diff --git a/CMakeLists.txt b/CMakeLists.txt
index 828a5ed2c..212aad653 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -41,7 +41,7 @@ endif()
 
 ################# now find all used packages #################
 
-set (REQUIRED_QT_VERSION 5.8.0)
+set (REQUIRED_QT_VERSION 5.9.0)
 
 find_package(Qt5 ${REQUIRED_QT_VERSION} REQUIRED NO_MODULE COMPONENTS Quick Gui Sql Qml Svg QuickControls2)