--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,7 +1,7 @@
 # Keystone Assembler Engine (www.keystone-engine.org)
 # By Nguyen Anh Quynh, 2016
 
-cmake_minimum_required(VERSION 2.8.7)
+cmake_minimum_required(VERSION 3.5)
 project(keystone)
 
 set(KEYSTONE_VERSION_MAJOR 0)
@@ -24,7 +24,7 @@ if (POLICY CMP0051)
   # stripped everywhere that access the SOURCES property, so we just
   # defer to the OLD behavior of not including generator expressions
   # in the output for now.
-  cmake_policy(SET CMP0051 OLD)
+  # cmake_policy(SET CMP0051 OLD)
 endif()
 
 if (POLICY CMP0063)
--- a/llvm/CMakeLists.txt
+++ b/llvm/CMakeLists.txt
@@ -1,6 +1,6 @@
 # See docs/CMake.html for instructions about how to build LLVM with CMake.
 
-cmake_minimum_required(VERSION 2.8.7)
+cmake_minimum_required(VERSION 3.5)
 
 set(LLVM_INSTALL_TOOLCHAIN_ONLY ON)
 
@@ -19,7 +19,7 @@ if (POLICY CMP0051)
   # stripped everywhere that access the SOURCES property, so we just
   # defer to the OLD behavior of not including generator expressions
   # in the output for now.
-  cmake_policy(SET CMP0051 OLD)
+  # cmake_policy(SET CMP0051 OLD)
 endif()
 
 if(CMAKE_VERSION VERSION_LESS 3.1.20141117)