diff --git a/.github/workflows/on-master-push.yml b/.github/workflows/on-master-push.yml
index df38f69..22824e9 100644
--- a/.github/workflows/on-master-push.yml
+++ b/.github/workflows/on-master-push.yml
@@ -13,8 +13,8 @@ jobs:
     name: Build and push Docker image
     runs-on: ubuntu-18.04
     env:
-      TOR_VERSION: 0.4.6.8
-      TOR_CHECKSUM: @sha256:c262923ffd0bd224a4a4123cf1c88eea11e2314566b7b7e8a1f77969deeb0208
+      TOR_VERSION: "0.4.6.8"
+      TOR_CHECKSUM: "@sha256:c262923ffd0bd224a4a4123cf1c88eea11e2314566b7b7e8a1f77969deeb0208"
     steps:
       - name: Login to Docker Hub
         run: echo "${{ secrets.DOCKER_PASSWORD }}" | docker login -u "${{ secrets.DOCKER_USERNAME }}" --password-stdin