diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+0.1.1.1
+=======
+
+*   Add `NFData` instance for `LogPolicy`.
+
 0.1.1
 =====
 
diff --git a/src/System/Logger/Types.hs b/src/System/Logger/Types.hs
--- a/src/System/Logger/Types.hs
+++ b/src/System/Logger/Types.hs
@@ -172,6 +172,8 @@
     | LogPolicyBlock
     deriving (Show, Read, Eq, Ord, Bounded, Enum, Typeable, Generic)
 
+instance NFData LogPolicy
+
 logPolicyText ∷ IsString s ⇒ LogPolicy → s
 logPolicyText LogPolicyDiscard = "discard"
 logPolicyText LogPolicyRaise = "raise"
@@ -488,26 +490,26 @@
 -- MonadLogIO
 
 instance (MonadLog a (ReaderT σ m), MonadLogIO a m) ⇒ MonadLogIO a (ReaderT σ m) where
-    logFunIO= lift logFunIO
+    logFunIO = lift logFunIO
     {-# INLINE logFunIO #-}
 
 instance (Monoid σ, MonadLogIO a m) ⇒ MonadLogIO a (WriterT σ m) where
-    logFunIO= lift logFunIO
+    logFunIO = lift logFunIO
     {-# INLINE logFunIO #-}
 
 instance (MonadLogIO a m) ⇒ MonadLogIO a (ExceptT ε m) where
-    logFunIO= lift logFunIO
+    logFunIO = lift logFunIO
     {-# INLINE logFunIO #-}
 
 instance (MonadLogIO a m) ⇒ MonadLogIO a (StateT σ m) where
-    logFunIO= lift logFunIO
+    logFunIO = lift logFunIO
     {-# INLINE logFunIO #-}
 
 instance (MonadLogIO a m) ⇒ MonadLogIO a (TraceT t e m) where
-    logFunIO= lift logFunIO
+    logFunIO = lift logFunIO
     {-# INLINE logFunIO #-}
 
 instance (MonadLogIO a m) ⇒ MonadLogIO a (EitherT σ m) where
-    logFunIO= lift logFunIO
+    logFunIO = lift logFunIO
     {-# INLINE logFunIO #-}
 
diff --git a/yet-another-logger.cabal b/yet-another-logger.cabal
--- a/yet-another-logger.cabal
+++ b/yet-another-logger.cabal
@@ -1,5 +1,5 @@
 Name: yet-another-logger
-Version: 0.1.1
+Version: 0.1.1.1
 Synopsis: Yet Another Logger
 Description:
     A logging framework written with flexibility and performance
@@ -73,7 +73,7 @@
     type: git
     location: https://github.com/alephcloud/hs-yet-another-logger
     branch: master
-    tag: 0.1.1
+    tag: 0.1.1.1
 
 Library
     default-language: Haskell2010