diff --git a/happstack-hsp.cabal b/happstack-hsp.cabal
--- a/happstack-hsp.cabal
+++ b/happstack-hsp.cabal
@@ -1,5 +1,5 @@
 Name:                happstack-hsp
-Version:             7.3.0
+Version:             7.3.1
 Synopsis:            Support for using HSP templates in Happstack
 Description:         Happstack is a web application framework. HSP is an XML templating solution. This package makes it easy to use HSP templates with Happstack.
 Homepage:            http://www.happstack.com/
@@ -33,7 +33,7 @@
                        harp             >= 0.4 && < 0.5,
                        hsp              >= 0.9.2 && < 0.11,
                        hsx2hs           >= 0.13.0 && < 0.14,
-                       mtl              >= 1.1 && < 2.2,
+                       mtl              >= 1.1 && < 2.3,
                        utf8-string      == 0.3.*,
                        syb              >= 0.3 && < 0.5,
                        text             >= 0.10 && < 1.2