diff --git a/.github/workflows/explorer.yml b/.github/workflows/explorer.yml
index 3483bc08ec..4867464bc5 100644
--- a/.github/workflows/explorer.yml
+++ b/.github/workflows/explorer.yml
@@ -19,6 +19,8 @@ jobs:
 
     steps:
       - uses: actions/checkout@v2
+        with:
+          ref: ${{ github.event.pull_request.head.sha }}
       - uses: actions/setup-node@v2
         with:
           # "node" (v16) is not supported by node-sass yet