diff --git a/setup.py b/setup.py
--- a/setup.py
+++ b/setup.py
@@ -6,7 +6,7 @@ requirements = [
         "Pylons>=1.0.0",
         "SQLAlchemy>=0.6",
         "Mako>=0.3.2",
-        "vcs>=0.1.8",
+        "vcs==0.1.8",
         "pygments>=1.3.0",
         "mercurial>=1.6",
         "whoosh==1.0.0",