diff --git a/metadata.json b/metadata.json
index fc7b905e..b465e876 100644
--- a/metadata.json
+++ b/metadata.json
@@ -1,6 +1,6 @@
 {
   "name": "puppet-postfix",
-  "version": "4.5.0",
+  "version": "4.5.1-rc0",
   "author": "Vox Pupuli",
   "summary": "Postfix Module",
   "license": "Apache-2.0",