diff --git a/.gitea/workflows/publish.yml b/.gitea/workflows/publish.yml
index 1329dc9..d0666fd 100644
--- a/.gitea/workflows/publish.yml
+++ b/.gitea/workflows/publish.yml
@@ -24,6 +24,26 @@ jobs:
           python -m pip install --upgrade pip
           python -m pip install build twine
 
+      - name: Set CI package version
+        run: |
+          python - <<'PY'
+          from pathlib import Path
+          import os
+          import re
+
+          path = Path('tryton.cfg')
+          text = path.read_text()
+          match = re.search(r'(?m)^version=(.+)$', text)
+          if not match:
+              raise SystemExit('tryton.cfg has no version entry')
+          base_version = match.group(1).strip()
+          run_number = os.environ.get('GITHUB_RUN_NUMBER', '0')
+          ci_version = f'{base_version}.post{run_number}'
+          text = re.sub(r'(?m)^version=.+$', f'version={ci_version}', text)
+          path.write_text(text)
+          print(f'Package version: {ci_version}')
+          PY
+
       - name: Build package
         run: |
           python -m build
@@ -32,12 +52,19 @@ jobs:
         run: |
           python -m twine check dist/*
 
+      - name: Check publishing credentials
+        env:
+          TWINE_USERNAME: ${{ secrets.GITEA_PACKAGE_USER }}
+          TWINE_PASSWORD: ${{ secrets.GITEA_PACKAGE_TOKEN }}
+        run: |
+          test -n "$TWINE_USERNAME" || { echo "Missing GITEA_PACKAGE_USER secret"; exit 1; }
+          test -n "$TWINE_PASSWORD" || { echo "Missing GITEA_PACKAGE_TOKEN secret"; exit 1; }
+
       - name: Publish to Gitea PyPI registry
         env:
           TWINE_USERNAME: ${{ secrets.GITEA_PACKAGE_USER }}
           TWINE_PASSWORD: ${{ secrets.GITEA_PACKAGE_TOKEN }}
         run: |
           python -m twine upload \
-            --skip-existing \
             --repository-url https://gitea.joseagrc.com/api/packages/tryton-do/pypi \
             dist/*
diff --git a/doc/publishing.rst b/doc/publishing.rst
index 78bcd37..a0082fc 100644
--- a/doc/publishing.rst
+++ b/doc/publishing.rst
@@ -6,9 +6,12 @@ PyPI-compatible package registry. The workflow intentionally does not use
 ``actions/upload-artifact`` because current Gitea Actions runners do not support
 the GitHub artifact API required by ``upload-artifact@v4``.
 
-The publishing workflow uses ``twine upload --skip-existing`` so repeated
-commits with the same package version do not fail. To publish a new package
-artifact, update the module version in ``tryton.cfg`` before pushing.
+The publishing workflow creates a CI-only package version by appending the run
+number to the module version from ``tryton.cfg``. For example, a module version
+of ``8.0.0`` is published as ``8.0.0.post123`` on run number ``123``.
+
+This is necessary because Gitea's PyPI-compatible registry is a custom package
+repository for Twine and does not support ``twine upload --skip-existing``.
 
 Required repository secrets: