diff --git a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -111,8 +111,8 @@ endif()
 
 # version number
 set(MAJOR_VERSION 0 CACHE INT "Program major version number.")
-set(MINOR_VERSION 5 CACHE INT "Program minor version number.")
-set(PATCH_VERSION 1 CACHE INT "Program patch version number.")
+set(MINOR_VERSION 6 CACHE INT "Program minor version number.")
+set(PATCH_VERSION 0 CACHE INT "Program patch version number.")
 set(VERSION_STRING "${MAJOR_VERSION}.${MINOR_VERSION}.${PATCH_VERSION}")
 
 # get revision number from mercurial