diff --git a/LICENSE b/LICENSE
--- a/LICENSE
+++ b/LICENSE
@@ -1,4 +1,4 @@
-Copyright (c) 2017, Quixoftic, LLC
+Copyright (c) 2018, Quixoftic, LLC
 
 All rights reserved.
 
diff --git a/changelog.md b/changelog.md
--- a/changelog.md
+++ b/changelog.md
@@ -1,3 +1,15 @@
+## 0.8.0.5 (2018-02-04)
+
+Changes:
+
+  - This package now uses Protolude.
+
+  - Disable hlint tests by default.
+
+  - Add a `stack-lts-9.yaml` file for LTS 9 Stack builds.
+
+  - Pare down support to just GHC 8.0.2 and GHC 8.2.2.
+
 ## 0.8.0.4 (2018-01-26)
 
 - Require hlint 2.0.x.
diff --git a/mellon-gpio.cabal b/mellon-gpio.cabal
--- a/mellon-gpio.cabal
+++ b/mellon-gpio.cabal
@@ -2,10 +2,10 @@
 --
 -- see: https://github.com/sol/hpack
 --
--- hash: 5d0131e44b39a6d83e0f72ecd4cdd7e84764a20bb89537904b1bd6b9ead0ede4
+-- hash: 34cb673100a26e616e49cefa75525fb248fa592422e78a03ab2dd5bd9d4ee0a5
 
 name:                   mellon-gpio
-version:                0.8.0.4
+version:                0.8.0.5
 synopsis:               GPIO support for mellon
 description:            @mellon-gpio@ provides a GPIO-driven @mellon-core@ @Device@.
                         Currently, it provides support for Linux @sysfs@-based GPIO.
@@ -15,10 +15,10 @@
 bug-reports:            https://github.com/quixoftic/mellon/issues
 author:                 Drew Hess <dhess-src@quixoftic.com>
 maintainer:             Drew Hess <dhess-src@quixoftic.com>
-copyright:              Copyright (c) 2017, Quixoftic, LLC
+copyright:              Copyright (c) 2018, Quixoftic, LLC
 license:                BSD3
 license-file:           LICENSE
-tested-with:            GHC==7.10.3 GHC==8.0.1 GHC==8.0.2 GHC==8.2.1 GHC==8.2.2
+tested-with:            GHC==8.0.2 GHC==8.2.2
 build-type:             Simple
 cabal-version:          >= 1.10
 
@@ -34,15 +34,17 @@
 flag test-hlint
   description: Build hlint test
   manual: True
-  default: True
+  default: False
 
 library
   hs-source-dirs:
       src
+  default-extensions: NoImplicitPrelude
   build-depends:
       base >=4.8 && <5
     , hpio >=0.8 && <1
-    , mellon-core ==0.8.*
+    , mellon-core
+    , protolude ==0.2.*
   if impl(ghc >= 8.0)
     ghc-options: -Wall -Wincomplete-uni-patterns -Wincomplete-record-updates
   else
@@ -64,6 +66,7 @@
   main-is: hlint.hs
   hs-source-dirs:
       test
+  default-extensions: NoImplicitPrelude
   ghc-options: -w -threaded -rtsopts -with-rtsopts=-N
   if impl(ghc >= 8.0)
     ghc-options: -Wall -Wincomplete-uni-patterns -Wincomplete-record-updates
@@ -75,4 +78,5 @@
     build-depends:
         base
       , hlint ==2.0.*
+      , protolude
   default-language: Haskell2010
diff --git a/package.yaml b/package.yaml
--- a/package.yaml
+++ b/package.yaml
@@ -1,11 +1,11 @@
 name:       mellon-gpio
-version:    0.8.0.4
+version:    0.8.0.5
 synopsis:   GPIO support for mellon
 category:   System
 stability:  experimental
 author:     Drew Hess <dhess-src@quixoftic.com>
 maintainer: Drew Hess <dhess-src@quixoftic.com>
-copyright:  Copyright (c) 2017, Quixoftic, LLC
+copyright:  Copyright (c) 2018, Quixoftic, LLC
 license:    BSD3
 github:     quixoftic/mellon
 
@@ -13,13 +13,13 @@
 
   Currently, it provides support for Linux @sysfs@-based GPIO.'
 
-tested-with: GHC==7.10.3 GHC==8.0.1 GHC==8.0.2 GHC==8.2.1 GHC==8.2.2
+tested-with: GHC==8.0.2 GHC==8.2.2
 
 flags:
   test-hlint:
     description: Build hlint test
     manual: true
-    default: true
+    default: false
 
 when:
   - condition: impl(ghc >= 8.0)
@@ -34,6 +34,9 @@
         - -fwarn-incomplete-uni-patterns
         - -fwarn-incomplete-record-updates
 
+default-extensions:
+  - NoImplicitPrelude
+
 library:
   when:
     - condition: impl(ghc >= 8.0)
@@ -51,7 +54,8 @@
   dependencies:
     - base        >=4.8 && <5
     - hpio        >=0.8 && <1
-    - mellon-core ==0.8.*
+    - mellon-core
+    - protolude   ==0.2.*
 
 tests:
   hlint:
@@ -71,6 +75,7 @@
           dependencies:
             - base
             - hlint ==2.0.*
+            - protolude
 
 extra-source-files:
 - changelog.md
diff --git a/src/Mellon/Device/GPIO.hs b/src/Mellon/Device/GPIO.hs
--- a/src/Mellon/Device/GPIO.hs
+++ b/src/Mellon/Device/GPIO.hs
@@ -1,7 +1,7 @@
 {-|
 Module      : Mellon.Device.GPIO
 Description : GPIO-driven @mellon-core@ devices
-Copyright   : (c) 2017, Quixoftic, LLC
+Copyright   : (c) 2018, Quixoftic, LLC
 License     : BSD3
 Maintainer  : Drew Hess <dhess-src@quixoftic.com>
 Stability   : experimental
@@ -14,6 +14,7 @@
            sysfsGpioDevice
          ) where
 
+import Protolude
 import Mellon.Device (Device(..))
 import System.GPIO.Monad (PinValue(..), OutputPin, writeOutputPin)
 import System.GPIO.Linux.Sysfs (PinDescriptor, runSysfsGpioIO)
diff --git a/test/hlint.hs b/test/hlint.hs
--- a/test/hlint.hs
+++ b/test/hlint.hs
@@ -1,9 +1,8 @@
 module Main where
 
+import Protolude
 import Control.Monad (unless)
 import Language.Haskell.HLint
-import System.Environment
-import System.Exit
 
 main :: IO ()
 main =