diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,3 +1,7 @@
+# 0.5.2.0
+
+  * icorporate MonadFail
+
 # 0.5.1.0
 
   * add @UsingEnumText@ wrapper type and instances for
diff --git a/enum-text.cabal b/enum-text.cabal
--- a/enum-text.cabal
+++ b/enum-text.cabal
@@ -1,13 +1,13 @@
 cabal-version: 1.12
 
--- This file has been generated from package.yaml by hpack version 0.31.1.
+-- This file has been generated from package.yaml by hpack version 0.31.2.
 --
 -- see: https://github.com/sol/hpack
 --
--- hash: aa4522c3c0e28379109cad28a0f168141981649e20d845d6327e43f08f4c8024
+-- hash: fc466a91bf6e816562e629c30f60ef63336e95b83a88815f1cb6336d76619511
 
 name:           enum-text
-version:        0.5.1.0
+version:        0.5.2.0
 synopsis:       A text rendering and parsing toolkit for enumerated types
 description:    A text rendering and parsing toolkit for enumerated types. Please see the README on GitHub at <https://github.com/cdornan/enum-text#readme>
 category:       Text
@@ -37,7 +37,7 @@
   ghc-options: -Wall
   build-depends:
       array
-    , base >=4.8.2 && <10
+    , base >=4.9 && <10
     , bytestring
     , fmt
     , hashable
diff --git a/src/Text/Enum/Text.hs b/src/Text/Enum/Text.hs
--- a/src/Text/Enum/Text.hs
+++ b/src/Text/Enum/Text.hs
@@ -3,6 +3,7 @@
 {-# LANGUAGE RecordWildCards      #-}
 {-# LANGUAGE ScopedTypeVariables  #-}
 {-# LANGUAGE LambdaCase           #-}
+{-# OPTIONS_GHC -fno-warn-unused-imports #-}
 
 module Text.Enum.Text
   ( EnumText(..)
@@ -12,6 +13,7 @@
   , defaultEnumTextConfig
   ) where
 
+import           Control.Monad.Fail
 import           Data.Array
 import qualified Data.ByteString.Char8          as B
 import           Data.Coerce
@@ -91,7 +93,7 @@
   toFieldEnumText e = enumByteStringArray ! I e
 
   -- | A cassava field parser using the 'renderEnumText' format.
-  fromFieldEnumText_ :: Monad m => B.ByteString -> m e
+  fromFieldEnumText_ :: MonadFail m => B.ByteString -> m e
   fromFieldEnumText_ bs = maybe (fail msg) return $ HM.lookup bs hashmap_b
     where
       msg = "fromFieldEnumText_: enumeration not recognised: "++show bs