diff --git a/asyncpg/__init__.py b/asyncpg/__init__.py
index 13341e85..d06718a5 100644
--- a/asyncpg/__init__.py
+++ b/asyncpg/__init__.py
@@ -31,4 +31,4 @@
 #    snapshots will automatically include the git revision
 #    in __version__, for example: '0.16.0.dev0+ge06ad03'
 
-__version__ = '0.21.0'
+__version__ = '0.22.0.dev0'