diff --git a/.github/workflows/publish-to-test-pypi.yaml b/.github/workflows/publish-to-test-pypi.yaml
new file mode 100644
index 0000000..076eac1
--- /dev/null
+++ b/.github/workflows/publish-to-test-pypi.yaml
@@ -0,0 +1,77 @@
+name: publish-to-test-pypi
+
+on:
+  push:
+    branches: ["test_pypi"]
+
+jobs:
+  build:
+    name: Build distribution
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8
+
+      - name: Set up Python
+        uses: actions/setup-python@e797f83bcb11b83ae66e0230d6156d7c80228e7c
+        with:
+          python-version: "3.x"
+
+      - name: Install uv
+        uses: astral-sh/setup-uv@85856786d1ce8acfbcc2f13a5f3fbd6b938f9f41 # v7.1.2
+
+      - name: Build distributions with uv
+        run: uv build
+
+      - name: Install twine
+        run: uv tool install twine
+
+      - name: Rename distributions with build number
+        run: |
+          BUILD_NUMBER=${GITHUB_RUN_NUMBER}
+          for file in dist/*.whl; do
+            base=$(basename "$file")
+            new=$(echo "$base" | sed "s/\(-py[0-9]\)/-${BUILD_NUMBER}\1/")
+            
+            mv "dist/$base" "dist/$new"
+            echo "Renamed $base → $new"
+          done
+      - name: Validate metadata
+        run: |
+          uv run twine check dist/*
+      - name: Install built wheel
+        run uv pip install dist/*.whl
+
+      - name: Test import
+        run: python -c "import dcm230"
+
+      - name: Upload distributions as artifact
+        uses: actions/upload-artifact@330a01c490aca151604b8cf639adc76d48f6c5d4 # v5.0.0
+        with:
+          name: dist-files
+          path: dist/
+
+  publish-to-test-pypi:
+    name: Publish Python distribution to TestPyPI
+    needs: [build]
+    runs-on: ubuntu-latest
+
+    environment:
+      name: testpypi
+      url: https://test.pypi.org/p/python-dcm230
+
+    permissions:
+      id-token: write
+
+    steps:
+      - name: Download all build artifacts
+        uses: actions/download-artifact@018cc2cf5baa6db3ef3c5f8a56943fffe632ef53 # v6.0.0
+        with:
+          name: dist-files
+          path: dist/
+
+      - name: Publish distribution to TestPyPI
+        uses: pypa/gh-action-pypi-publish@ed0c53931b1dc9bd32cbe73a98c7f6766f8a527e
+        with:
+          repository-url: https://test.pypi.org/legacy/