diff --git a/.github/workflows/delete-merged-branch.yml b/.github/workflows/delete-merged-branch.yml
new file mode 100644
index 0000000..96181c1
--- /dev/null
+++ b/.github/workflows/delete-merged-branch.yml
@@ -0,0 +1,23 @@
+name: Delete merged branch
+
+on:
+  pull_request:
+    types:
+      - closed
+
+jobs:
+  delete-branch:
+    if: github.event.pull_request.merged == true && github.event.pull_request.base.ref == 'main'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Delete merged branch
+        run: |
+          branch="${{ github.event.pull_request.head.ref }}"
+          repo="${{ github.repository }}"
+          token="${{ secrets.GITHUB_TOKEN }}"
+          if [[ "$branch" != "main" && "$branch" != "master" ]]; then
+            curl -s -X DELETE \
+              -H "Authorization: Bearer $token" \
+              -H "Accept: application/vnd.github+json" \
+              "https://api.github.com/repos/$repo/git/refs/heads/$branch"
+          fi