diff --git a/setup.cfg b/setup.cfg
index 9e26b22..8366c42 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -4,7 +4,7 @@ universal = 1
 [metadata]
 license_file = LICENSE
 name = pynamodb-attributes
-version = 0.4.0
+version = 0.5.0
 description = Common attributes for PynamoDB
 long_description = file:README.md
 long_description_content_type = text/markdown