diff --git a/.github/workflows/docker_push.yml b/.github/workflows/docker_push.yml
index 1d68a467..178ecd01 100644
--- a/.github/workflows/docker_push.yml
+++ b/.github/workflows/docker_push.yml
@@ -5,10 +5,13 @@ name: Build and push docker images
 on:
   push:
     tags: ["v*"]
+    branches: [ tchap ]
   workflow_dispatch:
 
 permissions:
   contents: read
+  packages: write
+  id-token: write # needed for signing the images with GitHub OIDC Token
 
 jobs:
   build:
@@ -16,29 +19,36 @@ jobs:
     steps:
       - name: Set up QEMU
         id: qemu
-        uses: docker/setup-qemu-action@v1
+        uses: docker/setup-qemu-action@v3
         with:
           platforms: arm64
 
       - name: Set up Docker Buildx
         id: buildx
-        uses: docker/setup-buildx-action@v1
+        uses: docker/setup-buildx-action@v3
 
       - name: Inspect builder
         run: docker buildx inspect
 
-      - name: Log in to DockerHub
-        uses: docker/login-action@v1
+      - name: Install Cosign
+        uses: sigstore/cosign-installer@v3.5.0
+
+      - name: Log in to GHCR
+        uses: docker/login-action@v3
         with:
-          username: ${{ secrets.DOCKER_HUB_USERNAME }}
-          password: ${{ secrets.DOCKER_HUB_TOKEN }}
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
 
-      - name: Calculate docker image tags
+      - name: Calculate docker image tag
         id: set-tag
-        uses: docker/metadata-action@v3
+        uses: docker/metadata-action@v5
         with:
-          images: matrixdotorg/sygnal
+          images: ghcr.io/tchapgouv/sygnal
+          flavor: |
+            latest=false
           tags: |
+            type=raw,value=latest,enable=${{ github.ref == 'refs/heads/tchap' }}
             type=ref,event=tag
 
       # we explicitly check out the repository (and use `context: .` in buildx)
@@ -46,14 +56,28 @@ jobs:
       # (part of build system config in pyproject.toml) can deduce the package version.
       # See: https://github.com/marketplace/actions/build-and-push-docker-images#path-context
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Build and push all platforms
-        uses: docker/build-push-action@v2
+        id: build-and-push
+        uses: docker/build-push-action@v5
         with:
           context: .
           push: true
-          labels: "gitsha1=${{ github.sha }}"
+          labels: |
+            gitsha1=${{ github.sha }}
+            org.opencontainers.image.version=${{ env.SYNAPSE_VERSION }}
           tags: "${{ steps.set-tag.outputs.tags }}"
           file: "docker/Dockerfile"
           platforms: linux/amd64,linux/arm64
+
+      - name: Sign the images with GitHub OIDC Token
+        env:
+          DIGEST: ${{ steps.build-and-push.outputs.digest }}
+          TAGS: ${{ steps.set-tag.outputs.tags }}
+        run: |
+          images=""
+          for tag in ${TAGS}; do
+            images+="${tag}@${DIGEST} "
+          done
+          cosign sign --yes ${images}
\ No newline at end of file