diff --git a/dwave/optimization/__init__.py b/dwave/optimization/__init__.py
index 2762ad1f..f76fc111 100644
--- a/dwave/optimization/__init__.py
+++ b/dwave/optimization/__init__.py
@@ -17,7 +17,7 @@
 from dwave.optimization.model import Model
 from dwave.optimization.mathematical import *
 
-__version__ = "0.4.1"
+__version__ = "0.4.2.dev"
 
 
 def get_include() -> str: