diff --git a/heredocs.cabal b/heredocs.cabal
--- a/heredocs.cabal
+++ b/heredocs.cabal
@@ -2,7 +2,7 @@
 -- documentation, see http://haskell.org/cabal/users-guide/
 
 name:                heredocs
-version:             0.1.3.0
+version:             0.1.3.1
 synopsis:            heredocument
 description:         heredocument
 homepage:            http://github.com/cutsea110/heredoc.git
@@ -36,7 +36,7 @@
   type:              exitcode-stdio-1.0
   ghc-options:       -threaded
   main-is:           doctests.hs
-  build-depends:     base
+  build-depends:     base >=4.8 && <4.9
                    , bytestring >= 0.10.6.0
                    , doctest >= 0.11.0
                    , heredocs