diff --git a/CMakeLists.txt b/CMakeLists.txt
index ffa41494..b6c5e7cf 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -9,7 +9,7 @@
 #
 #################################################
 
-cmake_minimum_required( VERSION 2.6 )
+cmake_minimum_required( VERSION 3.1 )
 
 
 ##### general package setup #####################