diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,14 @@
 Changelog for filelock package
 
+0.1.1.8
+-------
+
+_2025-08-27, Andreas Abel_
+
+* Remove obsolete `deriving Typeable`.
+
+Tested with GHC 8.0 - 9.14.1-alpha1.
+
 0.1.1.7
 -------
 
diff --git a/System/FileLock.hs b/System/FileLock.hs
--- a/System/FileLock.hs
+++ b/System/FileLock.hs
@@ -1,4 +1,3 @@
-{-# LANGUAGE DeriveDataTypeable #-}
 {-# LANGUAGE CPP #-}
 
 -- | This module provides a portable interface to file locks as a mechanism for
@@ -38,7 +37,6 @@
 import qualified Control.Exception as E
 import Control.Monad
 import Data.IORef
-import Data.Typeable
 import Prelude
 
 #ifdef USE_FLOCK
@@ -53,7 +51,6 @@
 data FileLock = Lock
   {-# UNPACk #-} !I.Lock
   {-# UNPACk #-} !(IORef Bool) -- alive?
-  deriving (Typeable)
 
 instance Eq FileLock where
   Lock _ x == Lock _ y = x == y
@@ -65,7 +62,7 @@
 data SharedExclusive
   = Shared -- ^ Other process can hold a shared lock at the same time.
   | Exclusive -- ^ No other process can hold a lock, shared or exclusive.
-  deriving (Show, Eq, Typeable)
+  deriving (Show, Eq)
 
 -- | Take a lock. This function blocks until the lock is available.
 lockFile :: FilePath -> SharedExclusive -> IO FileLock
@@ -86,6 +83,6 @@
 withFileLock :: FilePath -> SharedExclusive -> (FileLock -> IO a) -> IO a
 withFileLock path mode = E.bracket (lockFile path mode) unlockFile
 
--- | Perform sme action with a lock held. Non-blocking.
+-- | Perform some action with a lock held. Non-blocking.
 withTryFileLock :: FilePath -> SharedExclusive -> (FileLock -> IO a) -> IO (Maybe a)
 withTryFileLock path mode f = E.bracket (tryLockFile path mode) (traverse unlockFile) (traverse f)
diff --git a/filelock.cabal b/filelock.cabal
--- a/filelock.cabal
+++ b/filelock.cabal
@@ -1,6 +1,6 @@
-cabal-version:       >=1.10
+cabal-version:       1.18
 name:                filelock
-version:             0.1.1.7
+version:             0.1.1.8
 synopsis:            Portable interface to file locking (flock / LockFileEx)
 description:         This package provides an interface to Windows and Unix
                      file locking functionalities.
@@ -12,13 +12,18 @@
 category:            System
 build-type:          Simple
 
-extra-source-files:
+extra-doc-files:
   CHANGELOG.md
+extra-source-files:
   tests/lock.log.expected
 
 tested-with:
-  GHC == 9.6.2
-  GHC == 9.4.5
+  GHC == 9.14.1
+  GHC == 9.12.2
+  GHC == 9.10.2
+  GHC == 9.8.4
+  GHC == 9.6.7
+  GHC == 9.4.8
   GHC == 9.2.8
   GHC == 9.0.2
   GHC == 8.10.7
@@ -58,7 +63,7 @@
   type:               exitcode-stdio-1.0
   hs-source-dirs:     tests
   main-is:            interrupt.hs
-  build-depends:      filelock, process >= 1.2.1.0, base
+  build-depends:      filelock, base
   ghc-options:        -threaded
   default-language:   Haskell2010
   if os(windows)