diff --git a/CMakeLists.txt b/CMakeLists.txt
index 88cb23129e..3b673708a3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,13 +1,9 @@
 if(${CMAKE_VERSION} VERSION_GREATER_EQUAL "4.0")
-    set(CMAKE_POLICY_VERSION_MINIMUM 3.5 CACHE STRING "" FORCE)
+    set(CMAKE_POLICY_VERSION_MINIMUM 3.13 CACHE STRING "" FORCE)
 endif()
 
 cmake_minimum_required(VERSION 3.13)
 
-# Verify that your CMake version is exactly 3.5 series or higher on windows
-if ( (MSVC OR WIN32) AND (${CMAKE_VERSION} VERSION_LESS "3.5") )
-    message(FATAL_ERROR "CMake current version ${CMAKE_VERSION} is too old. Minimum required is 3.5.")
-endif()
 
 # The following line used to be in tests/CMakeLists.txt
 # Having it there causes rebuilds of all targets on any CMakeLists.txt change under tests/
@@ -377,11 +373,6 @@ endif ()
 if (CMAKE_SYSTEM_NAME STREQUAL "Linux")
     find_package(PkgConfig REQUIRED)
 
-    if (CMAKE_VERSION VERSION_LESS "3.1")
-        # Workaround for an old CMake, which does not understand CMAKE_CXX_STANDARD.
-        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
-    endif()
-
     # Boost on Raspberry-Pi does not link to pthreads.
     set(THREADS_PREFER_PTHREAD_FLAG ON)
     find_package(Threads REQUIRED)