diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index aad4ff16..731dbbff 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -24,7 +24,8 @@ jobs:
         shell: bash -l {0}
 
     steps:
-    - uses: actions/checkout@v4
+    - name: Checkout code
+      uses: actions/checkout@v4
 
     - name: Setup micromamba
       uses: mamba-org/setup-micromamba@v2
@@ -49,3 +50,15 @@ jobs:
       with:
         name: technology-data
         path: outputs/
+
+    - name: Check for differences in generated outputs
+      run: |-
+        git config --global --add safe.directory $GITHUB_WORKSPACE
+        git add outputs/
+        if ! git diff --cached --quiet; then
+          echo "Generated outputs differ from the branch. Please commit rerun `snakemake` and commit the changes to the `outputs/*.csv` files."
+          git diff --cached
+          exit 1
+        else
+          echo "No differences found in generated outputs."
+        fi
diff --git a/docs/release_notes.rst b/docs/release_notes.rst
index 0f2b8c1b..a64fcb03 100644
--- a/docs/release_notes.rst
+++ b/docs/release_notes.rst
@@ -48,6 +48,8 @@ Upcoming Release
 
 * Adds rounding for the value column of the csv files produced by compile_cost_assumptions_usa (https://github.com/PyPSA/technology-data/pull/206)
 
+* Updates ci.yaml such that it fails if the generated outputs are different than the ones committed (https://github.com/PyPSA/technology-data/pull/205)
+
 `v0.11.0 <https://github.com/PyPSA/technology-data/releases/tag/v0.11.0>`__ (24th January 2025)
 =======================================================================================