION_QT5)
-  cmake_minimum_required(VERSION 2.8.8)
+  cmake_minimum_required(VERSION 3.13.5)
 endif()
 
 if(OPTION_QT5)