diff --git a/.github/workflows/binder.yml b/.github/workflows/binder.yml
index 232ad2a..6d24512 100644
--- a/.github/workflows/binder.yml
+++ b/.github/workflows/binder.yml
@@ -4,13 +4,15 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-
-    - name: checkout files in repo
-      uses: actions/checkout@master
+    - name: Checkout Code
+      uses: actions/checkout@v2
+      with:
+        ref: ${{ github.event.pull_request.head.sha }}
 
     - name: update jupyter dependencies with repo2docker
-      uses: jupyterhub/repo2docker-action@0.2
+      uses: jupyterhub/repo2docker-action@master
       with:
         DOCKER_USERNAME: ${{ secrets.DOCKER_USERNAME }}
         DOCKER_PASSWORD: ${{ secrets.DOCKER_PASSWORD }}
-        MYBINDERORG_CACHE: true
+        BINDER_CACHE: true
+        PUBLIC_REGISTRY_CHECK: true