diff --git a/app/Main.hs b/app/Main.hs
index 0b34651..321bdbb 100644
--- a/app/Main.hs
+++ b/app/Main.hs
@@ -1,9 +1,4 @@
-{-# LANGUAGE ApplicativeDo              #-}
-{-# LANGUAGE BlockArguments             #-}
-{-# LANGUAGE CPP                        #-}
-{-# LANGUAGE DuplicateRecordFields      #-}
-{-# LANGUAGE OverloadedStrings          #-}
-{-# LANGUAGE RecordWildCards            #-}
+{-# LANGUAGE CPP #-}
 
 module Main where
 
diff --git a/nix-diff.cabal b/nix-diff.cabal
index 1bd7014..84381b9 100644
--- a/nix-diff.cabal
+++ b/nix-diff.cabal
@@ -1,3 +1,4 @@
+cabal-version:       3.0
 name:                nix-diff
 version:             1.0.20
 synopsis:            Explain why two Nix derivations differ
@@ -5,25 +6,46 @@ description:         This package provides a @nix-diff@ executable which
                      explains why two Nix derivations (i.e. @*.drv@ files)
                      differ
 homepage:            https://github.com/Gabriella439/nix-diff
-license:             BSD3
+license:             BSD-3-Clause
 license-file:        LICENSE
 author:              Gabriella Gonzalez
 maintainer:          GenuineGabriella@gmail.com
-copyright:           2017 Gabriella Gonzalez
+copyright:           2024 Gabriella Gonzalez
 category:            System
 build-type:          Simple
-tested-with:         GHC == 8.10.7, GHC == 9.0.2, GHC == 9.2.5, GHC == 9.4.4
-cabal-version:       >= 1.10
+tested-with:         GHC == 9.2.8,
+                     GHC == 9.4.7,
+                     GHC == 9.6.3
 extra-source-files:  README.md
                      CHANGELOG.md
 
+common language
+  default-language:    GHC2021
+  default-extensions:
+    ApplicativeDo,
+    BlockArguments,
+    DeriveAnyClass,
+    DerivingStrategies,
+    DerivingVia,
+    DuplicateRecordFields,
+    LambdaCase,
+    MultiWayIf,
+    NamedFieldPuns,
+    OverloadedStrings,
+    RecordWildCards,
+  ghc-options:         -Wall
+
 library
+  import: language
+  hs-source-dirs:      src
+
   exposed-modules:
     Nix.Diff
     Nix.Diff.Store
     Nix.Diff.Types
     Nix.Diff.Transformations
     Nix.Diff.Render.HumanReadable
+
   build-depends:       base                 >= 4.9      && < 5
                      , attoparsec           >= 0.13     && < 0.15
                      , aeson
@@ -42,11 +64,10 @@ library
                      , quickcheck-instances                < 3.29
                      , generic-arbitrary                   < 1.1
                      , uniplate                            < 1.17
-  hs-source-dirs:      src
-  default-language:    Haskell2010
-  ghc-options:         -Wall
 
 executable nix-diff
+  import: language
+  hs-source-dirs:      app
   main-is:             Main.hs
 
   build-depends:       base
@@ -58,11 +79,12 @@ executable nix-diff
                      , unix                                < 2.9
                      , containers
                      , mtl
-  hs-source-dirs:      app
-  default-language:    Haskell2010
-  ghc-options:         -Wall
 
 test-suite nix-diff-test
+  import: language
+  ghc-options:         -Wall
+
+  hs-source-dirs:      test
   main-is:             Main.hs
 
   other-modules:
@@ -83,8 +105,3 @@ test-suite nix-diff-test
                      , tasty             < 1.6
                      , tasty-quickcheck  < 0.11
                      , tasty-silver      < 3.4
-
-  hs-source-dirs:      test
-
-  default-language:    Haskell2010
-  ghc-options:         -Wall
diff --git a/src/Nix/Diff.hs b/src/Nix/Diff.hs
index ca75b4a..5ddd0dd 100644
--- a/src/Nix/Diff.hs
+++ b/src/Nix/Diff.hs
@@ -1,11 +1,4 @@
-{-# LANGUAGE ApplicativeDo              #-}
-{-# LANGUAGE BlockArguments             #-}
-{-# LANGUAGE CPP                        #-}
-{-# LANGUAGE GeneralizedNewtypeDeriving #-}
-{-# LANGUAGE LambdaCase                 #-}
-{-# LANGUAGE NamedFieldPuns             #-}
-{-# LANGUAGE OverloadedStrings          #-}
-{-# LANGUAGE RecordWildCards            #-}
+{-# LANGUAGE CPP #-}
 
 module Nix.Diff where
 
@@ -23,7 +16,6 @@ import Data.Vector (Vector)
 import Nix.Derivation (Derivation, DerivationOutput)
 import Prelude hiding (unzip)
 
-import qualified Control.Monad.Reader
 import qualified Data.Attoparsec.Text
 import qualified Data.ByteString
 import qualified Data.Char            as Char
@@ -66,7 +58,7 @@ data Diffed = Diffed
     } deriving (Eq, Ord)
 
 newtype Diff a = Diff { unDiff :: ReaderT DiffContext (StateT Status IO) a }
-    deriving
+    deriving newtype
     ( Functor
     , Applicative
     , Monad
diff --git a/src/Nix/Diff/Render/HumanReadable.hs b/src/Nix/Diff/Render/HumanReadable.hs
index 1e9199a..93dae72 100644
--- a/src/Nix/Diff/Render/HumanReadable.hs
+++ b/src/Nix/Diff/Render/HumanReadable.hs
@@ -1,12 +1,4 @@
-{-# LANGUAGE ApplicativeDo              #-}
-{-# LANGUAGE BlockArguments             #-}
-{-# LANGUAGE CPP                        #-}
-{-# LANGUAGE DuplicateRecordFields      #-}
-{-# LANGUAGE GeneralizedNewtypeDeriving #-}
-{-# LANGUAGE LambdaCase                 #-}
-{-# LANGUAGE NamedFieldPuns             #-}
-{-# LANGUAGE OverloadedStrings          #-}
-{-# LANGUAGE RecordWildCards            #-}
+{-# LANGUAGE CPP #-}
 
 module Nix.Diff.Render.HumanReadable where
 
@@ -39,7 +31,7 @@ data RenderContext = RenderContext
   }
 
 newtype Render a = Render { unRender :: ReaderT RenderContext (Writer Text) a}
-    deriving
+    deriving newtype
     ( Functor
     , Applicative
     , Monad
diff --git a/src/Nix/Diff/Store.hs b/src/Nix/Diff/Store.hs
index d785abc..7e6342a 100644
--- a/src/Nix/Diff/Store.hs
+++ b/src/Nix/Diff/Store.hs
@@ -1,9 +1,3 @@
-{-# LANGUAGE DeriveDataTypeable #-}
-{-# LANGUAGE DerivingStrategies #-}
-{-# LANGUAGE GeneralisedNewtypeDeriving #-}
-{-# LANGUAGE UndecidableInstances #-}
-{-# LANGUAGE NoImportQualifiedPost #-}
-
 -- | A crude implementation of the Nix store concept.
 --
 -- For anything fancier than this, it would be best to use FFI bindings instead,
diff --git a/src/Nix/Diff/Transformations.hs b/src/Nix/Diff/Transformations.hs
index 0ba0020..476aef5 100644
--- a/src/Nix/Diff/Transformations.hs
+++ b/src/Nix/Diff/Transformations.hs
@@ -1,9 +1,3 @@
-{-# LANGUAGE RecordWildCards #-}
-{-# LANGUAGE LambdaCase #-}
-{-# LANGUAGE NamedFieldPuns #-}
-{-# LANGUAGE MultiWayIf #-}
-{-# LANGUAGE BlockArguments #-}
-{-# LANGUAGE FlexibleContexts #-}
 module Nix.Diff.Transformations where
 
 import qualified Patience
diff --git a/src/Nix/Diff/Types.hs b/src/Nix/Diff/Types.hs
index 54fdfdc..3d5302a 100644
--- a/src/Nix/Diff/Types.hs
+++ b/src/Nix/Diff/Types.hs
@@ -1,15 +1,7 @@
-{-# LANGUAGE RecordWildCards            #-}
-{-# LANGUAGE OverloadedStrings          #-}
-{-# LANGUAGE DeriveAnyClass             #-}
-{-# LANGUAGE DeriveGeneric              #-}
-{-# LANGUAGE DeriveTraversable          #-}
-{-# LANGUAGE BlockArguments             #-}
-{-# LANGUAGE DerivingVia                #-}
-{-# LANGUAGE DeriveDataTypeable         #-}
-{-# LANGUAGE StandaloneDeriving         #-}
-{-# LANGUAGE FlexibleInstances          #-}
-{-# LANGUAGE GeneralizedNewtypeDeriving #-}
-{-# OPTIONS_GHC -Wno-orphans -fconstraint-solver-iterations=0 #-}
+-- Needed for `deriving Arbitrary via GenericArbitrary DerivationDiff`:
+{-# OPTIONS_GHC -fconstraint-solver-iterations=0 #-}
+-- Needed for `deriving instance Data (DerivationOutput StorePath Text)`:
+{-# OPTIONS_GHC -Wno-orphans #-}
 
 module Nix.Diff.Types where
 
diff --git a/test/Golden/Tests.hs b/test/Golden/Tests.hs
index c1bd3c3..6fd4e2d 100644
--- a/test/Golden/Tests.hs
+++ b/test/Golden/Tests.hs
@@ -1,4 +1,3 @@
-{-# LANGUAGE OverloadedStrings #-}
 module Golden.Tests where
 
 import qualified Data.Aeson
diff --git a/test/Golden/Utils.hs b/test/Golden/Utils.hs
index 681a4de..974038b 100644
--- a/test/Golden/Utils.hs
+++ b/test/Golden/Utils.hs
@@ -1,6 +1,3 @@
-{-# LANGUAGE RecordWildCards #-}
-{-# LANGUAGE OverloadedStrings #-}
-
 module Golden.Utils where
 
 import qualified Data.ByteString.Lazy.Char8 as BS