diff --git a/src/version.h b/src/version.h
index 11971272da..42424dfe77 100644
--- a/src/version.h
+++ b/src/version.h
@@ -1 +1 @@
-#define LAMMPS_VERSION "30 May 2013"
+#define LAMMPS_VERSION "31 May 2013"