diff --git a/.circleci/config.yml b/.circleci/config.yml
index ed9db7c001..f8e0affb0b 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -163,7 +163,7 @@ workflows:
       - build:
           filters:
             tags:
-              only: /(helm-)?[0-9]+(\.[0-9]+)*(-[a-z]+)?/
+              only: /(helm-)?[0-9]+(\.[0-9]+)*(-[a-z0-9]+)?/
 
   release-helm:
     jobs: