diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index e7d6c762b..0dfd0d488 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -13,8 +13,7 @@ jobs:
         id: meta
         uses: crazy-max/ghaction-docker-meta@v2
         with:
-          images: |
-            'gcr.io/up9-docker-hub/mizu/${GITHUB_REF##*/}'
+          images: 'gcr.io/up9-docker-hub/mizu/${GITHUB_REF##*/}'
           tags: |
             type=sha
             type=raw,${{GITHUB_SHA}}