--- a/utf8-string.cabal
+++ b/utf8-string.cabal
@@ -19,7 +19,7 @@ Tested-With:        GHC==7.0.4, GHC==7.4
 library
   Ghc-options:        -W -O2
 
-  build-depends: base >= 4.3 && < 4.9, bytestring >= 0.9
+  build-depends: base >= 4.3 && < 4.10, bytestring >= 0.9
 
   Extensions:         CPP
   Exposed-modules:    Codec.Binary.UTF8.String