diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+# 0.0.1.2
+
+- Updated version bounds for dependencies.
+
 # 0.0.1.1
 
 - Updated version bounds for dependencies.
diff --git a/LICENSE b/LICENSE
--- a/LICENSE
+++ b/LICENSE
@@ -186,7 +186,7 @@
       same "printed page" as the copyright notice for easier
       identification within third-party archives.
 
-   Copyright © 2022–2023 Jonathan Knowles
+   Copyright © 2022–2024 Jonathan Knowles
 
    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
diff --git a/monoidmap.cabal b/monoidmap.cabal
--- a/monoidmap.cabal
+++ b/monoidmap.cabal
@@ -1,12 +1,12 @@
 cabal-version:  3.0
 name:           monoidmap
-version:        0.0.1.1
+version:        0.0.1.2
 bug-reports:    https://github.com/jonathanknowles/monoidmap/issues
 license:        Apache-2.0
 license-file:   LICENSE
 author:         Jonathan Knowles
 maintainer:     mail@jonathanknowles.net
-copyright:      2022–2023 Jonathan Knowles
+copyright:      2022–2024 Jonathan Knowles
 category:       Data Structures
 synopsis:       Monoidal map type
 description:
@@ -19,7 +19,7 @@
 common dependency-base
     build-depends:base                          >= 4.14.3.0   && < 4.20
 common dependency-containers
-    build-depends:containers                    >= 0.6.5.1    && < 0.7
+    build-depends:containers                    >= 0.6.5.1    && < 0.8
 common dependency-deepseq
     build-depends:deepseq                       >= 1.4.4.0    && < 1.6
 common dependency-groups
diff --git a/src/examples/Examples/MultiMap.hs b/src/examples/Examples/MultiMap.hs
--- a/src/examples/Examples/MultiMap.hs
+++ b/src/examples/Examples/MultiMap.hs
@@ -1,6 +1,6 @@
 {-# OPTIONS_GHC -fno-warn-unused-imports #-}
 -- |
--- Copyright: © 2022–2023 Jonathan Knowles
+-- Copyright: © 2022–2024 Jonathan Knowles
 -- License: Apache-2.0
 --
 -- Provides the 'MultiMap' class, which models a total relation from unique
diff --git a/src/examples/Examples/MultiMap/Class.hs b/src/examples/Examples/MultiMap/Class.hs
--- a/src/examples/Examples/MultiMap/Class.hs
+++ b/src/examples/Examples/MultiMap/Class.hs
@@ -1,5 +1,5 @@
 -- |
--- Copyright: © 2022–2023 Jonathan Knowles
+-- Copyright: © 2022–2024 Jonathan Knowles
 -- License: Apache-2.0
 --
 -- Provides the 'MultiMap' class, which models a total relation from unique
diff --git a/src/examples/Examples/MultiMap/Instances/MultiMap1.hs b/src/examples/Examples/MultiMap/Instances/MultiMap1.hs
--- a/src/examples/Examples/MultiMap/Instances/MultiMap1.hs
+++ b/src/examples/Examples/MultiMap/Instances/MultiMap1.hs
@@ -1,5 +1,5 @@
 -- |
--- Copyright: © 2022–2023 Jonathan Knowles
+-- Copyright: © 2022–2024 Jonathan Knowles
 -- License: Apache-2.0
 --
 -- An __unlawful__ implementation of 'MultiMap', implemented in terms of 'Map'
diff --git a/src/examples/Examples/MultiMap/Instances/MultiMap2.hs b/src/examples/Examples/MultiMap/Instances/MultiMap2.hs
--- a/src/examples/Examples/MultiMap/Instances/MultiMap2.hs
+++ b/src/examples/Examples/MultiMap/Instances/MultiMap2.hs
@@ -1,5 +1,5 @@
 -- |
--- Copyright: © 2022–2023 Jonathan Knowles
+-- Copyright: © 2022–2024 Jonathan Knowles
 -- License: Apache-2.0
 --
 -- A __lawful__ implementation of 'MultiMap', implemented in terms of 'Map' and
diff --git a/src/examples/Examples/MultiMap/Instances/MultiMap3.hs b/src/examples/Examples/MultiMap/Instances/MultiMap3.hs
--- a/src/examples/Examples/MultiMap/Instances/MultiMap3.hs
+++ b/src/examples/Examples/MultiMap/Instances/MultiMap3.hs
@@ -1,5 +1,5 @@
 -- |
--- Copyright: © 2022–2023 Jonathan Knowles
+-- Copyright: © 2022–2024 Jonathan Knowles
 -- License: Apache-2.0
 --
 -- A __lawful__ implementation of 'MultiMap', implemented in terms of 'Map' and
diff --git a/src/examples/Examples/MultiMap/Instances/MultiMap4.hs b/src/examples/Examples/MultiMap/Instances/MultiMap4.hs
--- a/src/examples/Examples/MultiMap/Instances/MultiMap4.hs
+++ b/src/examples/Examples/MultiMap/Instances/MultiMap4.hs
@@ -1,5 +1,5 @@
 -- |
--- Copyright: © 2022–2023 Jonathan Knowles
+-- Copyright: © 2022–2024 Jonathan Knowles
 -- License: Apache-2.0
 --
 -- A __lawful__ implementation of 'MultiMap', implemented in terms of
diff --git a/src/examples/Examples/MultiSet.hs b/src/examples/Examples/MultiSet.hs
--- a/src/examples/Examples/MultiSet.hs
+++ b/src/examples/Examples/MultiSet.hs
@@ -1,5 +1,5 @@
 -- |
--- Copyright: © 2022–2023 Jonathan Knowles
+-- Copyright: © 2022–2024 Jonathan Knowles
 -- License: Apache-2.0
 --
 -- A multiset type, implemented in terms of 'MonoidMap'.
diff --git a/src/examples/Examples/NestedMonoidMap.hs b/src/examples/Examples/NestedMonoidMap.hs
--- a/src/examples/Examples/NestedMonoidMap.hs
+++ b/src/examples/Examples/NestedMonoidMap.hs
@@ -1,7 +1,7 @@
 {-# LANGUAGE TypeSynonymInstances #-}
 
 -- |
--- Copyright: © 2022–2023 Jonathan Knowles
+-- Copyright: © 2022–2024 Jonathan Knowles
 -- License: Apache-2.0
 --
 -- A nested map with compound keys, implemented in terms of 'MonoidMap'.
diff --git a/src/examples/Examples/RecoveredMap.hs b/src/examples/Examples/RecoveredMap.hs
--- a/src/examples/Examples/RecoveredMap.hs
+++ b/src/examples/Examples/RecoveredMap.hs
@@ -2,7 +2,7 @@
 {-# LANGUAGE GeneralizedNewtypeDeriving #-}
 
 -- |
--- Copyright: © 2022–2023 Jonathan Knowles
+-- Copyright: © 2022–2024 Jonathan Knowles
 -- License: Apache-2.0
 --
 -- An ordinary left-biased map similar to 'Map', implemented in terms of
diff --git a/src/internal/Data/MonoidMap/Internal.hs b/src/internal/Data/MonoidMap/Internal.hs
--- a/src/internal/Data/MonoidMap/Internal.hs
+++ b/src/internal/Data/MonoidMap/Internal.hs
@@ -5,7 +5,7 @@
 {- HLINT ignore "Redundant bracket" -}
 
 -- |
--- Copyright: © 2022–2023 Jonathan Knowles
+-- Copyright: © 2022–2024 Jonathan Knowles
 -- License: Apache-2.0
 --
 -- Provides /internal/ operations for the 'MonoidMap' type.
diff --git a/src/internal/Data/MonoidMap/Unsafe.hs b/src/internal/Data/MonoidMap/Unsafe.hs
--- a/src/internal/Data/MonoidMap/Unsafe.hs
+++ b/src/internal/Data/MonoidMap/Unsafe.hs
@@ -1,7 +1,7 @@
 {-# OPTIONS_GHC -fno-warn-unused-imports #-}
 
 -- |
--- Copyright: © 2022–2023 Jonathan Knowles
+-- Copyright: © 2022–2024 Jonathan Knowles
 -- License: Apache-2.0
 --
 -- Provides /unsafe/ operations for the 'MonoidMap' type.
diff --git a/src/public/Data/MonoidMap.hs b/src/public/Data/MonoidMap.hs
--- a/src/public/Data/MonoidMap.hs
+++ b/src/public/Data/MonoidMap.hs
@@ -1,7 +1,7 @@
 {-# OPTIONS_GHC -fno-warn-unused-imports #-}
 
 -- |
--- Copyright: © 2022–2023 Jonathan Knowles
+-- Copyright: © 2022–2024 Jonathan Knowles
 -- License: Apache-2.0
 --
 module Data.MonoidMap
diff --git a/src/test/Data/MonoidMap/AccessSpec.hs b/src/test/Data/MonoidMap/AccessSpec.hs
--- a/src/test/Data/MonoidMap/AccessSpec.hs
+++ b/src/test/Data/MonoidMap/AccessSpec.hs
@@ -3,7 +3,7 @@
 {- HLINT ignore "Use null" -}
 
 -- |
--- Copyright: © 2022–2023 Jonathan Knowles
+-- Copyright: © 2022–2024 Jonathan Knowles
 -- License: Apache-2.0
 --
 module Data.MonoidMap.AccessSpec
diff --git a/src/test/Data/MonoidMap/ClassSpec.hs b/src/test/Data/MonoidMap/ClassSpec.hs
--- a/src/test/Data/MonoidMap/ClassSpec.hs
+++ b/src/test/Data/MonoidMap/ClassSpec.hs
@@ -1,7 +1,7 @@
 {-# OPTIONS_GHC -fno-warn-orphans #-}
 
 -- |
--- Copyright: © 2022–2023 Jonathan Knowles
+-- Copyright: © 2022–2024 Jonathan Knowles
 -- License: Apache-2.0
 --
 module Data.MonoidMap.ClassSpec
diff --git a/src/test/Data/MonoidMap/ComparisonSpec.hs b/src/test/Data/MonoidMap/ComparisonSpec.hs
--- a/src/test/Data/MonoidMap/ComparisonSpec.hs
+++ b/src/test/Data/MonoidMap/ComparisonSpec.hs
@@ -3,7 +3,7 @@
 {- HLINT ignore "Use null" -}
 
 -- |
--- Copyright: © 2022–2023 Jonathan Knowles
+-- Copyright: © 2022–2024 Jonathan Knowles
 -- License: Apache-2.0
 --
 module Data.MonoidMap.ComparisonSpec
diff --git a/src/test/Data/MonoidMap/ConversionSpec.hs b/src/test/Data/MonoidMap/ConversionSpec.hs
--- a/src/test/Data/MonoidMap/ConversionSpec.hs
+++ b/src/test/Data/MonoidMap/ConversionSpec.hs
@@ -3,7 +3,7 @@
 {- HLINT ignore "Use null" -}
 
 -- |
--- Copyright: © 2022–2023 Jonathan Knowles
+-- Copyright: © 2022–2024 Jonathan Knowles
 -- License: Apache-2.0
 --
 module Data.MonoidMap.ConversionSpec
diff --git a/src/test/Data/MonoidMap/DistributivitySpec.hs b/src/test/Data/MonoidMap/DistributivitySpec.hs
--- a/src/test/Data/MonoidMap/DistributivitySpec.hs
+++ b/src/test/Data/MonoidMap/DistributivitySpec.hs
@@ -4,7 +4,7 @@
 {- HLINT ignore "Use null" -}
 
 -- |
--- Copyright: © 2022–2023 Jonathan Knowles
+-- Copyright: © 2022–2024 Jonathan Knowles
 -- License: Apache-2.0
 --
 module Data.MonoidMap.DistributivitySpec
diff --git a/src/test/Data/MonoidMap/ExampleSpec.hs b/src/test/Data/MonoidMap/ExampleSpec.hs
--- a/src/test/Data/MonoidMap/ExampleSpec.hs
+++ b/src/test/Data/MonoidMap/ExampleSpec.hs
@@ -5,7 +5,7 @@
 {- HLINT ignore "Use null" -}
 
 -- |
--- Copyright: © 2022–2023 Jonathan Knowles
+-- Copyright: © 2022–2024 Jonathan Knowles
 -- License: Apache-2.0
 --
 module Data.MonoidMap.ExampleSpec
diff --git a/src/test/Data/MonoidMap/FilterSpec.hs b/src/test/Data/MonoidMap/FilterSpec.hs
--- a/src/test/Data/MonoidMap/FilterSpec.hs
+++ b/src/test/Data/MonoidMap/FilterSpec.hs
@@ -3,7 +3,7 @@
 {- HLINT ignore "Use null" -}
 
 -- |
--- Copyright: © 2022–2023 Jonathan Knowles
+-- Copyright: © 2022–2024 Jonathan Knowles
 -- License: Apache-2.0
 --
 module Data.MonoidMap.FilterSpec
diff --git a/src/test/Data/MonoidMap/IntersectionSpec.hs b/src/test/Data/MonoidMap/IntersectionSpec.hs
--- a/src/test/Data/MonoidMap/IntersectionSpec.hs
+++ b/src/test/Data/MonoidMap/IntersectionSpec.hs
@@ -3,7 +3,7 @@
 {- HLINT ignore "Use null" -}
 
 -- |
--- Copyright: © 2022–2023 Jonathan Knowles
+-- Copyright: © 2022–2024 Jonathan Knowles
 -- License: Apache-2.0
 --
 module Data.MonoidMap.IntersectionSpec
diff --git a/src/test/Data/MonoidMap/MapSpec.hs b/src/test/Data/MonoidMap/MapSpec.hs
--- a/src/test/Data/MonoidMap/MapSpec.hs
+++ b/src/test/Data/MonoidMap/MapSpec.hs
@@ -3,7 +3,7 @@
 {- HLINT ignore "Use null" -}
 
 -- |
--- Copyright: © 2022–2023 Jonathan Knowles
+-- Copyright: © 2022–2024 Jonathan Knowles
 -- License: Apache-2.0
 --
 module Data.MonoidMap.MapSpec
diff --git a/src/test/Data/MonoidMap/MembershipSpec.hs b/src/test/Data/MonoidMap/MembershipSpec.hs
--- a/src/test/Data/MonoidMap/MembershipSpec.hs
+++ b/src/test/Data/MonoidMap/MembershipSpec.hs
@@ -3,7 +3,7 @@
 {- HLINT ignore "Use null" -}
 
 -- |
--- Copyright: © 2022–2023 Jonathan Knowles
+-- Copyright: © 2022–2024 Jonathan Knowles
 -- License: Apache-2.0
 --
 module Data.MonoidMap.MembershipSpec
diff --git a/src/test/Data/MonoidMap/PartitionSpec.hs b/src/test/Data/MonoidMap/PartitionSpec.hs
--- a/src/test/Data/MonoidMap/PartitionSpec.hs
+++ b/src/test/Data/MonoidMap/PartitionSpec.hs
@@ -3,7 +3,7 @@
 {- HLINT ignore "Use null" -}
 
 -- |
--- Copyright: © 2022–2023 Jonathan Knowles
+-- Copyright: © 2022–2024 Jonathan Knowles
 -- License: Apache-2.0
 --
 module Data.MonoidMap.PartitionSpec
diff --git a/src/test/Data/MonoidMap/PrefixSpec.hs b/src/test/Data/MonoidMap/PrefixSpec.hs
--- a/src/test/Data/MonoidMap/PrefixSpec.hs
+++ b/src/test/Data/MonoidMap/PrefixSpec.hs
@@ -3,7 +3,7 @@
 {- HLINT ignore "Use null" -}
 
 -- |
--- Copyright: © 2022–2023 Jonathan Knowles
+-- Copyright: © 2022–2024 Jonathan Knowles
 -- License: Apache-2.0
 --
 module Data.MonoidMap.PrefixSpec
diff --git a/src/test/Data/MonoidMap/SingletonSpec.hs b/src/test/Data/MonoidMap/SingletonSpec.hs
--- a/src/test/Data/MonoidMap/SingletonSpec.hs
+++ b/src/test/Data/MonoidMap/SingletonSpec.hs
@@ -3,7 +3,7 @@
 {- HLINT ignore "Use null" -}
 
 -- |
--- Copyright: © 2022–2023 Jonathan Knowles
+-- Copyright: © 2022–2024 Jonathan Knowles
 -- License: Apache-2.0
 --
 module Data.MonoidMap.SingletonSpec
diff --git a/src/test/Data/MonoidMap/SliceSpec.hs b/src/test/Data/MonoidMap/SliceSpec.hs
--- a/src/test/Data/MonoidMap/SliceSpec.hs
+++ b/src/test/Data/MonoidMap/SliceSpec.hs
@@ -3,7 +3,7 @@
 {- HLINT ignore "Use null" -}
 
 -- |
--- Copyright: © 2022–2023 Jonathan Knowles
+-- Copyright: © 2022–2024 Jonathan Knowles
 -- License: Apache-2.0
 --
 module Data.MonoidMap.SliceSpec
diff --git a/src/test/Data/MonoidMap/SuffixSpec.hs b/src/test/Data/MonoidMap/SuffixSpec.hs
--- a/src/test/Data/MonoidMap/SuffixSpec.hs
+++ b/src/test/Data/MonoidMap/SuffixSpec.hs
@@ -3,7 +3,7 @@
 {- HLINT ignore "Use null" -}
 
 -- |
--- Copyright: © 2022–2023 Jonathan Knowles
+-- Copyright: © 2022–2024 Jonathan Knowles
 -- License: Apache-2.0
 --
 module Data.MonoidMap.SuffixSpec
diff --git a/src/test/Data/MonoidMap/UnionSpec.hs b/src/test/Data/MonoidMap/UnionSpec.hs
--- a/src/test/Data/MonoidMap/UnionSpec.hs
+++ b/src/test/Data/MonoidMap/UnionSpec.hs
@@ -3,7 +3,7 @@
 {- HLINT ignore "Use null" -}
 
 -- |
--- Copyright: © 2022–2023 Jonathan Knowles
+-- Copyright: © 2022–2024 Jonathan Knowles
 -- License: Apache-2.0
 --
 module Data.MonoidMap.UnionSpec
diff --git a/src/test/Data/MonoidMap/ValiditySpec.hs b/src/test/Data/MonoidMap/ValiditySpec.hs
--- a/src/test/Data/MonoidMap/ValiditySpec.hs
+++ b/src/test/Data/MonoidMap/ValiditySpec.hs
@@ -2,7 +2,7 @@
 {-# LANGUAGE RankNTypes #-}
 
 -- |
--- Copyright: © 2022–2023 Jonathan Knowles
+-- Copyright: © 2022–2024 Jonathan Knowles
 -- License: Apache-2.0
 --
 module Data.MonoidMap.ValiditySpec
diff --git a/src/test/Examples/MultiMapSpec.hs b/src/test/Examples/MultiMapSpec.hs
--- a/src/test/Examples/MultiMapSpec.hs
+++ b/src/test/Examples/MultiMapSpec.hs
@@ -5,7 +5,7 @@
 {- HLINT ignore "Use null" -}
 
 -- |
--- Copyright: © 2022–2023 Jonathan Knowles
+-- Copyright: © 2022–2024 Jonathan Knowles
 -- License: Apache-2.0
 --
 module Examples.MultiMapSpec
diff --git a/src/test/Examples/RecoveredMapSpec.hs b/src/test/Examples/RecoveredMapSpec.hs
--- a/src/test/Examples/RecoveredMapSpec.hs
+++ b/src/test/Examples/RecoveredMapSpec.hs
@@ -5,7 +5,7 @@
 {-# HLINT ignore "Use null" #-}
 
 -- |
--- Copyright: © 2022–2023 Jonathan Knowles
+-- Copyright: © 2022–2024 Jonathan Knowles
 -- License: Apache-2.0
 --
 module Examples.RecoveredMapSpec
diff --git a/src/test/Test/Common.hs b/src/test/Test/Common.hs
--- a/src/test/Test/Common.hs
+++ b/src/test/Test/Common.hs
@@ -5,7 +5,7 @@
 {- HLINT ignore "Use null" -}
 
 -- |
--- Copyright: © 2022–2023 Jonathan Knowles
+-- Copyright: © 2022–2024 Jonathan Knowles
 -- License: Apache-2.0
 --
 module Test.Common
diff --git a/src/test/Test/Hspec/Unit.hs b/src/test/Test/Hspec/Unit.hs
--- a/src/test/Test/Hspec/Unit.hs
+++ b/src/test/Test/Hspec/Unit.hs
@@ -1,7 +1,7 @@
 {-# LANGUAGE FunctionalDependencies #-}
 
 -- |
--- Copyright: © 2022–2023 Jonathan Knowles
+-- Copyright: © 2022–2024 Jonathan Knowles
 -- License: Apache-2.0
 --
 module Test.Hspec.Unit where
diff --git a/src/test/Test/QuickCheck/Classes/Hspec.hs b/src/test/Test/QuickCheck/Classes/Hspec.hs
--- a/src/test/Test/QuickCheck/Classes/Hspec.hs
+++ b/src/test/Test/QuickCheck/Classes/Hspec.hs
@@ -1,7 +1,7 @@
 {-# LANGUAGE PolyKinds #-}
 
 -- |
--- Copyright: © 2022–2023 Jonathan Knowles
+-- Copyright: © 2022–2024 Jonathan Knowles
 -- License: Apache-2.0
 --
 -- Provides testing functions to check that type class instances obey laws.