diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index c8de9d0..4512526 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -65,6 +65,31 @@ jobs:
           name: sphgeom-sdist
           path: dist/*
 
+  check-changes:
+    outputs:
+      skip: ${{ steps.check.outputs.skip }}
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: Check if weekly changed
+        id: check
+        run: |
+          prev_tag=$(git tag -l 'w.*' | sort | tail -2 | head -1)
+          prev_sha=$(git rev-list -1 "$prev_tag")
+          echo "Previous tag ${prev_tag} (${prev_sha})"
+          current_tag=${GITHUB_REF#refs/tags/}
+          current_sha=$(git rev-list -1 "$current_tag")
+          echo "Current tag ${current_tag} (${current_sha})"
+          if [ "$current_sha" = "$prev_sha" ]; then
+            echo "Hashes are identical - Skipping upload"
+            echo "skip=true" >> "$GITHUB_ENV"
+          else
+            echo "Hashes differ - Enable upload"
+            echo "skip=false" >> "$GITHUB_ENV"
+          fi
+
   pypi_wheel_build:
     strategy:
       matrix:
@@ -110,7 +135,8 @@ jobs:
           path: dist/*
 
   pipy_upload:
-    needs: [pypi_sdist_build, pypi_wheel_build]
+    needs: [pypi_sdist_build, pypi_wheel_build, check-changes]
+    if: "!startsWith(github.ref, 'refs/tags/w.') || needs.check-changes.outputs.skip == 'false'"
     runs-on: ubuntu-latest
     steps:
       - uses: actions/download-artifact@v4