diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 8b9ad40..34b9c6e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -25,6 +25,12 @@ jobs:
         with:
           arguments: build
         timeout-minutes: 20
+      - name: Upload diagnoses
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: ${{ matrix.run }}-diagnoses
+          path: build/diagnoses
   build-check:
     runs-on: ubuntu-latest
     needs: build