diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 8e79294..7572062 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -7,7 +7,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: ['2.5', '2.6', '2.7', '3.0', '3.1', '3.2', '3.3', '3.4']
+        ruby: ['2.5', '2.6', '2.7', '3.0', '3.1', '3.2', '3.3', '3.4', '4.0']
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v4
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2d7017a..0ddc4b1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,7 +6,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Add
+- Loosen Bundler depndency constraint to allow major version 4 ([#99]).
+- Add Ruby 4.0 to the CI test matrix ([#99]).
+
 [Unreleased]: https://github.com/envato/unwrappr/compare/v0.8.2...HEAD
+[#99]: https://github.com/envato/unwrappr/pull/99
 
 ## [0.8.2] 2024-12-28
 
diff --git a/unwrappr.gemspec b/unwrappr.gemspec
index 6b9080e..e3418c4 100644
--- a/unwrappr.gemspec
+++ b/unwrappr.gemspec
@@ -38,7 +38,7 @@ Gem::Specification.new do |spec| # rubocop:disable Metrics/BlockLength
   spec.require_paths = ['lib']
 
   spec.add_dependency 'base64'
-  spec.add_dependency 'bundler', '< 3'
+  spec.add_dependency 'bundler', '> 2', '< 5'
   spec.add_dependency 'bundler-audit', '>= 0.6.0'
   spec.add_dependency 'clamp', '~> 1'
   spec.add_dependency 'faraday', '~> 1'