diff --git a/GLUtil.cabal b/GLUtil.cabal
--- a/GLUtil.cabal
+++ b/GLUtil.cabal
@@ -1,5 +1,5 @@
 Name:                GLUtil
-Version:             0.9.1.0
+Version:             0.9.1.1
 Synopsis:            Miscellaneous OpenGL utilities.
 License:             BSD3
 License-file:        LICENSE
@@ -58,7 +58,7 @@
                        transformers >= 0.3,
                        vector >= 0.7
   if impl(ghc >= 7.10.1)
-    Build-depends:     hpp >= 0.3.1 && < 0.4
+    Build-depends:     hpp >= 0.3.1 && < 0.5
     GHC-Options:       -pgmPhpp -optP--cpp -optP-P
   else
     Build-tools:       cpphs