diff --git a/Text/StringConvert.hs b/Text/StringConvert.hs
--- a/Text/StringConvert.hs
+++ b/Text/StringConvert.hs
@@ -3,10 +3,10 @@
 -- strict), and String, are supported.
 --
 -- To hook custom string types into the conversion mechanism, implement both
--- @FromString@ and @ToString@ for your type.
+-- @IsString@ and @ToString@ for your type.
 {-#LANGUAGE FlexibleInstances #-}
 module Text.StringConvert
-( FromString
+( IsString
 , fromString
 , ToString
 , toString
@@ -19,24 +19,7 @@
 import qualified Data.ByteString.UTF8 as UTF8
 import qualified Data.ByteString.Lazy.UTF8 as LUTF8
 import qualified Data.ByteString.Lazy as LBS
-
-class FromString a where
-    fromString :: String -> a
-
-instance FromString [Char] where
-    fromString = id
-
-instance FromString Text.Text where
-    fromString = Text.pack
-
-instance FromString LText.Text where
-    fromString = LText.pack
-
-instance FromString UTF8.ByteString where
-    fromString = UTF8.fromString
-
-instance FromString LUTF8.ByteString where
-    fromString = LUTF8.fromString
+import Data.String (IsString (..))
 
 -- | Defines how a given type should be converted to String.
 -- If at all possible, the conversion should be loss-less, and if encodings are
@@ -70,11 +53,11 @@
 {-# RULES "s/LBS->BS" s = LBS.toStrict #-}
 {-# RULES "s/BS->LBS" s = LBS.fromStrict #-}
 
--- conversions to and from string can be done through the ToString / FromString
+-- conversions to and from string can be done through the ToString / IsString
 -- classes
 {-# RULES "s/->String" s = toString #-}
 {-# RULES "s/String->" s = fromString #-}
 
 {-# NOINLINE s #-}
-s :: (ToString a, FromString b) => a -> b
+s :: (ToString a, IsString b) => a -> b
 s = fromString . toString
diff --git a/string-convert.cabal b/string-convert.cabal
--- a/string-convert.cabal
+++ b/string-convert.cabal
@@ -1,31 +1,30 @@
--- Initial string-convert.cabal generated by cabal init.  For further
+-- Initial string-convert.cabal generated by cabal init.  For further 
 -- documentation, see http://haskell.org/cabal/users-guide/
 
 name:                string-convert
-version:             3.0.1
+version:             4.0.0.1
 synopsis:            Universal string conversions
-description:         Provides functions and typeclasses for transparent
-                     conversions between various string types.
+description:         Provide unified conversion functions between any two string-like types.
 homepage:            https://bitbucket.org/tdammers/string-convert
 license:             BSD3
 license-file:        LICENSE
 author:              Tobias Dammers
 maintainer:          tdammers@gmail.com
-copyright:           2016 Tobias Dammers
+-- copyright:           
 category:            Text
 build-type:          Simple
--- extra-source-files:
+-- extra-source-files:  
 cabal-version:       >=1.10
 
 library
   exposed-modules:     Text.StringConvert
-  -- other-modules:
-  -- other-extensions:
+  -- other-modules:       
+  -- other-extensions:    
   build-depends: base >=4.5 && <5.0
                , bytestring
                , text
                , utf8-string
-  -- hs-source-dirs:
+  -- hs-source-dirs:      
   default-language:    Haskell2010
 test-suite tests
   build-depends: base >= 4.5 && <5.0