diff --git a/.github/workflows/dockers_builder_dev.yml b/.github/workflows/dockers_builder_dev.yml
index e5bdd5e994..a62d62a7db 100644
--- a/.github/workflows/dockers_builder_dev.yml
+++ b/.github/workflows/dockers_builder_dev.yml
@@ -1,6 +1,7 @@
 name: Build Navitia Dockers (Dev)
 
 on:
+  pull_request:
   push:
     branches:
       - dev
@@ -209,31 +210,25 @@ jobs:
         run: |
           pip install -r core_team_ci_tools/github_artifacts/requirements.txt --user
 
-      - name: Download mimirsbrunn package
-        run: |
-          mimirsbrunn_package="debian-package-master.zip"
-          python3 core_team_ci_tools/github_artifacts/github_artifacts.py \
-              -o hove-io \
-              -r mimirsbrunn \
-              -t ${{ steps.ci-core-app-token.outputs.token }} \
-              -w main7.yml \
-              -a debian-package-master.zip \
-              --output-dir .
-          unzip -qo $mimirsbrunn_package
-          rm -f $mimirsbrunn_package
+      # don't forget to update the version of mimirsbrunn if necessary!!
+      - name: Download mimirsbrunn v3.1.0 from release
+        uses: dsaltares/fetch-gh-release-asset@master
+        with:
+          repo: 'hove-io/mimirsbrunn'
+          version: 'tags/v3.1.0'
+          file: 'mimirsbrunn7_${{env.jessie_version}}-3.1.0.deb'
+          target: 'mimirsbrunn7_${{env.jessie_version}}-3.1.0.deb'
+          token: ${{ steps.ci-core-app-token.outputs.token }}
 
-      - name: Download cosmogony2cities package
-        run: |
-          cosmogony2cities_package="package-${{env.jessie_version}}.zip"
-          python3 core_team_ci_tools/github_artifacts/github_artifacts.py \
-              -o hove-io \
-              -r cosmogony2cities \
-              -t ${{ steps.ci-core-app-token.outputs.token }} \
-              -w build_package.yml \
-              -a $cosmogony2cities_package \
-              --output-dir .
-          unzip -qo $cosmogony2cities_package
-          rm -f $cosmogony2cities_package
+      # don't forget to update the version of cosmogony2cities if necessary!!
+      - name: Download cosmogony2cities from release
+        uses: dsaltares/fetch-gh-release-asset@master
+        with:
+          repo: 'hove-io/cosmogony2cities'
+          version: 'tags/v0.1.1'
+          file: 'cosmogony2cities-${{env.jessie_version}}.deb'
+          target: 'cosmogony2cities_0.1.0-1_amd64.deb'
+          token: ${{ steps.ci-core-app-token.outputs.token }}
 
       - name: Download mimir-config package
         run: |
diff --git a/.github/workflows/dockers_builder_release.yml b/.github/workflows/dockers_builder_release.yml
index d6ccb21710..0fa4d0856c 100644
--- a/.github/workflows/dockers_builder_release.yml
+++ b/.github/workflows/dockers_builder_release.yml
@@ -234,18 +234,14 @@ jobs:
           unzip -qo $mimirsbrunn_package
           rm -f $mimirsbrunn_package
 
-      - name: Download cosmogony2cities package
-        run: |
-          cosmogony2cities_package="package-${{env.jessie_version}}.zip"
-          python3 core_team_ci_tools/github_artifacts/github_artifacts.py \
-              -o hove-io \
-              -r cosmogony2cities \
-              -t ${{ steps.ci-core-app-token.outputs.token }} \
-              -w build_package.yml \
-              -a $cosmogony2cities_package \
-              --output-dir .
-          unzip -qo $cosmogony2cities_package
-          rm -f $cosmogony2cities_package
+      - name: Download cosmogony2cities from release
+        uses: dsaltares/fetch-gh-release-asset@master
+        with:
+          repo: 'hove-io/cosmogony2cities'
+          version: 'tags/v0.1.1'
+          file: 'cosmogony2cities-${{env.jessie_version}}.deb'
+          target: 'cosmogony2cities_0.1.0-1_amd64.deb'
+          token: ${{ steps.ci-core-app-token.outputs.token }}
 
       - name: Download mimir-config package
         run: |