diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index 4b5e0f58f..fcf117191 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -18,7 +18,9 @@ jobs:
       image: ghcr.io/esl-epfl/x-heep-toolchain:latest
     steps:
     - uses: actions/checkout@v2
-    - uses: actions/setup-python@v2
+      with :
+        fetch-depth: 0
+    # - uses: actions/setup-python@v2
       with:
         python-version: 3.9
     # - name: Install requirements
@@ -30,8 +32,13 @@ jobs:
         conda activate core-v-mini-mcu
         find . \
         -name '*.vendor.hjson' \
-        | xargs -n1 util/vendor.py --verbose \
-        && git diff --exit-code
+        | xargs -n1 util/vendor.py --verbose
+        if git diff --exit-code; then
+          echo "No differences found, vendor is up-to-date."
+        else
+          echo "::error ::Found differences, please re-vendor."
+          exit 1
+        fi
   ##################
   # MCU Generator  #
   ##################
@@ -43,7 +50,7 @@ jobs:
       image: ghcr.io/esl-epfl/x-heep-toolchain:latest
     steps:
     - uses: actions/checkout@v2
-    - uses: actions/setup-python@v2
+    # - uses: actions/setup-python@v2
       with:
         python-version: 3.8
     # - name: Install requirements