diff --git a/happstack-clientsession.cabal b/happstack-clientsession.cabal
--- a/happstack-clientsession.cabal
+++ b/happstack-clientsession.cabal
@@ -1,5 +1,5 @@
 Name          : happstack-clientsession
-Version       : 7.2.6
+Version       : 7.2.7
 License       : BSD3
 License-file  : COPYING
 Synopsis      : client-side session data
@@ -28,6 +28,6 @@
     clientsession     >= 0.8 && < 0.10,
     happstack-server  >= 7.0 && < 7.4,
     monad-control     == 0.3.*,
-    mtl               >= 2.0 && < 2.2,
+    mtl               >= 2.0 && < 2.3,
     safecopy          >= 0.7 && < 0.9,
     transformers-base == 0.4.*