diff --git a/LICENSE b/LICENSE
--- a/LICENSE
+++ b/LICENSE
@@ -1,6 +1,6 @@
 union-find-array -- Union Find Data Structure
 
-Copyright (c) 2010-2013, Bertram Felgenhauer
+Copyright (c) 2010-2014, 2021, 2024, 2026, Bertram Felgenhauer
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/src/Control/Monad/Union.hs b/src/Control/Monad/Union.hs
--- a/src/Control/Monad/Union.hs
+++ b/src/Control/Monad/Union.hs
@@ -40,14 +40,13 @@
 }
 
 instance Monad (UnionM l) where
-    return x =  U (return x)
     f >>= b = U (runU f >>= \v -> runU (b v))
 
 instance Functor (UnionM l) where
     fmap = liftM
 
 instance Applicative (UnionM l) where
-    pure = return
+    pure x = U (return x)
     (<*>) = ap
 
 instance MonadFix (UnionM l) where
diff --git a/src/Data/Union/ST.hs b/src/Data/Union/ST.hs
--- a/src/Data/Union/ST.hs
+++ b/src/Data/Union/ST.hs
@@ -3,7 +3,7 @@
 --
 -- Authors: Bertram Felgenhauer
 
-{-# LANGUAGE RankNTypes, FlexibleContexts, CPP #-}
+{-# LANGUAGE RankNTypes, FlexibleContexts #-}
 -- |
 -- Low-level interface for managing a disjoint set data structure, based on
 -- 'Control.Monad.ST'. For a higher level convenience interface, look at
@@ -40,12 +40,6 @@
     size :: !Int,
     def :: l
 }
-
-#if __GLASGOW_HASKELL__ < 702
-instance Applicative (ST s) where
-    (<*>) = ap
-    pure = return
-#endif
 
 -- Use http://www.haskell.org/pipermail/libraries/2008-March/009465.html ?
 
diff --git a/union-find-array.cabal b/union-find-array.cabal
--- a/union-find-array.cabal
+++ b/union-find-array.cabal
@@ -1,9 +1,9 @@
 name:          union-find-array
-version:       0.1.0.4
+version:       0.1.0.5
 stability:     experimental
 author:        Bertram Felgenhauer
 maintainer:    Bertram Felgenhauer <int-e@gmx.de>
-copyright:     Copyright (c) 2010-2014, 2021, 2024, Bertram Felgenhauer
+copyright:     Copyright (c) 2010-2014, 2021, 2024, 2026, Bertram Felgenhauer
 license:       MIT
 license-file:  LICENSE
 category:      Algorithms, Data
@@ -19,7 +19,7 @@
 
 source-repository head
     type: git
-    location: git://github.com/haskell-rewriting/union-find-array
+    location: https://github.com/haskell-rewriting/union-find-array
 
 library
     hs-source-dirs:
@@ -33,7 +33,7 @@
     build-depends:
         array >= 0.3 && < 0.6,
         mtl >= 1.1 && < 2.4,
-        base >= 4 && < 5
+        base >= 4.8 && < 5
     default-language: Haskell2010
     other-extensions:
         GeneralizedNewtypeDeriving