diff --git a/ChangeLog.md b/ChangeLog.md
new file mode 100644
--- /dev/null
+++ b/ChangeLog.md
@@ -0,0 +1,12 @@
+# Changelog for `OptDir`
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to the
+[Haskell Package Versioning Policy](https://pvp.haskell.org/).
+
+## 0.1.0.0
+
+* Drop support for `hashable <1.2`
+* Add `NFData` instance
diff --git a/OptDir.cabal b/OptDir.cabal
--- a/OptDir.cabal
+++ b/OptDir.cabal
@@ -1,5 +1,5 @@
 Name:           OptDir
-Version:        0.0.4
+Version:        0.1.0
 Cabal-Version:  >= 1.10
 License:        BSD3
 License-file:   LICENSE
@@ -12,13 +12,14 @@
 Build-Type:	Simple
 Extra-Source-Files:
    README.md
+   ChangeLog.md
 
 Source-Repository head
   type:     git
   location: git://github.com/msakai/haskell-optdir.git
 
 Library
-  Build-Depends:      base >=4 && <5, syb, hashable >=1.1.2.5
+  Build-Depends:      base >=4 && <5, syb, hashable >=1.2, deepseq >=1.4.4.0
   Hs-Source-Dirs:     src
   Exposed-Modules:    Data.OptDir
   Default-Language:   Haskell2010
diff --git a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 OptDir
 ======
 
-[![Build Status](https://travis-ci.org/msakai/haskell-optdir.svg?branch=master)](https://travis-ci.org/msakai/haskell-optdir)
+[![build](https://github.com/msakai/haskell-optdir/actions/workflows/build.yaml/badge.svg)](https://github.com/msakai/haskell-optdir/actions/workflows/build.yaml)
 [![Hackage](https://img.shields.io/hackage/v/OptDir.svg)](https://hackage.haskell.org/package/OptDir)
 [![License](https://img.shields.io/badge/License-BSD%203--Clause-blue.svg)](https://opensource.org/licenses/BSD-3-Clause)
 
diff --git a/src/Data/OptDir.hs b/src/Data/OptDir.hs
--- a/src/Data/OptDir.hs
+++ b/src/Data/OptDir.hs
@@ -20,6 +20,7 @@
     OptDir (..)
   ) where
 
+import Control.DeepSeq
 import Data.Ix
 import Data.Typeable
 import Data.Generics hiding (Generic)
@@ -34,31 +35,6 @@
   | OptMax -- ^ maximization
   deriving (Bounded, Enum, Eq, Data, Ord, Read, Show, Ix, Generic, Typeable)
 
-instance Hashable OptDir where hashWithSalt = hashUsing fromEnum
-
-#if !MIN_VERSION_hashable(1,2,0)
--- Copied from hashable-1.2.0.7:
--- Copyright   :  (c) Milan Straka 2010
---                (c) Johan Tibell 2011
---                (c) Bryan O'Sullivan 2011, 2012
+instance NFData OptDir where rnf = rwhnf
 
--- | Transform a value into a 'Hashable' value, then hash the
--- transformed value using the given salt.
---
--- This is a useful shorthand in cases where a type can easily be
--- mapped to another type that is already an instance of 'Hashable'.
--- Example:
---
--- > data Foo = Foo | Bar
--- >          deriving (Enum)
--- >
--- > instance Hashable Foo where
--- >     hashWithSalt = hashUsing fromEnum
-hashUsing :: (Hashable b) =>
-             (a -> b)           -- ^ Transformation function.
-          -> Int                -- ^ Salt.
-          -> a                  -- ^ Value to transform.
-          -> Int
-hashUsing f salt x = hashWithSalt salt (f x)
-{-# INLINE hashUsing #-}
-#endif
+instance Hashable OptDir where hashWithSalt = hashUsing fromEnum