diff --git a/coroutine-object.cabal b/coroutine-object.cabal
--- a/coroutine-object.cabal
+++ b/coroutine-object.cabal
@@ -1,17 +1,18 @@
 Name:		coroutine-object
-Version:	0.2
+Version:	0.2.0
 Synopsis:       Object-oriented programming realization using coroutine 
 Description: 	Object-oriented programming realization using coroutine 
 License: 	BSD3
 License-file:	LICENSE
 Author:		Ian-Woo Kim
 Maintainer: 	Ian-Woo Kim <ianwookim@gmail.com>
+Category:       Control
 Build-Type: 	Simple
 Cabal-Version:  >= 1.8
 data-files:      
 Library
   hs-source-dirs: src
-  ghc-options: 	-Wall -O2 -threaded -funbox-strict-fields -fno-warn-unused-do-bind -fno-warn-orphans
+  ghc-options: 	-Wall -funbox-strict-fields -fno-warn-unused-do-bind -fno-warn-orphans
   ghc-prof-options: -caf-all -auto-all
   Build-Depends:   base >4 && <5, 
                    mtl>2, 
@@ -23,7 +24,7 @@
                    safecopy >= 0.6,
                    uuid == 1.2.*,
                    cereal == 0.3.*, 
-                   either >= 3 
+                   either >= 3.1 
                    -- errors >= 1.3
   Other-Modules:   
   exposed-modules: