diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4be3d23ea..b8911645a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -116,7 +116,7 @@ set( _tx_bad be eo fa fr_CH gu kk kn lo mk ne_NP ur uz )
 ### Required versions
 #
 # See DEPENDENCIES section below.
-set( QT_VERSION 5.10.0 )
+set( QT_VERSION 5.9.0 )
 set( YAMLCPP_VERSION 0.5.1 )
 set( ECM_VERSION 5.18 )
 set( PYTHONLIBS_VERSION 3.3 )