--- a/source/CMakeLists.txt
+++ b/source/CMakeLists.txt
@@ -1,10 +1,4 @@
-# vim: syntax=cmake
-if(NOT CMAKE_BUILD_TYPE)
-    # default to Release build for GCC builds
-    set(CMAKE_BUILD_TYPE Release CACHE STRING
-        "Choose the type of build, options are: None(CMAKE_CXX_FLAGS or CMAKE_C_FLAGS used) Debug Release RelWithDebInfo MinSizeRel."
-        FORCE)
-endif()
+cmake_minimum_required(VERSION 3.1)
 message(STATUS "cmake version ${CMAKE_VERSION}")
 if(POLICY CMP0025)
     cmake_policy(SET CMP0025 OLD) # report Apple's Clang as just Clang
@@ -17,7 +11,6 @@ if(POLICY CMP0054)
 endif()
 
 project (x265)
-cmake_minimum_required (VERSION 2.8.8) # OBJECT libraries require 2.8.8
 include(CheckIncludeFiles)
 include(CheckFunctionExists)
 include(CheckSymbolExists)