diff --git a/bidict/metadata.py b/bidict/metadata.py
index c84e420..9c0cb22 100644
--- a/bidict/metadata.py
+++ b/bidict/metadata.py
@@ -7,7 +7,7 @@
 """Define bidict package metadata."""
 
 
-__version__ = '0.22.0'
+__version__ = '0.22.1.dev0'
 __author__ = 'Joshua Bronson'
 __maintainer__ = 'Joshua Bronson'
 __copyright__ = 'Copyright 2009-2022 Joshua Bronson'