diff --git a/.hlint.yaml b/.hlint.yaml
new file mode 100644
index 000000000..7d65e6170
--- /dev/null
+++ b/.hlint.yaml
@@ -0,0 +1,6 @@
+# Ignore some builtin hints
+- ignore:
+    name: "Reduce duplication"
+    within:
+      - Data.Aeson.Types.ToJSON
+- ignore: {name: "Eta reduce" }
diff --git a/Data/Aeson/Parser/Internal.hs b/Data/Aeson/Parser/Internal.hs
index c7e97b002..d3327ce71 100644
--- a/Data/Aeson/Parser/Internal.hs
+++ b/Data/Aeson/Parser/Internal.hs
@@ -41,6 +41,7 @@ import Control.Applicative ((<|>))
 import Control.Monad (void, when)
 import Data.Aeson.Types.Internal (IResult(..), JSONPath, Result(..), Value(..))
 import Data.Attoparsec.ByteString.Char8 (Parser, char, decimal, endOfInput, isDigit_w8, signed, string)
+import Data.Functor.Compat (($>))
 import Data.Scientific (Scientific)
 import Data.Text (Text)
 import Data.Vector as Vector (Vector, empty, fromListN, reverse)
@@ -174,9 +175,9 @@ value = do
     DOUBLE_QUOTE  -> A.anyWord8 *> (String <$> jstring_)
     OPEN_CURLY    -> A.anyWord8 *> object_
     OPEN_SQUARE   -> A.anyWord8 *> array_
-    C_f           -> string "false" *> pure (Bool False)
-    C_t           -> string "true" *> pure (Bool True)
-    C_n           -> string "null" *> pure Null
+    C_f           -> string "false" $> Bool False
+    C_t           -> string "true" $> Bool True
+    C_n           -> string "null" $> Null
     _              | w >= 48 && w <= 57 || w == 45
                   -> Number <$> scientific
       | otherwise -> fail "not a valid json value"
@@ -192,9 +193,9 @@ value' = do
                      return (String s)
     OPEN_CURLY    -> A.anyWord8 *> object_'
     OPEN_SQUARE   -> A.anyWord8 *> array_'
-    C_f           -> string "false" *> pure (Bool False)
-    C_t           -> string "true" *> pure (Bool True)
-    C_n           -> string "null" *> pure Null
+    C_f           -> string "false" $> Bool False
+    C_t           -> string "true" $> Bool True
+    C_n           -> string "null" $> Null
     _              | w >= 48 && w <= 57 || w == 45
                   -> do
                      !n <- scientific
diff --git a/Data/Aeson/TH.hs b/Data/Aeson/TH.hs
index 8bb4081ab..487f7ba22 100644
--- a/Data/Aeson/TH.hs
+++ b/Data/Aeson/TH.hs
@@ -159,8 +159,6 @@ import qualified Data.Text as T (Text, pack, unpack)
 import qualified Data.Vector as V (unsafeIndex, null, length, create, empty)
 import qualified Data.Vector.Mutable as VM (unsafeNew, unsafeWrite)
 
-{-# ANN module "Hlint: ignore Reduce duplication" #-}
-
 --------------------------------------------------------------------------------
 -- Convenience
 --------------------------------------------------------------------------------
diff --git a/Data/Aeson/Types/Class.hs b/Data/Aeson/Types/Class.hs
index 5767dd783..9dd92bd5e 100644
--- a/Data/Aeson/Types/Class.hs
+++ b/Data/Aeson/Types/Class.hs
@@ -6,7 +6,6 @@
 {-# LANGUAGE MultiParamTypeClasses #-}
 {-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE ScopedTypeVariables #-}
-{-# LANGUAGE TypeSynonymInstances #-}
 
 -- |
 -- Module:      Data.Aeson.Types.Class
diff --git a/Data/Aeson/Types/FromJSON.hs b/Data/Aeson/Types/FromJSON.hs
index 47e124f83..a67673239 100644
--- a/Data/Aeson/Types/FromJSON.hs
+++ b/Data/Aeson/Types/FromJSON.hs
@@ -11,7 +11,6 @@
 {-# LANGUAGE RecordWildCards #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE TypeOperators #-}
-{-# LANGUAGE TypeSynonymInstances #-}
 {-# LANGUAGE UndecidableInstances #-}
 {-# LANGUAGE ViewPatterns #-}
 
diff --git a/Data/Aeson/Types/Generic.hs b/Data/Aeson/Types/Generic.hs
index 7d25afef0..fdf6c3dc8 100644
--- a/Data/Aeson/Types/Generic.hs
+++ b/Data/Aeson/Types/Generic.hs
@@ -5,7 +5,6 @@
 {-# LANGUAGE FlexibleInstances #-}
 {-# LANGUAGE FunctionalDependencies #-}
 {-# LANGUAGE KindSignatures #-}
-{-# LANGUAGE MultiParamTypeClasses #-}
 {-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE TypeOperators #-}
diff --git a/Data/Aeson/Types/ToJSON.hs b/Data/Aeson/Types/ToJSON.hs
index e11093726..6d93dee54 100644
--- a/Data/Aeson/Types/ToJSON.hs
+++ b/Data/Aeson/Types/ToJSON.hs
@@ -5,7 +5,6 @@
 {-# LANGUAGE FlexibleInstances #-}
 {-# LANGUAGE FunctionalDependencies #-}
 {-# LANGUAGE GADTs #-}
-{-# LANGUAGE MultiParamTypeClasses #-}
 {-# LANGUAGE NamedFieldPuns #-}
 {-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings #-}
@@ -13,7 +12,6 @@
 {-# LANGUAGE RecordWildCards #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE TypeOperators #-}
-{-# LANGUAGE TypeSynonymInstances #-}
 {-# LANGUAGE UndecidableInstances #-}
 
 #if __GLASGOW_HASKELL__ >= 706
@@ -147,8 +145,6 @@ import qualified Data.ByteString.Internal as S
 import qualified Data.ByteString.Lazy.Internal as L
 #endif
 
-{-# ANN module ("HLint: ignore Reduce duplication"::String) #-}
-
 toJSONPair :: (a -> Value) -> (b -> Value) -> (a, b) -> Value
 toJSONPair a b = liftToJSON2 a (listValue a) b (listValue b)
 {-# INLINE toJSONPair #-}
diff --git a/HLint.hs b/HLint.hs
deleted file mode 100644
index 390c8276b..000000000
--- a/HLint.hs
+++ /dev/null
@@ -1,12 +0,0 @@
-module HLint.HLint where
-
-import "hint" HLint.Default
-import "hint" HLint.Builtin.All
-import "hint" HLint.Dollar
-
-ignore "Avoid lambda"
-ignore "Eta reduce"
-ignore "Functor law"
-ignore "Use >=>"
-ignore "Use lambda-case"
-ignore "Use $>"
diff --git a/benchmarks/Compare/JsonBench.hs b/benchmarks/Compare/JsonBench.hs
index 907e2a2a4..f58a72f21 100644
--- a/benchmarks/Compare/JsonBench.hs
+++ b/benchmarks/Compare/JsonBench.hs
@@ -68,10 +68,10 @@ instance NFData Gender where rnf !_ = ()
 instance NFData Fruit where rnf !_ = ()
 
 instance NFData Friend where
-    rnf Friend {..} = rnf fId `seq` rnf fName `seq` ()
+    rnf Friend {..} = rnf fId `seq` rnf fName
 
 instance NFData User where
-    rnf User {..} = rnf uId `seq` rnf uIndex `seq` rnf uGuid `seq` rnf uIsActive `seq` rnf uBalance `seq` rnf uPicture `seq` rnf uAge `seq` rnf uEyeColor `seq` rnf uName `seq` rnf uGender `seq` rnf uCompany `seq` rnf uEmail `seq` rnf uPhone `seq` rnf uAddress `seq` rnf uAbout `seq` rnf uRegistered `seq` rnf uLatitude `seq` rnf uLongitude `seq` rnf uTags `seq` rnf uFriends `seq` rnf uGreeting `seq` rnf uFavouriteFruit `seq` ()
+    rnf User {..} = rnf uId `seq` rnf uIndex `seq` rnf uGuid `seq` rnf uIsActive `seq` rnf uBalance `seq` rnf uPicture `seq` rnf uAge `seq` rnf uEyeColor `seq` rnf uName `seq` rnf uGender `seq` rnf uCompany `seq` rnf uEmail `seq` rnf uPhone `seq` rnf uAddress `seq` rnf uAbout `seq` rnf uRegistered `seq` rnf uLatitude `seq` rnf uLongitude `seq` rnf uTags `seq` rnf uFriends `seq` rnf uGreeting `seq` rnf uFavouriteFruit
 
 eyeColorTable :: [(Text, EyeColor)]
 eyeColorTable = [("brown", Brown), ("green", Green), ("blue", Blue)]
diff --git a/benchmarks/CompareWithJSON.hs b/benchmarks/CompareWithJSON.hs
index 7c3e605e3..fa7903a04 100644
--- a/benchmarks/CompareWithJSON.hs
+++ b/benchmarks/CompareWithJSON.hs
@@ -27,7 +27,7 @@ instance (NFData v) => NFData (J.JSObject v) where
 instance NFData J.JSValue where
   rnf J.JSNull = ()
   rnf (J.JSBool b) = rnf b
-  rnf (J.JSRational a b) = rnf a `seq` rnf b `seq` ()
+  rnf (J.JSRational a b) = rnf a `seq` rnf b
   rnf (J.JSString s) = rnf (J.fromJSString s)
   rnf (J.JSArray lst) = rnf lst
   rnf (J.JSObject o) = rnf o
diff --git a/benchmarks/JsonParse.hs b/benchmarks/JsonParse.hs
index 6b746980e..cd1dd10f5 100644
--- a/benchmarks/JsonParse.hs
+++ b/benchmarks/JsonParse.hs
@@ -17,7 +17,7 @@ import Text.JSON
 instance NFData JSValue where
     rnf JSNull = ()
     rnf (JSBool b) = rnf b
-    rnf (JSRational b r) = rnf b `seq` rnf r `seq` ()
+    rnf (JSRational b r) = rnf b `seq` rnf r
     rnf (JSString s) = rnf (fromJSString s)
     rnf (JSArray vs) = rnf vs
     rnf (JSObject kvs) = rnf (fromJSObject kvs)
diff --git a/stack-lts12.yaml b/stack-lts12.yaml
index 78ec4181f..9db7f9482 100644
--- a/stack-lts12.yaml
+++ b/stack-lts12.yaml
@@ -1,4 +1,4 @@
-resolver: lts-12.10
+resolver: lts-12.26
 packages:
 - '.'
 - attoparsec-iso8601
diff --git a/stack-nightly.yaml b/stack-nightly.yaml
index b0eac1d84..19b3b2ffe 100644
--- a/stack-nightly.yaml
+++ b/stack-nightly.yaml
@@ -1,4 +1,4 @@
-resolver: nightly-2018-09-26
+resolver: nightly-2019-05-13
 packages:
 - '.'
 - attoparsec-iso8601
@@ -7,3 +7,5 @@ flags:
     fast: true
   attoparsec-iso8601:
     fast: true
+extra-deps:
+- hlint-2.1.18