diff --git a/.github/workflows/build-and-deploy.yml b/.github/workflows/build-and-deploy.yml
index 88bd4543..af1b03ff 100644
--- a/.github/workflows/build-and-deploy.yml
+++ b/.github/workflows/build-and-deploy.yml
@@ -20,7 +20,7 @@ jobs:
 
 
       # Create a slugified value of the branch
-      - uses: rlespinasse/github-slug-action@master
+      - uses: rlespinasse/github-slug-action@2.0.0
 
       - name: "Build and push front image"
         uses: docker/build-push-action@v1
@@ -30,7 +30,7 @@ jobs:
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}
           repository: thecodingmachine/workadventure-front
-          tags: ${{ env.GITHUB_REF_SLUG }}
+          tags: ${{ env.GITHUB_REF_SLUG_URL }}
           add_git_labels: true
 
   build-back:
@@ -43,7 +43,7 @@ jobs:
         uses: actions/checkout@v2
 
       # Create a slugified value of the branch
-      - uses: rlespinasse/github-slug-action@master
+      - uses: rlespinasse/github-slug-action@2.0.0
 
       - name: "Build and push back image"
         uses: docker/build-push-action@v1
@@ -53,7 +53,7 @@ jobs:
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}
           repository: thecodingmachine/workadventure-back
-          tags: ${{ env.GITHUB_REF_SLUG }}
+          tags: ${{ env.GITHUB_REF_SLUG_URL }}
           add_git_labels: true
 
   deeploy:
@@ -74,24 +74,24 @@ jobs:
         env:
           KUBE_CONFIG_FILE: ${{ secrets.KUBE_CONFIG_FILE }}
         with:
-          namespace: workadventure-${{ env.GITHUB_REF_SLUG }}
+          namespace: workadventure-${{ env.GITHUB_REF_SLUG_URL }}
 
       - name: Add a comment in PR
         uses: unsplash/comment-on-pr@v1.2.0
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         with:
-          msg: Environment deployed at https://${{ env.GITHUB_REF_SLUG }}.workadventure.test.thecodingmachine.com
+          msg: Environment deployed at https://${{ env.GITHUB_REF_SLUG_URL }}.workadventure.test.thecodingmachine.com
           check_for_duplicate_msg: true
 
       - name: Run Cypress tests
         uses: cypress-io/github-action@v1
         env:
-          CYPRESS_BASE_URL: https://${{ env.GITHUB_REF_SLUG }}.workadventure.test.thecodingmachine.com
+          CYPRESS_BASE_URL: https://${{ env.GITHUB_REF_SLUG_URL }}.workadventure.test.thecodingmachine.com
         with:
-          env: host=${{ env.GITHUB_REF_SLUG }}.workadventure.test.thecodingmachine.com,port=80
+          env: host=${{ env.GITHUB_REF_SLUG_URL }}.workadventure.test.thecodingmachine.com,port=80
           spec: cypress/integration/spec.js
-          wait-on: https://${{ env.GITHUB_REF_SLUG }}.workadventure.test.thecodingmachine.com
+          wait-on: https://${{ env.GITHUB_REF_SLUG_URL }}.workadventure.test.thecodingmachine.com
           working-directory: e2e
 
       - name: "Upload the screenshot on test failure"
diff --git a/deeployer.libsonnet b/deeployer.libsonnet
index 84ea3eca..47508b2f 100644
--- a/deeployer.libsonnet
+++ b/deeployer.libsonnet
@@ -1,7 +1,7 @@
 {
   local env = std.extVar("env"),
-  local namespace = env.GITHUB_REF_SLUG,
-  local tag = if namespace == "master" then "latest" else namespace,
+  local namespace = env.GITHUB_REF_SLUG_URL,
+  local tag = namespace,
   "$schema": "https://raw.githubusercontent.com/thecodingmachine/deeployer/master/deeployer.schema.json",
   "containers": {
      "back": {