diff --git a/src/common/header/common.h b/src/common/header/common.h
index daf30b48..988c040f 100644
--- a/src/common/header/common.h
+++ b/src/common/header/common.h
@@ -32,7 +32,7 @@
 #include "shared.h"
 #include "crc.h"
 
-#define YQ2VERSION "8.30"
+#define YQ2VERSION "8.31pre"
 #define BASEDIRNAME "baseq2"
 
 #ifndef YQ2OSTYPE