diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0a483d9448..a68751da64 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,5 +1,5 @@
 project(KWIN)
-set(PROJECT_VERSION "5.9.0")
+set(PROJECT_VERSION "5.9.1")
 set(PROJECT_VERSION_MAJOR 5)
 
 cmake_minimum_required(VERSION 2.8.12 FATAL_ERROR)