diff --git a/src/resolvelib/__init__.py b/src/resolvelib/__init__.py
index fa6995e..ff46f23 100644
--- a/src/resolvelib/__init__.py
+++ b/src/resolvelib/__init__.py
@@ -11,7 +11,7 @@
     "ResolutionTooDeep",
 ]
 
-__version__ = "0.9.0"
+__version__ = "0.9.1.dev0"
 
 
 from .providers import AbstractProvider, AbstractResolver