diff --git a/setup.py b/setup.py
--- a/setup.py
+++ b/setup.py
@@ -16,7 +16,7 @@ class install_package_data(install_data)
         install_data.finalize_options(self)
 
 setup(name='mercurial',
-      version='0.5',
+      version='0.5b',
       author='Matt Mackall',
       author_email='mpm@selenic.com',
       url='http://selenic.com/mercurial',