diff --git a/.github/workflows/docker_build.yaml b/.github/workflows/docker_build.yaml
deleted file mode 100644
index e153503..0000000
--- a/.github/workflows/docker_build.yaml
+++ /dev/null
@@ -1,67 +0,0 @@
-name: Build docker image with the presentation
-
-on:
-  push:
-    branches: [main]
-  workflow_dispatch:
-    inputs:
-      reason:
-        description: Why did you need to rebuild the image?
-        required: False
-        default: Image built from master was outdated
-
-
-jobs:
-  docker_build:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout repo
-        uses: actions/checkout@v2.3.1
-        with:
-          fetch-depth: 0
-          lfs: true
-          persist-credentials: false
-      # lfs=true is not enough, see https://stackoverflow.com/questions/61463578/github-actions-actions-checkoutv2-lfs-true-flag-not-converting-pointers-to-act
-      - name: Pull LFS Objects
-        run: git lfs pull
-      - name: validate notebooks
-        run: |
-          for notebook in notebooks/*.ipynb; do
-            if grep -q '# *%load ' "$notebook"; then
-              echo "$notebook contains an executed load statement. 
-          This is not allowed inside the docker image for participants, make sure you remove this
-          in a future commit."
-              exit 255
-            fi
-          done
-      - name: Set up QEMU
-        uses: docker/setup-qemu-action@v1
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v1
-      - name: Login to GAR
-        uses: docker/login-action@v1
-        with:
-          registry: europe-west3-docker.pkg.dev
-          username: _json_key
-          password: ${{ secrets.GAR_JSON_KEY }}
-      - name: Docker meta
-        id: meta
-        uses: docker/metadata-action@v3
-        with:
-          flavor: |
-            latest=true
-          images: europe-west3-docker.pkg.dev/tfl-prod-ea3b/tfl-docker/tfl-training-probabilistic-model-checking
-          tags: |
-            type=sha
-      - name: Build and push
-        uses: docker/build-push-action@v4
-        with:
-          context: .
-          no-cache: true
-          push: true
-          tags: ${{ steps.meta.outputs.tags }}
-          labels: ${{ steps.meta.outputs.labels }}
-          build-args:
-            PARTICIPANT_BUCKET_READ_SECRET=${{ secrets.PARTICIPANT_BUCKET_READ_SECRET }}
-          cache-from: type=registry,ref=europe-west3-docker.pkg.dev/tfl-prod-ea3b/tfl-docker/tfl-training-probabilistic-model-checking:latest
-          cache-to: type=inline
diff --git a/.github/workflows/test_and_render.yaml b/.github/workflows/test_and_render.yaml
index bc586db..c189c29 100644
--- a/.github/workflows/test_and_render.yaml
+++ b/.github/workflows/test_and_render.yaml
@@ -10,11 +10,10 @@ jobs:
   test_and_render:
     runs-on: ubuntu-latest
     container:
-      image: europe-west3-docker.pkg.dev/tfl-prod-ea3b/tfl-docker/tfl-training-probabilistic-model-checking:latest
-      options: --user root
+      image: ghcr.io/aai-institute/tfl-training-probabilistic-model-checking:main
       credentials:
-        username: _json_key
-        password: ${{ secrets.GAR_JSON_KEY }}
+        username: ${{ github.actor }}
+        password: ${{ secrets.GITHUB_TOKEN }}
     steps:
       - name: Checkout
         uses: actions/checkout@v2