diff --git a/Algebra/Ring/Polynomial.hs b/Algebra/Ring/Polynomial.hs
--- a/Algebra/Ring/Polynomial.hs
+++ b/Algebra/Ring/Polynomial.hs
@@ -29,7 +29,6 @@
 import           Numeric.Algebra
 import           Prelude                 hiding (lex, (*), (+), (-), (^), (^^), recip, negate)
 import qualified Prelude                 as P
-import Data.Hashable
 
 -- | N-ary Monomial. IntMap contains degrees for each x_i.
 type Monomial (n :: Nat) = Vector Int n
diff --git a/computational-algebra.cabal b/computational-algebra.cabal
--- a/computational-algebra.cabal
+++ b/computational-algebra.cabal
@@ -2,7 +2,7 @@
 -- further documentation, see http://haskell.org/cabal/users-guide/
 
 name:                computational-algebra
-version:             0.0.1.0
+version:             0.0.1.1
 synopsis:            Well-kinded computational algebra library, currently supporting Groebner basis.
 description:         Dependently-typed computational algebra libray for Groebner basis.
 homepage:            https://github.com/konn/computational-algebra