diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 4ff9e8b1..7816de7f 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -1,8 +1,6 @@
 name: Release
 on:
   push:
-    branches:
-      - master
     tags:
       - '*'
 
@@ -24,3 +22,11 @@ jobs:
         with:
           name: dist
           path: dist/
+
+      - name: Upload packages to Jazzband
+        if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags')
+        uses: pypa/gh-action-pypi-publish@release/v1.8
+        with:
+          user: jazzband
+          password: ${{ secrets.JAZZBAND_RELEASE_KEY }}
+          repository_url: https://jazzband.co/projects/django-polymorphic/upload
diff --git a/polymorphic/__init__.py b/polymorphic/__init__.py
index afd1dfc1..5931c5b0 100644
--- a/polymorphic/__init__.py
+++ b/polymorphic/__init__.py
@@ -6,7 +6,7 @@
 Please see LICENSE and AUTHORS for more information.
 """
 
-VERSION = "3.1.0"
+VERSION = "4.0.0a"
 
 # version synonym for backwards compatibility
 __version__ = VERSION