diff --git a/http-date.cabal b/http-date.cabal
--- a/http-date.cabal
+++ b/http-date.cabal
@@ -1,5 +1,5 @@
 Name:                   http-date
-Version:                0.0.9
+Version:                0.0.10
 Author:                 Kazu Yamamoto <kazu@iij.ad.jp>
 Maintainer:             Kazu Yamamoto <kazu@iij.ad.jp>
 License:                BSD3
@@ -18,7 +18,7 @@
                         Network.HTTP.Date.Formatter
                         Network.HTTP.Date.Types
                         Network.HTTP.Date.Parser
-  Build-Depends:        base >= 4 && < 5
+  Build-Depends:        base >= 4.8 && < 5
                       , array
                       , attoparsec
                       , bytestring
@@ -31,7 +31,7 @@
   Main-Is:              Spec.hs
   Other-Modules:        DateSpec
                         Model
-  Build-Depends:        base >= 4 && < 5
+  Build-Depends:        base >= 4.8 && < 5
                       , bytestring
                       , hspec
                       , http-date