diff --git a/.github/workflows/release.yaml b/.github/workflows/release.yaml
new file mode 100644
index 0000000..03696c9
--- /dev/null
+++ b/.github/workflows/release.yaml
@@ -0,0 +1,126 @@
+name: Release to PyPI
+
+# Testing with corrected TestPyPI trusted publisher config
+
+on:
+  push:
+    tags:
+      - 'v*'
+    branches:
+      - 'test-release-*'
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.10"
+
+      - name: Install uv
+        uses: astral-sh/setup-uv@v3
+        with:
+          version: "0.7.17"
+
+      - name: Install dependencies
+        run: |
+          uv sync --group dev
+
+      - name: Run tests
+        run: |
+          uv run pytest tests/ --cov=src --cov-report=term-missing -v
+
+      - name: Run linting
+        run: |
+          uv run pre-commit run --all-files
+
+      - name: Build package
+        run: |
+          uv build
+
+      - name: Check build
+        run: |
+          uv run twine check dist/*
+
+      - name: Upload build artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: python-package-distributions
+          path: dist/
+
+  publish-to-testpypi:
+    name: Publish Python 🐍 distribution 📦 to TestPyPI
+    if: startsWith(github.ref_name, 'test-release-')
+    needs: build
+    runs-on: ubuntu-latest
+    environment:
+      name: testpypi
+      url: https://test.pypi.org/p/munge
+    permissions:
+      id-token: write  # IMPORTANT: mandatory for trusted publishing
+
+    steps:
+    - name: Download all the dists
+      uses: actions/download-artifact@v4
+      with:
+        name: python-package-distributions
+        path: dist/
+
+    - name: Debug environment and files
+      run: |
+        echo "=== Environment Debug ==="
+        echo "GITHUB_REF: $GITHUB_REF"
+        echo "GITHUB_REF_NAME: $GITHUB_REF_NAME"
+        echo "GITHUB_REPOSITORY: $GITHUB_REPOSITORY"
+        echo "GITHUB_WORKFLOW: $GITHUB_WORKFLOW"
+        echo ""
+        echo "=== Distribution Files ==="
+        ls -la dist/
+        echo "Number of files: $(ls -1 dist/ | wc -l)"
+        echo ""
+        echo "=== File Contents Check ==="
+        for file in dist/*; do
+          echo "File: $file"
+          echo "Size: $(stat -c%s "$file") bytes"
+        done
+
+    - name: Publish distribution 📦 to TestPyPI
+      uses: pypa/gh-action-pypi-publish@release/v1
+      with:
+        repository-url: https://test.pypi.org/legacy/
+
+    - name: TestPyPI publishing status
+      run: |
+        echo "TestPyPI publishing attempted."
+        echo "If it failed, you need to configure trusted publishing at:"
+        echo "https://test.pypi.org/manage/account/publishing/"
+        echo ""
+        echo "Configuration needed:"
+        echo "- Repository: 20c/munge"
+        echo "- Workflow filename: release.yaml"
+        echo "- Environment name: (leave empty for now)"
+
+  publish-to-pypi:
+    name: Publish to PyPI
+    if: startsWith(github.ref, 'refs/tags/v')
+    needs: build
+    runs-on: ubuntu-latest
+    environment:
+      name: pypi
+      url: https://pypi.org/p/munge
+    permissions:
+      id-token: write  # IMPORTANT: this permission is mandatory for trusted publishing
+
+    steps:
+    - name: Download all the dists
+      uses: actions/download-artifact@v4
+      with:
+        name: python-package-distributions
+        path: dist/
+
+    - name: Publish distribution to PyPI
+      uses: pypa/gh-action-pypi-publish@release/v1
\ No newline at end of file
diff --git a/pyproject.toml b/pyproject.toml
index 2590312..65be24f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "munge"
-version = "1.3.0"
+version = "1.3.1.dev1"
 description = "data manipulation library and client"
 readme = "README.md"
 authors = [{name = "20C", email = "code@20c.com"}]