diff --git a/expat/cmake/autotools/expat.cmake b/expat/cmake/autotools/expat.cmake
index 24b5d92e..e97ad386 100644
--- a/expat/cmake/autotools/expat.cmake
+++ b/expat/cmake/autotools/expat.cmake
@@ -4,7 +4,7 @@ if("${CMAKE_MAJOR_VERSION}.${CMAKE_MINOR_VERSION}" LESS 2.6)
    message(FATAL_ERROR "CMake >= 2.6.0 required")
 endif()
 cmake_policy(PUSH)
-cmake_policy(VERSION 2.6...3.20)
+cmake_policy(VERSION 2.6...3.21)
 #----------------------------------------------------------------
 # Generated CMake target import file.
 #----------------------------------------------------------------