diff --git a/src/version.h b/src/version.h
index 09f728a273..5342632f12 100644
--- a/src/version.h
+++ b/src/version.h
@@ -1 +1 @@
-#define LAMMPS_VERSION "2 Apr 2011"
+#define LAMMPS_VERSION "4 Apr 2011"