diff --git a/.github/workflows/python-publish.yml b/.github/workflows/python-publish.yml
index b9892e5..10fb238 100644
--- a/.github/workflows/python-publish.yml
+++ b/.github/workflows/python-publish.yml
@@ -16,8 +16,28 @@ permissions:
   contents: read
 
 jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.x"
+
+      - name: Install package with dev dependencies
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install -e .[dev]
+
+      - name: Run tests
+        run: python -m pytest
+
   release-build:
     runs-on: ubuntu-latest
+    needs:
+      - test
 
     steps:
       - uses: actions/checkout@v4
@@ -28,7 +48,6 @@ jobs:
 
       - name: Build release distributions
         run: |
-          # NOTE: put your own distribution build steps here.
           python -m pip install build
           python -m build
 
diff --git a/.github/workflows/python-testpypi-publish.yml b/.github/workflows/python-testpypi-publish.yml
new file mode 100644
index 0000000..12afb13
--- /dev/null
+++ b/.github/workflows/python-testpypi-publish.yml
@@ -0,0 +1,87 @@
+# This workflow will upload a Python Package to PyPI when a release is created
+# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-python#publishing-to-package-registries
+
+# This workflow uses actions that are not certified by GitHub.
+# They are provided by a third-party and are governed by
+# separate terms of service, privacy policy, and support
+# documentation.
+
+name: Upload Python Package to TestPyPI
+
+on:
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.x"
+
+      - name: Install package with dev dependencies
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install -e .[dev]
+
+      - name: Run tests
+        run: python -m pytest
+
+  test-build:
+    runs-on: ubuntu-latest
+    needs: test
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.x"
+
+      - name: Build test distributions
+        run: |
+          python -m pip install build
+          python -m build
+
+      - name: Upload distributions
+        uses: actions/upload-artifact@v4
+        with:
+          name: testpypi-dists
+          path: dist/
+
+  testpypi-publish:
+    runs-on: ubuntu-latest
+    needs:
+      - test-build
+    permissions:
+      # IMPORTANT: this permission is mandatory for trusted publishing
+      id-token: write
+
+    # Dedicated environments with protections for publishing are strongly recommended.
+    # For more information, see: https://docs.github.com/en/actions/deployment/targeting-different-environments/using-environments-for-deployment#deployment-protection-rules
+    environment:
+      name: testpypi
+      # OPTIONAL: uncomment and update to include your PyPI project URL in the deployment status:
+      url: https://test.pypi.org/project/talespire-encoding
+      #
+      # ALTERNATIVE: if your GitHub Release name is the PyPI project version string
+      # ALTERNATIVE: exactly, uncomment the following line instead:
+      # url: https://pypi.org/project/YOURPROJECT/${{ github.event.release.name }}
+
+    steps:
+      - name: Retrieve test distributions
+        uses: actions/download-artifact@v4
+        with:
+          name: testpypi-dists
+          path: dist/
+
+      - name: Publish test distributions to TestPyPI
+        uses: pypa/gh-action-pypi-publish@release/v1
+        with:
+          repository-url: https://test.pypi.org/legacy/
diff --git a/pyproject.toml b/pyproject.toml
index 86e09f0..586f1ac 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "talespire-encoding"
-version = "1.2.3"
+version = "1.2.4"
 description = "Encoding and decoding tools for TaleSpire data"
 readme = "README.md"
 requires-python = ">=3.10"
@@ -20,7 +20,7 @@ Repository = "https://github.com/Baldrax/TaleSpire-Encoding-Python"
 
 [project.optional-dependencies]
 dev = [
-    "pytest"
+    "pytest==8.3.4"
 ]
 
 [tool.setuptools]
diff --git a/ts_encoding/__init__.py b/ts_encoding/__init__.py
index 2507e85..e5d96ab 100644
--- a/ts_encoding/__init__.py
+++ b/ts_encoding/__init__.py
@@ -1,4 +1,4 @@
-__version__ = "1.2.3"
+__version__ = "1.2.4"
 
 from .exceptions import (
     SlabExceedsSizeLimit,