diff --git a/aider/__init__.py b/aider/__init__.py
index 3e2f46a3a..8ea1e3450 100644
--- a/aider/__init__.py
+++ b/aider/__init__.py
@@ -1 +1 @@
-__version__ = "0.9.0"
+__version__ = "0.9.0-dev"