diff --git a/src/index.ts b/src/index.ts
index 943f7e8..3d2c3f3 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -104,6 +104,7 @@ app.post('/ev/readyToMerge', async (c) => {
         pull_number: body.issue.number,
         owner: body.repository.owner.login,
         repo: body.repository.name,
+        merge_method: 'squash',
       })
       break;
   }