diff --git a/.github/workflows/manylinux.yml b/.github/workflows/manylinux.yml
index 7058bf9..95e2c19 100644
--- a/.github/workflows/manylinux.yml
+++ b/.github/workflows/manylinux.yml
@@ -32,7 +32,7 @@ jobs:
         pip install twine setuptools-scm
         python setup.py sdist
     - name: upload to pypi if tagged
-      if: startsWith(github.ref, 'refs/tags')
+      if: startsWith(github.ref, 'refs/tags') && github.repository_owner == 'polm'
       env:
         TWINE_USERNAME: __token__
         TWINE_PASSWORD: ${{ secrets.PYPI_API_TOKEN }}
@@ -84,7 +84,7 @@ jobs:
         name: manylinux-wheels
         path: manylinux-wheels
     - name: Publish to PyPI if tagged
-      if: startsWith(github.ref, 'refs/tags')
+      if: startsWith(github.ref, 'refs/tags') && github.repository_owner == 'polm'
       env:
         TWINE_USERNAME: __token__
         TWINE_PASSWORD: ${{ secrets.PYPI_API_TOKEN }}
diff --git a/.github/workflows/osx.yml b/.github/workflows/osx.yml
index e8fc4cd..5a2375c 100644
--- a/.github/workflows/osx.yml
+++ b/.github/workflows/osx.yml
@@ -74,7 +74,7 @@ jobs:
         VERSION=$(python setup.py --version)
         pip install dist/mecab_python3-${VERSION}-cp${{ matrix.py-short }}-cp${{ matrix.py-short2 }}-macosx*.whl
     - name: Publish to PyPI if tagged
-      if: startsWith(github.ref, 'refs/tags')
+      if: startsWith(github.ref, 'refs/tags') && github.repository_owner == 'polm'
       env:
         TWINE_USERNAME: __token__
         TWINE_PASSWORD: ${{ secrets.PYPI_API_TOKEN }}
diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
index ac7e192..6e12d73 100644
--- a/.github/workflows/windows.yml
+++ b/.github/workflows/windows.yml
@@ -65,7 +65,7 @@ jobs:
         VERSION=$(python setup.py --version)
         pip install "dist/mecab_python3-${VERSION}-cp${{ matrix.py-short }}-cp${{ matrix.py-short2 }}-win_amd64.whl"
     - name: Publish to PyPI if tagged
-      if: startsWith(github.ref, 'refs/tags')
+      if: startsWith(github.ref, 'refs/tags') && github.repository_owner == 'polm'
       env:
         TWINE_USERNAME: __token__
         TWINE_PASSWORD: ${{ secrets.PYPI_API_TOKEN }}