diff --git a/Numeric/NumType/DK/Integers.hs b/Numeric/NumType/DK/Integers.hs
--- a/Numeric/NumType/DK/Integers.hs
+++ b/Numeric/NumType/DK/Integers.hs
@@ -3,6 +3,7 @@
 {-# LANGUAGE AutoDeriveTypeable #-}
 {-# LANGUAGE CPP #-}
 {-# LANGUAGE DataKinds #-}
+{-# LANGUAGE FlexibleContexts #-}
 {-# LANGUAGE FlexibleInstances #-}
 {-# LANGUAGE TypeFamilies #-}
 {-# LANGUAGE TypeOperators #-}
diff --git a/numtype-dk.cabal b/numtype-dk.cabal
--- a/numtype-dk.cabal
+++ b/numtype-dk.cabal
@@ -1,13 +1,13 @@
 name:                numtype-dk
-version:             0.5.0.2
+version:             0.5.0.3
 license:             BSD3
 license-File:        LICENSE
-copyright:           Bjorn Buckwalter 2012-2015
+copyright:           Bjorn Buckwalter 2012-2021
 author:              Bjorn Buckwalter
 maintainer:          bjorn@buckwalter.se
 category:            Math
 stability:           provisional
-cabal-version:       >= 1.6
+cabal-version:       >= 1.10
 build-type:          Simple
 homepage:            https://github.com/bjornbm/numtype-dk
 synopsis:            Type-level integers, using TypeNats, Data
@@ -33,6 +33,7 @@
   location: https://github.com/bjornbm/numtype-dk/
 
 library
+  default-language:    Haskell98
   build-depends:       base < 5
   exposed-modules:     Numeric.NumType.DK.Integers
   other-modules:       Numeric.NumType.DK.Naturals