diff --git a/setup.py b/setup.py
--- a/setup.py
+++ b/setup.py
@@ -45,7 +45,7 @@ requirements = [
     "waitress >= 0.8.8, < 1.4",
     "WebOb >= 1.8, < 1.9",
     "backlash >= 0.1.2, < 1",
-    "TurboGears2 >= 2.3.10, < 2.5",
+    "TurboGears2 >= 2.4, < 2.5",
     "tgext.routes >= 0.2.0, < 1",
     "Beaker >= 1.7.0, < 2",
     "WebHelpers2 >= 2.0, < 2.1",