diff --git a/django_mailbox/__init__.py b/django_mailbox/__init__.py
index 0d6a4f2..1e4d44c 100644
--- a/django_mailbox/__init__.py
+++ b/django_mailbox/__init__.py
@@ -1 +1 @@
-__version__ = '4.2.1'
+__version__ = '4.3.0a'