diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8074af5d..af9173a6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -29,7 +29,7 @@ project(${project_name})
 # Project version
 set (COOLPROP_VERSION_MAJOR 5)
 set (COOLPROP_VERSION_MINOR 0)
-set (COOLPROP_VERSION_PATCH 6)
+set (COOLPROP_VERSION_PATCH 7dev)
 set (COOLPROP_VERSION ${COOLPROP_VERSION_MAJOR}.${COOLPROP_VERSION_MINOR}.${COOLPROP_VERSION_PATCH})
 
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