diff --git a/Egison.hs b/Egison.hs
--- a/Egison.hs
+++ b/Egison.hs
@@ -11,7 +11,7 @@
 main :: IO ()
 main = do args <- getArgs
           case length args of
-              0 -> do flushStr "Egison, version 0.1.2.2 : http://hagi.is.s.u-tokyo.ac.jp/~egi/egison/\nWelcome to Egison Interpreter!\n"
+              0 -> do flushStr "Egison, version 0.1.2.3 : http://hagi.is.s.u-tokyo.ac.jp/~egi/egison/\nWelcome to Egison Interpreter!\n"
                       defsRef <- newIORef []
                       runRepl defsRef
               _ -> putStrLn "Program takes only 0 argument!"
diff --git a/egison.cabal b/egison.cabal
--- a/egison.cabal
+++ b/egison.cabal
@@ -7,7 +7,7 @@
 -- The package version. See the Haskell package versioning policy
 -- (http://www.haskell.org/haskellwiki/Package_versioning_policy) for
 -- standards guiding when and how versions should be incremented.
-Version:             0.1.2.2
+Version:             0.1.2.3
 
 -- A short (one-line) description of the package.
 Synopsis:            An Interpreter for the Programming Language Egison
@@ -60,7 +60,7 @@
   Main-is:             Egison.hs
   
   -- Packages needed in order to build this package.
-  Build-depends:       base >= 4.0 && < 5, haskell98, mtl, parsec3
+  Build-depends:       base >= 4.0 && < 5, haskell98, mtl, parsec >= 3.0
   
   -- Modules not exported by this package.
   -- Other-modules: