diff --git a/src/common/header/common.h b/src/common/header/common.h
index f4c930dd..f12de4f8 100644
--- a/src/common/header/common.h
+++ b/src/common/header/common.h
@@ -33,7 +33,7 @@
 #include "crc.h"
 
 /* Should have 4 characters. */
-#define YQ2VERSION "5.30"
+#define YQ2VERSION "5.31"
 
 #define BASEDIRNAME "baseq2"