diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,11 @@
+0.1.0.3
+-------
+
+_Andreas Abel, 2025-09-02_
+
+* Remove obsolete `deriving Typeable`.
+* Tested with GHC 8.0 - 9.14.1 alpha1.
+
 0.1.0.2
 -------
 
diff --git a/Data/Peano.hs b/Data/Peano.hs
--- a/Data/Peano.hs
+++ b/Data/Peano.hs
@@ -2,14 +2,14 @@
 
 module Data.Peano ( Peano (Zero, Succ), infinity ) where
 
-import Data.Data       ( Data, Typeable )
+import Data.Data       ( Data )
 import Data.Ix         ( Ix( index, inRange, range, rangeSize ) )
 
 -- | The natural numbers in (lazy) unary notation.
 data Peano
   = Zero
   | Succ Peano
-  deriving (Eq, Ord, Typeable, Data, Read, Show)
+  deriving (Eq, Ord, Data, Read, Show)
 
 instance Enum Peano where
     succ = Succ
diff --git a/peano.cabal b/peano.cabal
--- a/peano.cabal
+++ b/peano.cabal
@@ -1,6 +1,6 @@
 cabal-version:       1.18
 name:                peano
-version:             0.1.0.2
+version:             0.1.0.3
 synopsis:            Peano numbers
 description:         Lazy unary natural numbers.
 license:             BSD3
@@ -11,9 +11,12 @@
 build-type:          Simple
 
 tested-with:
-  GHC == 9.8.1
-  GHC == 9.6.3
-  GHC == 9.4.7
+  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