diff --git a/mitogen/__init__.py b/mitogen/__init__.py
index 4c142e64..baa59b45 100644
--- a/mitogen/__init__.py
+++ b/mitogen/__init__.py
@@ -35,7 +35,7 @@ be expected. On the slave, it is built dynamically during startup.
 
 
 #: Library version as a tuple.
-__version__ = (0, 3, 25, 'b', 1)
+__version__ = (0, 3, 25, 'dev')
 
 
 #: This is :data:`False` in slave contexts. Previously it was used to prevent