diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2f1163b..ef7c232 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required ( VERSION 2.8 )
+cmake_minimum_required ( VERSION 2.8...3.21 )
 
 project ( ParamKit )
 
diff --git a/demo/CMakeLists.txt b/demo/CMakeLists.txt
index d2296d4..5bbc84b 100644
--- a/demo/CMakeLists.txt
+++ b/demo/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required (VERSION 2.8)
+cmake_minimum_required ( VERSION 2.8...3.21 )
 project (demo)
 
 set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /MT")
diff --git a/paramkit/CMakeLists.txt b/paramkit/CMakeLists.txt
index 3f34bf7..0f27913 100644
--- a/paramkit/CMakeLists.txt
+++ b/paramkit/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required ( VERSION 2.8 )
+cmake_minimum_required ( VERSION 2.8...3.21 )
 project ( paramkit )
 
 set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /MT")