diff --git a/app/Main.hs b/app/Main.hs
--- a/app/Main.hs
+++ b/app/Main.hs
@@ -7,13 +7,15 @@
     ( main
     ) where
 
-import           Control.Monad   (zipWithM)
-import qualified Data.Text.IO    as TIO
-import           GHC.Generics    (Generic)
+import           Control.Applicative
+import           Control.Monad
+import qualified Data.Text.IO        as TIO
+import           Data.Traversable    (traverse)
+import           GHC.Generics        (Generic)
 import           Options.Generic
-import           System.Exit     (ExitCode (..), exitWith)
-import           Text.Megaparsec (parseErrorPretty)
-import           Text.Toml       (parseTomlDoc)
+import           System.Exit         (ExitCode (..), exitWith)
+import           Text.Megaparsec     (parseErrorPretty)
+import           Text.Toml           (parseTomlDoc)
 
 newtype Program = Program { file :: [FilePath] <?> "Path to file to be checked." }
     deriving (Generic)
diff --git a/stack.yaml b/stack.yaml
--- a/stack.yaml
+++ b/stack.yaml
@@ -1,8 +1,4 @@
 ---
-resolver: lts-11.4
-packages:
-  - './'
+resolver: lts-11.7
 extra-deps:
-  - htoml-megaparsec-1.1.0.3
-  - composition-prelude-1.3.0.8
-extra-package-dbs: []
+  - htoml-megaparsec-1.1.0.4
diff --git a/tomlcheck.cabal b/tomlcheck.cabal
--- a/tomlcheck.cabal
+++ b/tomlcheck.cabal
@@ -1,6 +1,6 @@
 cabal-version: 1.18
 name: tomlcheck
-version: 0.1.0.23
+version: 0.1.0.29
 license: BSD3
 license-file: LICENSE
 copyright: Copyright: (c) 2017-2018 Vanessa McHale
@@ -34,7 +34,7 @@
     default-language: Haskell2010
     ghc-options: -Wall
     build-depends:
-        base >=4.8 && <5,
+        base >=4.7 && <5,
         htoml-megaparsec >=1.0.1.11,
         optparse-generic -any,
         megaparsec >=6.0,
@@ -45,3 +45,6 @@
     
     if impl(ghc >=8.0)
         ghc-options: -Wincomplete-uni-patterns -Wincomplete-record-updates
+    
+    if impl(ghc >=8.4)
+        ghc-options: -Wmissing-export-lists