diff --git a/.github/workflows/test-publish-pypi.yaml b/.github/workflows/test-publish-pypi.yaml
index 94a9615..f179ad9 100644
--- a/.github/workflows/test-publish-pypi.yaml
+++ b/.github/workflows/test-publish-pypi.yaml
@@ -25,6 +25,19 @@ jobs:
           python -m pip install --upgrade pip
           pip install build
 
+      - name: Add build number to package version
+        shell: python
+        run: |
+          import toml
+          
+          with open("pyproject.toml", "r") as f:
+            data = toml.load(f)
+          
+          data["project"]["version"] = f"{data["project"]["version"]}.dev${{ github.run_id }}"
+          
+          with open("pyproject.toml", "w") as f:
+            toml.dump(data, f)
+
       - name: Build package
         run: python -m build
 
@@ -34,3 +47,4 @@ jobs:
           user: __token__
           password: ${{ secrets.PYPI_TOKEN }}
           repository-url: https://test.pypi.org/legacy/
+          skip-existing: true
diff --git a/pyproject.toml b/pyproject.toml
index 09adb34..2b6d939 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "copyright2"
-version = "0.1.0"
+version = "0.1.1"
 description = "Text file copyright notice linter and updater."
 authors = [{name = "Connor Newton", email = "connor@ifthenelse.io" }]
 readme = "README.md"