diff --git a/CMakeL10n.txt b/CMakeL10n.txt
index 005793034..01d8e094d 100644
--- a/CMakeL10n.txt
+++ b/CMakeL10n.txt
@@ -9,7 +9,7 @@
 #
 #################################################
 
-cmake_minimum_required( VERSION 3.1 )
+cmake_minimum_required( VERSION 3.5 )
 
 
 ##### include our cmake modules #################
diff --git a/CMakeLists.txt b/CMakeLists.txt
index cd431dfda..7226a1359 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -9,7 +9,7 @@
 #
 #################################################
 
-cmake_minimum_required( VERSION 3.1 )
+cmake_minimum_required( VERSION 3.5 )
 
 
 ##### general package setup #####################
diff --git a/tdemarkdown/md4c/CMakeLists.txt b/tdemarkdown/md4c/CMakeLists.txt
index cab797eb9..df4657473 100644
--- a/tdemarkdown/md4c/CMakeLists.txt
+++ b/tdemarkdown/md4c/CMakeLists.txt
@@ -1,5 +1,5 @@
 
-cmake_minimum_required(VERSION 3.4)
+cmake_minimum_required( VERSION 3.5 )
 project(MD4C C)
 
 set(MD_VERSION_MAJOR 0)