diff --git a/Data/Text/Glyphize/Buffer.hs b/Data/Text/Glyphize/Buffer.hs
--- a/Data/Text/Glyphize/Buffer.hs
+++ b/Data/Text/Glyphize/Buffer.hs
@@ -10,7 +10,6 @@
 
 --- To fill computed text property.
 import Data.Text.Encoding (decodeUtf8Lenient)
-import Codec.Binary.UTF8.Light (encodeUTF8, w2c, c2w)
 
 import qualified Data.Text.Array as A
 import GHC.Exts (ByteArray#, sizeofByteArray#, Int#)
@@ -282,6 +281,11 @@
     w2c (shiftR tag 8 .&. 0x7f),
     w2c (shiftR tag 0 .&. 0x7f)
   ]
+
+c2w :: Char -> Word32
+c2w = toEnum . fromEnum
+w2c :: Word32 -> Char
+w2c = toEnum . fromEnum
 
 ------
 --- Haskell-to-C conversion
diff --git a/Data/Text/Glyphize/Font.hs b/Data/Text/Glyphize/Font.hs
--- a/Data/Text/Glyphize/Font.hs
+++ b/Data/Text/Glyphize/Font.hs
@@ -5,11 +5,11 @@
 import Data.ByteString (packCStringLen)
 import Data.Word (Word8, Word32)
 import Data.Int (Int32)
-import FreeType.Core.Base (FT_Face, frSize)
-import Data.Text.Glyphize.Buffer (tag_to_string, tag_from_string, Direction, dir2int)
+import FreeType.Core.Base (FT_Face)
+import Data.Text.Glyphize.Buffer (tag_to_string, tag_from_string, Direction, dir2int,
+                                c2w, w2c)
 
 import Control.Monad (forM, unless)
-import Codec.Binary.UTF8.Light (w2c, c2w)
 import Data.Maybe (fromMaybe)
 
 import System.IO.Unsafe (unsafePerformIO)
diff --git a/harfbuzz-pure.cabal b/harfbuzz-pure.cabal
--- a/harfbuzz-pure.cabal
+++ b/harfbuzz-pure.cabal
@@ -10,7 +10,7 @@
 -- PVP summary:      +-+------- breaking API changes
 --                   | | +----- non-breaking API additions
 --                   | | | +--- code changes with no API change
-version:             1.0.0.0
+version:             1.0.0.1
 
 -- A short (one-line) description of the package.
 synopsis:            Pure-functional Harfbuzz language bindings
@@ -60,7 +60,7 @@
   -- other-extensions:    
   
   -- Other library packages from which modules are imported.
-  build-depends:       base >=4.12 && <4.13, text >= 2.0 && < 3, utf8-light >= 0.4 && < 0.5,
+  build-depends:       base >=4.12 && <4.13, text >= 2.0 && < 3,
                        bytestring >= 0.11, freetype2 >= 0.2, derive-storable >= 0.3 && < 1
   pkgconfig-depends:   harfbuzz