diff --git a/setup.py b/setup.py
index b148fa8..065bfb4 100644
--- a/setup.py
+++ b/setup.py
@@ -3,7 +3,7 @@
 from setuptools import setup
 
 
-version = "5.0.5"
+version = "5.0.6.dev0"
 
 long_description = (
     f"{Path('README.rst').read_text()}\n{Path('CHANGES.rst').read_text()}"