diff --git a/ihaskell.cabal b/ihaskell.cabal
--- a/ihaskell.cabal
+++ b/ihaskell.cabal
@@ -7,7 +7,7 @@
 -- PVP summary:      +-+------- breaking API changes
 --                   | | +----- non-breaking API additions
 --                   | | | +--- code changes with no API change
-version:             0.4.2.0
+version:             0.4.3.0
 
 -- A short (one-line) description of the package.
 synopsis:            A Haskell backend kernel for the IPython project.
@@ -51,14 +51,13 @@
 library
   hs-source-dirs:      src
   default-language:    Haskell2010
-  ghc-options: -threaded
   build-depends:       
                        aeson                >=0.6 && < 0.9,
                        base                 >=4.6 && < 4.8,
                        base64-bytestring    >=1.0,
                        bytestring           >=0.10,
                        cereal               >=0.3,
-                       classy-prelude       >=0.9.2 && <0.10,
+                       classy-prelude       >=0.9.5 && <0.10,
                        mono-traversable     >=0.6 && < 0.7,
                        cmdargs              >=0.10,
                        containers           >=0.5,
diff --git a/profile/profile.tar b/profile/profile.tar
Binary files a/profile/profile.tar and b/profile/profile.tar differ
diff --git a/src/IHaskell/Eval/Completion.hs b/src/IHaskell/Eval/Completion.hs
--- a/src/IHaskell/Eval/Completion.hs
+++ b/src/IHaskell/Eval/Completion.hs
@@ -20,7 +20,7 @@
 import Data.List (nub, init, last, head, elemIndex)
 import Data.List.Split
 import Data.List.Split.Internals
-import Data.Maybe
+import Data.Maybe (fromJust)
 import Data.String.Utils (strip, startswith, endswith, replace)
 import qualified Data.String.Utils as StringUtils
 import System.Environment (getEnv)
@@ -141,7 +141,7 @@
       onlyImportDecl _ = Nothing
 
   -- Get all imports that we use.
-  imports <- catMaybes <$> map onlyImportDecl <$> getContext
+  imports <- ClassyPrelude.catMaybes <$> map onlyImportDecl <$> getContext
 
   -- Find the ones that have a qualified name attached.
   -- If this name isn't one of them, it already is the true name.
@@ -178,7 +178,7 @@
     = Empty
 
   -- When in a string, complete filenames.
-  | cursorInString line loc 
+  | cursorInString line loc
     = FilePath (getStringTarget lineUpToCursor) (getStringTarget lineUpToCursor)
 
   -- Complete module names in imports and elsewhere.
@@ -315,341 +315,3 @@
       visible = filter (not . isHidden) suggestions
       hidden  = filter isHidden suggestions
   return $ visible ++ hidden
-
--- Taken from @aavogt's language-popularity repo. 
--- Thanks Adam! (See RateLang.hs)
--- A list of language extensions with a metric of popularity.
---
---
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-  ,("DataKinds",0)
-  ,("TemplateHaskell",0)
-  ,("FunctionalDependencies",0)
-  ,("Rank2Types",0)
-   ]]
-
diff --git a/src/IHaskell/Eval/Lint.hs b/src/IHaskell/Eval/Lint.hs
--- a/src/IHaskell/Eval/Lint.hs
+++ b/src/IHaskell/Eval/Lint.hs
@@ -57,7 +57,7 @@
 lint blocks = do
   -- Initialize hlint settings
   initialized <- not <$> isEmptyMVar hlintSettings
-  when (not initialized) $ do
+  unless initialized $
     autoSettings >>= putMVar hlintSettings
 
   -- Get hlint settings
@@ -83,7 +83,7 @@
     Just whyNot -> Just Suggest {
       line = srcSpanStartLine $ ideaSpan idea,
       found = showSuggestion $ ideaFrom idea,
-      whyNot = showSuggestion $ whyNot,
+      whyNot = showSuggestion whyNot,
       severity = ideaSeverity idea,
       suggestion = ideaHint idea
   }
diff --git a/src/IHaskell/IPython.hs b/src/IHaskell/IPython.hs
--- a/src/IHaskell/IPython.hs
+++ b/src/IHaskell/IPython.hs
@@ -49,7 +49,7 @@
 -- This must be the same as the file in the profile.tar.
 -- The filename used is @profileVersionFile@.
 profileVersion :: String
-profileVersion = "0.3.0.5"
+profileVersion = "0.4.2.0"
 
 -- | Filename in the profile where the version ins kept.
 profileVersionFile :: FilePath
diff --git a/src/IHaskell/IPython/Message/UUID.hs b/src/IHaskell/IPython/Message/UUID.hs
--- a/src/IHaskell/IPython/Message/UUID.hs
+++ b/src/IHaskell/IPython/Message/UUID.hs
@@ -12,9 +12,6 @@
 import Data.Aeson
 import Data.UUID.V4 (nextRandom)
 
-import Text.Read as Read hiding (pfail, String)
-
-
 -- We use an internal string representation because for the purposes of
 -- IPython, it matters whether the letters are uppercase or lowercase and
 -- whether the dashes are present in the correct locations. For the
diff --git a/src/Main.hs b/src/Main.hs
--- a/src/Main.hs
+++ b/src/Main.hs
@@ -4,7 +4,7 @@
 module Main where
 
 -- Prelude imports.
-import ClassyPrelude  hiding (last, liftIO)
+import ClassyPrelude  hiding (last, liftIO, readChan, writeChan)
 import Prelude        (last, read)
 
 -- Standard library imports.