diff --git a/.github/workflows/pull-request.yml b/.github/workflows/pull-request.yml
index e93616cb..af51c780 100644
--- a/.github/workflows/pull-request.yml
+++ b/.github/workflows/pull-request.yml
@@ -14,6 +14,8 @@ jobs:
 
       - name: Setup pnpm
         uses: pnpm/action-setup@v4
+        with:
+          version: 9
 
       - name: Use Node.js
         uses: actions/setup-node@v4