diff --git a/configure.in b/configure.in
index 1be517688..3557942ae 100644
--- a/configure.in
+++ b/configure.in
@@ -1,5 +1,5 @@
 AC_INIT(src/zm.h)
-AM_INIT_AUTOMAKE(zm,1.21.0)
+AM_INIT_AUTOMAKE(zm,1.21.1)
 AM_CONFIG_HEADER(config.h)
 
 PATH_BUILD=`pwd`