diff --git a/aider/__init__.py b/aider/__init__.py
index 08d7b23d3..43f75e7fa 100644
--- a/aider/__init__.py
+++ b/aider/__init__.py
@@ -1 +1 @@
-__version__ = "0.40.3"
+__version__ = "0.40.4-dev"