diff --git a/Web/Twitter/Types.hs b/Web/Twitter/Types.hs
--- a/Web/Twitter/Types.hs
+++ b/Web/Twitter/Types.hs
@@ -35,7 +35,6 @@
 import Data.Aeson
 import Data.Aeson.Types (Parser)
 import Data.Text (Text)
-import Data.ByteString (ByteString)
 import Data.HashMap.Strict (HashMap)
 import Control.Applicative
 import Control.Monad
@@ -43,7 +42,7 @@
 type DateString   = String
 type UserId       = Integer
 type Friends      = [UserId]
-type URIString    = ByteString
+type URIString    = Text
 type UserName     = Text
 type StatusId     = Integer
 type LanguageCode = String
diff --git a/twitter-types.cabal b/twitter-types.cabal
--- a/twitter-types.cabal
+++ b/twitter-types.cabal
@@ -1,5 +1,5 @@
 name:              twitter-types
-version:           0.1.20130101
+version:           0.2.20130101
 license:           BSD3
 license-file:      LICENSE
 author:            Takahiro HIMURA
@@ -23,7 +23,6 @@
       base >= 4 && < 5
     , http-types
     , aeson >= 0.3.2.2
-    , bytestring
     , text
     , unordered-containers
 
@@ -46,7 +45,6 @@
     , http-types
     , aeson
     , attoparsec
-    , bytestring
     , text
     , unordered-containers