diff --git a/src/version.h b/src/version.h
index 110bee8220..f4b18f32dc 100644
--- a/src/version.h
+++ b/src/version.h
@@ -1 +1 @@
-#define LAMMPS_VERSION "19 May 2011"
+#define LAMMPS_VERSION "20 May 2011"