diff --git a/src/common/Version.hxx b/src/common/Version.hxx
index b7aefa58e..bc58a857e 100644
--- a/src/common/Version.hxx
+++ b/src/common/Version.hxx
@@ -18,7 +18,7 @@
 #ifndef VERSION_HXX
 #define VERSION_HXX
 
-#define STELLA_VERSION "6.5.3"
+#define STELLA_VERSION "6.6_pre"
 #define STELLA_BUILD "6775"
 
 #endif