diff --git a/.github/workflows/push.yml b/.github/workflows/push.yml
index 0c49856..02f3b90 100644
--- a/.github/workflows/push.yml
+++ b/.github/workflows/push.yml
@@ -42,6 +42,8 @@ jobs:
       - run: ./make_release.sh ${{ secrets.GITHUB_TOKEN }}
 
       # Docker image
+      - run: echo "RELEASE_NUM=$(./release_num.sh)" >> $GITHUB_ENV
+      - run: echo ${{ env.RELEASE_NUM }}
       - uses: docker/build-push-action@v1
         with:
           username: ${{ secrets.DOCKER_HUB_USER }}
@@ -49,5 +51,3 @@ jobs:
           repository: ${{ env.GITHUB_REPOSITORY }}
           tags: latest,r${{ env.RELEASE_NUM }}
           build_args: RELEASE_NUM=${{ env.RELEASE_NUM }}
-        env:
-          RELEASE_NUM: ${{ $(./release_num.sh) }}