diff --git a/.github/workflows/haskell.yml b/.github/workflows/haskell.yml
index e65a47d..2991f58 100644
--- a/.github/workflows/haskell.yml
+++ b/.github/workflows/haskell.yml
@@ -20,9 +20,13 @@ jobs:
         ghc: ["9.8.1", "9.6.3", "9.4.8", "9.2.8", "9.0.2", "8.10.7"]
         os: [ubuntu-latest, macOS-latest, windows-latest]
         exclude:
-        - os: windows-latest
-          ghc: "9.4.2"
-
+          - os: windows-latest
+            ghc: "9.4.2"
+          - os: macOS-latest
+            ghc: "9.0.2"
+          - os: macOS-latest
+            ghc: "8.10.7"
+  
     env:
       # Modify this value to "invalidate" the cabal cache.
       CABAL_CACHE_VERSION: "2024-01-05"
diff --git a/src/Test/Tasty/Discover/Internal/Config.hs b/src/Test/Tasty/Discover/Internal/Config.hs
index d53bb49..bdcc5ae 100644
--- a/src/Test/Tasty/Discover/Internal/Config.hs
+++ b/src/Test/Tasty/Discover/Internal/Config.hs
@@ -39,7 +39,7 @@ data Config = Config
   , noModuleSuffix      :: Bool              -- ^ <<<DEPRECATED>>>: suffix and look in all modules.
   , debug               :: Bool              -- ^ Debug the generated module.
   , treeDisplay         :: Bool              -- ^ Tree display for the test results table.
-  } deriving (Show)
+  } deriving stock (Show)
 
 -- | The default configuration
 defaultConfig :: FilePath -> Config
diff --git a/src/Test/Tasty/Discover/Internal/Driver.hs b/src/Test/Tasty/Discover/Internal/Driver.hs
index b6d64cf..e7c25e8 100644
--- a/src/Test/Tasty/Discover/Internal/Driver.hs
+++ b/src/Test/Tasty/Discover/Internal/Driver.hs
@@ -106,9 +106,16 @@ findTests config = do
 -- | Extract the test names from discovered modules.
 extractTests :: FilePath -> String -> [Test]
 extractTests file = mkTestDeDuped . isKnownPrefix . parseTest
-  where mkTestDeDuped = map (mkTest file) . nub
+  where mkTestDeDuped :: [String] -> [Test]
+        mkTestDeDuped = map (mkTest file) . nub
+
+        isKnownPrefix :: [String] -> [String]
         isKnownPrefix = filter (\g -> any (checkPrefix g) generators)
+
+        checkPrefix :: String -> Generator -> Bool
         checkPrefix g = (`isPrefixOf` g) . generatorPrefix
+
+        parseTest :: String -> [String]
         parseTest     = map fst . concatMap lex . lines
 
 -- | Show the imports.
@@ -130,7 +137,7 @@ showTests config tests testNumVars = if treeDisplay config
   else zipWith const testNumVars tests
 
 newtype ModuleTree = ModuleTree (M.Map String (ModuleTree, [String]))
-  deriving (Eq, Show)
+  deriving stock (Eq, Show)
 
 showModuleTree :: ModuleTree -> [String]
 showModuleTree (ModuleTree mdls) = map showModule $ M.assocs mdls
diff --git a/src/Test/Tasty/Discover/Internal/Generator.hs b/src/Test/Tasty/Discover/Internal/Generator.hs
index a469a8d..31daa35 100644
--- a/src/Test/Tasty/Discover/Internal/Generator.hs
+++ b/src/Test/Tasty/Discover/Internal/Generator.hs
@@ -31,7 +31,7 @@ import System.FilePath (dropExtension, isPathSeparator)
 data Test = Test
   { testModule   :: String -- ^ Module name.
   , testFunction :: String -- ^ Function name.
-  } deriving (Eq, Show, Ord)
+  } deriving stock (Eq, Show, Ord)
 
 -- | 'Test' constructor.
 mkTest :: FilePath -> String -> Test
diff --git a/src/Test/Tasty/Discover/TastyInfo.hs b/src/Test/Tasty/Discover/TastyInfo.hs
index 9f68a09..9f3bedc 100644
--- a/src/Test/Tasty/Discover/TastyInfo.hs
+++ b/src/Test/Tasty/Discover/TastyInfo.hs
@@ -7,7 +7,7 @@ import Data.Monoid
 data TastyInfo = TastyInfo
   { name        :: Last String
   , description :: Last String
-  } deriving (Eq, Show)
+  } deriving stock (Eq, Show)
 
 instance Semigroup TastyInfo where
   a <> b = TastyInfo
diff --git a/tasty-discover.cabal b/tasty-discover.cabal
index 5a2077c..6c4cfcb 100644
--- a/tasty-discover.cabal
+++ b/tasty-discover.cabal
@@ -33,6 +33,11 @@ source-repository head
   type: git
   location: https://github.com/haskell-works/tasty-discover
 
+flag dev
+  description: Enable development mode
+  manual: True
+  default: False
+
 common base                       { build-depends: base                       >= 4.11       && < 5      }
 
 common bytestring                 { build-depends: bytestring                 >= 0.9      && < 1.0      }
@@ -51,14 +56,27 @@ common tasty-hunit                { build-depends: tasty-hunit                >=
 common tasty-quickcheck           { build-depends: tasty-quickcheck           >= 0.10     && < 0.11     }
 common tasty-smallcheck           { build-depends: tasty-smallcheck           >= 0.8      && < 1.0      }
 
+common project-config
+  default-extensions:   DerivingStrategies
+  if (impl(ghc >= 9.2.1))
+                        OverloadedRecordDot
+  ghc-options:          -Wall
+                        -Widentities
+                        -Wincomplete-uni-patterns
+                        -Wmissing-deriving-strategies
+                        -Wredundant-constraints
+                        -Wunused-packages
+  default-language:     GHC2021
+  if (flag(dev))
+    ghc-options:        -Werror
+
 common tasty-discover
   build-depends: tasty-discover
 
 library
-  import:               base
+  import:               base, project-config
                       , Glob
                       , containers
-                      , directory
                       , filepath
                       , tasty
   exposed-modules:      Test.Tasty.Discover
@@ -74,10 +92,7 @@ library
   default-language:     Haskell2010
 
 executable tasty-discover
-  import:               base
-                      , Glob
-                      , containers
-                      , directory
+  import:               base, project-config
                       , filepath
   main-is:              app/Main.hs
   autogen-modules:      Paths_tasty_discover
@@ -87,12 +102,9 @@ executable tasty-discover
   default-language:     Haskell2010
 
 test-suite tasty-discover-test
-  import:               base
-                      , Glob
+  import:               base, project-config
                       , bytestring
                       , containers
-                      , directory
-                      , filepath
                       , hedgehog
                       , hspec
                       , hspec-core