diff --git a/Text/IDNA.hs b/Text/IDNA.hs
--- a/Text/IDNA.hs
+++ b/Text/IDNA.hs
@@ -4,8 +4,7 @@
 where
 
 import Text.StringPrep
-import Text.NamePrep
-import Control.Monad
+import Text.StringPrep.Profiles
 import qualified Data.Text as Text
 import Data.Text (Text)
 import qualified Data.Text.Punycode as Puny
@@ -34,13 +33,14 @@
 					then Nothing
 					else case return (Puny.encode step3) of -- TODO: this can fail?
 						Left _ -> Nothing
-						Right t -> return $ acePrefix `Text.append` E.decodeUtf8 t
+						Right t' -> return $ acePrefix `Text.append` E.decodeUtf8 t'
 				else return step3
 		
 		if Text.length step7 <= 63
 			then return step7
 			else Nothing
 
+isLDHascii :: Char -> Bool
 isLDHascii c =
 	'\x0' <= c && c <= '\x2c' ||
 	'\x2e' <= c && c <= '\x2f' ||
@@ -70,7 +70,7 @@
 
 	case toASCII allowUnassigned useSTD3ASCIIRules step5 of
 		Nothing -> return step3
-		Just t -> if t == step3
+		Just t' -> if t' == step3
 			then return step5
 			else return step3
 
diff --git a/idna.cabal b/idna.cabal
--- a/idna.cabal
+++ b/idna.cabal
@@ -1,5 +1,5 @@
 Name: idna
-Version: 0.2
+Version: 0.3.0
 Description: Implements IDNA - Internationalized Domain Names in Applications (RFC 3490).
 Synopsis: Implements IDNA (RFC 3490).
 License: BSD3
@@ -11,10 +11,15 @@
 Category: Data, Text, RFC
 
 Library
- Build-Depends: base >= 4.3 && < 5, stringprep>=0.1.2, text>=0.1, punycode>=2.0
+ Build-Depends: base >= 4.3 && < 5, stringprep >=1 && < 2, text>=0.1, punycode>=2.0
  Exposed-modules: Text.IDNA
  ghc-options: -O2 -Wall
 
 source-repository head
     type: git
-    location: https://github.com/Porges/idna-hs
+    location: https://github.com/Porges/idna-hs.git
+
+source-repository this
+    type: git
+    location: https://github.com/Porges/idna-hs.git
+    tag: v0.3.0