diff --git a/util/mirror-tarballs b/util/mirror-tarballs
index 6f99089..0391084 100755
--- a/util/mirror-tarballs
+++ b/util/mirror-tarballs
@@ -454,7 +454,7 @@ mv openresty-xss-nginx-module-* xss-nginx-module-$ver || exit 1
 
 #################################
 
-ver=0.3.0
+ver=0.3.1rc1
 $root/util/get-tarball "https://github.com/simplresty/ngx_devel_kit/tarball/v$ver" -O ngx_devel_kit-$ver.tar.gz
 tar -xzf ngx_devel_kit-$ver.tar.gz || exit 1
 mv simplresty-ngx_devel_kit-* ngx_devel_kit-$ver || exit 1