diff --git a/Happstack/Server/Heist.hs b/Happstack/Server/Heist.hs
--- a/Happstack/Server/Heist.hs
+++ b/Happstack/Server/Heist.hs
@@ -69,7 +69,7 @@
 --
 module Happstack.Server.Heist
     ( initHeistCompiled
-   , heistServe
+    , heistServe
     )
     where
 
diff --git a/happstack-heist.cabal b/happstack-heist.cabal
--- a/happstack-heist.cabal
+++ b/happstack-heist.cabal
@@ -1,5 +1,5 @@
 Name:                happstack-heist
-Version:             7.2.0
+Version:             7.2.1
 Synopsis:            Support for using Heist templates in Happstack
 Description:         Happstack is a web application framework. Heist is an XML templating solution. This package makes it easy to use Heist templates with Happstack.
 Homepage:            http://www.happstack.com/
@@ -22,7 +22,7 @@
   Build-depends:       base             >= 3.0 && < 5.0,
                        blaze-builder    >= 0.2 && <0.4,
                        bytestring       >= 0.9 && < 0.11,
-                       either           == 3.4.*,
+                       either           >= 3.4 && < 5,
                        filepath,
                        happstack-server >= 7.0 && < 7.4,
                        heist            >= 0.13 && < 0.14,