diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 2dce6a9..4947f31 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -75,6 +75,7 @@ jobs:
 
       - name: Cleanup pre-releases
         uses: actions/github-script@v7.0.1
+        if: ${{ github.event.pull_request.merged == true }}
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
           script: |+
@@ -101,6 +102,7 @@ jobs:
             console.log('end run')
 
       - name: Split archive file.
+        if: ${{ github.event.pull_request.merged == true }}
         run: |+
           set -eux
 
@@ -113,6 +115,7 @@ jobs:
 
       - name: Pre-Release
         uses: softprops/action-gh-release@v2
+        if: ${{ github.event.pull_request.merged == true }}
         with:
           name: devtool-WSL2 image ${{ env.COMMIT_SHORT_SHA }}
           tag_name: ${{ env.COMMIT_SHORT_SHA }}