diff --git a/wagtail/wagtailcore/__init__.py b/wagtail/wagtailcore/__init__.py
index 506cb8723..4d1242daf 100644
--- a/wagtail/wagtailcore/__init__.py
+++ b/wagtail/wagtailcore/__init__.py
@@ -1,4 +1,4 @@
-__version__ = '1.2rc1'
+__version__ = '1.3a1'
 default_app_config = 'wagtail.wagtailcore.apps.WagtailCoreAppConfig'