diff --git a/setup.py b/setup.py
--- a/setup.py
+++ b/setup.py
@@ -36,9 +36,9 @@ is_windows = __platform__ in ['Windows']
 
 requirements = [
     "waitress==0.8.8",
-    "webob==1.0.8",
+    "webob>=1.0.8,<=1.1.1",
     "webtest==1.4.3",
-    "Pylons==1.0.0",
+    "Pylons>=1.0.0,<=1.0.2",
     "Beaker==1.6.4",
     "WebHelpers==1.3",
     "formencode>=1.2.4,<=1.2.6",