diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,11 @@
+0.1.1.0
+-------
+
+_Andreas Abel, 2026-01-06_
+
+* Add `deriving Generic` (Olaf Klinke, [PR #5](https://github.com/andreasabel/peano.hs/pull/5)).
+* Tested with GHC 8.0 - 9.14.1.
+
 0.1.0.3
 -------
 
diff --git a/Data/Peano.hs b/Data/Peano.hs
--- a/Data/Peano.hs
+++ b/Data/Peano.hs
@@ -1,15 +1,16 @@
 -- | See 'Peano'.
-
+{-# LANGUAGE DeriveGeneric #-}
 module Data.Peano ( Peano (Zero, Succ), infinity ) where
 
 import Data.Data       ( Data )
 import Data.Ix         ( Ix( index, inRange, range, rangeSize ) )
+import GHC.Generics    ( Generic )
 
 -- | The natural numbers in (lazy) unary notation.
 data Peano
   = Zero
   | Succ Peano
-  deriving (Eq, Ord, Data, Read, Show)
+  deriving (Eq, Ord, Data, Read, Show, Generic)
 
 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:             0.1.0.3
+version:             0.1.1.0
 synopsis:            Peano numbers
 description:         Lazy unary natural numbers.
 license:             BSD3
@@ -13,7 +13,7 @@
 tested-with:
   GHC == 9.14.1
   GHC == 9.12.2
-  GHC == 9.10.2
+  GHC == 9.10.3
   GHC == 9.8.4
   GHC == 9.6.7
   GHC == 9.4.8