diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index e03470f..2555158 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -15,6 +15,10 @@ jobs:
           - { ruby: "3.2", rails: "6.1.7", grape-swagger: "2.1.1" }
           - { ruby: "3.2", rails: "7.2.1", grape-swagger: "1.6.1" }
           - { ruby: "3.2", rails: "7.2.1", grape-swagger: "2.1.1" }
+          - { ruby: "3.3", rails: "6.1.7", grape-swagger: "1.6.1" }
+          - { ruby: "3.3", rails: "6.1.7", grape-swagger: "2.1.1" }
+          - { ruby: "3.3", rails: "7.2.1", grape-swagger: "1.6.1" }
+          - { ruby: "3.3", rails: "7.2.1", grape-swagger: "2.1.1" }
           - { ruby: "jruby-9.4.6", rails: "6.1.7", grape-swagger: "1.6.1" }
           - { ruby: "jruby-9.4.6", rails: "6.1.7", grape-swagger: "2.1.1" }
           - { ruby: "jruby-9.4.6", rails: "7.2.1", grape-swagger: "1.6.1" }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index befd189..a43a2b1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,7 @@
 * [#124](https://github.com/ruby-grape/grape-swagger-rails/pull/124): Rails 7 compatibility - [@padde](https://github.com/padde).
 * [#125](https://github.com/ruby-grape/grape-swagger-rails/pull/125): Add rails versions to CI matrix - [@padde](https://github.com/padde).
 * [#127](https://github.com/ruby-grape/grape-swagger-rails/pull/127): Bump Firefox and geckodriver - [@padde](https://github.com/padde).
+* [#126](https://github.com/ruby-grape/grape-swagger-rails/pull/126): Ruby 3.5 compatibility - [@padde](https://github.com/padde).
 * Your contribution here.
 
 ### 0.5.0 (2024/04/06)
diff --git a/grape-swagger-rails.gemspec b/grape-swagger-rails.gemspec
index b3972f5..2bc0d77 100644
--- a/grape-swagger-rails.gemspec
+++ b/grape-swagger-rails.gemspec
@@ -15,6 +15,7 @@ Gem::Specification.new do |spec|
   spec.license       = 'MIT'
   spec.files         = `git ls-files`.split($INPUT_RECORD_SEPARATOR)
   spec.require_paths = %w[lib]
+  spec.add_dependency 'ostruct'
   spec.add_dependency 'railties', '>= 6.0.6.1'
   spec.metadata = {
     'bug_tracker_uri' => 'https://github.com/ruby-grape/grape-swagger-rails/issues',