diff --git a/Main.hs b/Main.hs
--- a/Main.hs
+++ b/Main.hs
@@ -1,23 +1,11 @@
 module Main where
 
 import Prelude hiding (catch)
-import Control.Exception ( SomeException(..),
-                           AsyncException(..),
-                           catch, handle, throw)
-import System.Posix.Signals
-import Control.Concurrent
-
-import Control.Applicative ((<$>), (<*>))
+import Control.Exception ( AsyncException(..), catch )
 import Control.Monad.Error
 
 import Data.Version
 import Data.List
-import Data.ByteString.Lazy (ByteString)
-import Data.ByteString.Lazy.Char8 ()
-import qualified Data.ByteString.Lazy.Char8 as B
-import Text.Parsec
-import Text.Parsec.ByteString.Lazy
-import Text.Regex.Posix
 
 import System.IO
 import System.Environment
@@ -26,6 +14,7 @@
 import System.Console.Haskeline hiding (handle, catch, throwTo)
 import System.Console.GetOpt
 import System.Exit (ExitCode (..), exitWith, exitFailure)
+
 import Language.Egison
 import Language.Egison.Util
 import qualified Paths_egison_tutorial as P
diff --git a/egison-tutorial.cabal b/egison-tutorial.cabal
--- a/egison-tutorial.cabal
+++ b/egison-tutorial.cabal
@@ -1,5 +1,5 @@
 Name:                egison-tutorial
-Version:             3.2.5
+Version:             3.2.6
 Synopsis:            A tutorial program for the programming language Egison
 Description:         A tutorial program for the programming language Egison.
                      Egison is the programming langugage that realized non-linear pattern-matching with unfree data types.
@@ -20,4 +20,4 @@
 
 Executable egison-tutorial
   Main-is:             Main.hs
-  Build-depends:       egison >= 3.2.18, base >= 4.0 && < 5, array, containers, unordered-containers, haskeline, transformers, mtl, parsec >= 3.0, directory, ghc, ghc-paths, filepath, regex-posix, strict-io, bytestring, unix
+  Build-depends:       egison >= 3.2.23, base >= 4.0 && < 5, array, containers, unordered-containers, haskeline, transformers, mtl, parsec >= 3.0, directory, ghc, ghc-paths, filepath, regex-posix, strict-io, bytestring