diff --git a/CMakeLists.txt b/CMakeLists.txt
index 247971e..92cf177 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,4 +1,4 @@
-CMAKE_MINIMUM_REQUIRED(VERSION 2.8)
+CMAKE_MINIMUM_REQUIRED(VERSION 3.5...4.0)
 
 PROJECT(smtpping)
 SET(TARGET_NAME "smtpping")