diff --git a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -1,4 +1,6 @@
 sign
 ====
 
+[![Build Status](https://secure.travis-ci.org/msakai/sign.png?branch=master)](http://travis-ci.org/msakai/sign)
+
 Arithmetic over signs (i.e. {-,0,+}) and sets of signs
diff --git a/sign.cabal b/sign.cabal
--- a/sign.cabal
+++ b/sign.cabal
@@ -1,5 +1,5 @@
 Name:		sign
-Version:	0.2.0
+Version:	0.3.0
 License:	BSD3
 License-File:	LICENSE
 Author:		Masahiro Sakai (masahiro.sakai@gmail.com)
@@ -7,7 +7,12 @@
 Category:	Data, Math, Algebra
 Cabal-Version:	>= 1.10
 Synopsis:	Arithmetic over signs and sets of signs
-Description:    Arithmetic over signs (i.e. -, 0, +) and sets of signs
+Description:
+   Arithmetic over signs (i.e. -, 0, +) and sets of signs
+   .
+   Changes in 0.3.0
+   .
+   * avoid dependency issue of comonad-4.* and representable-functors-3.2.0.1
 Bug-Reports:	https://github.com/msakai/sign/issues
 Extra-Source-Files:
    README.md
@@ -22,7 +27,9 @@
 Library
   Hs-source-dirs: src
   Build-Depends:
-     base >=4 && <5, containers >= 0.4.2, deepseq, hashable >=1.1.2.5 && <1.3.0.0, lattices >=1.2.1.1, algebra
+     base >=4 && <5, containers >= 0.4.2, deepseq, hashable >=1.1.2.5 && <1.3.0.0, lattices >=1.2.1.1, algebra,
+     -- XXX: This is a hack to avoid combining comonad-4.* and representable-functors-3.2.0.1 when compiling algebra package.
+     representable-functors >=3.2.0.2
   Default-Language: Haskell2010
   Other-Extensions:
      FlexibleInstances