diff --git a/CHANGELOG.md b/CHANGELOG.md
index ad819a71..53427af1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,6 @@
 # main [(unreleased)](https://github.com/whitesmith/rubycritic/compare/v4.9.1...main)
 
+* [CHANGE] Adds development dependency for gems removed from standard library in Ruby 3.5 -- ostruct, irb (by [@faisal][])
 * [CHANGE] Add .solargraph.yml config file to enable Solargraph LSP use in editors such as BBedit (by [@faisal])
 * [CHANGE] Drop support for Ruby 3.0.x (by [@faisal][])
 * [CHANGE] Bump minitest, mocha, rubocop dependencies (by [@faisal][])
diff --git a/rubycritic.gemspec b/rubycritic.gemspec
index ca118b9b..60388973 100644
--- a/rubycritic.gemspec
+++ b/rubycritic.gemspec
@@ -52,10 +52,12 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'cucumber', '~> 9.2.0', '!= 9.0.0'
   spec.add_development_dependency 'diff-lcs', '~> 1.3'
   spec.add_development_dependency 'fakefs', '~> 2.5.0'
+  spec.add_development_dependency 'irb'
   spec.add_development_dependency 'mdl', '~> 0.13.0', '>= 0.12.0'
   spec.add_development_dependency 'minitest', '~> 5.25.2', '>= 5.3.0'
   spec.add_development_dependency 'minitest-around', '~> 0.5.0', '>= 0.4.0'
   spec.add_development_dependency 'mocha', '~> 2.6.1'
+  spec.add_development_dependency 'ostruct'
   spec.add_development_dependency 'rake', '~> 13.2.0', '>= 11.0.0'
   spec.add_development_dependency 'rexml', '>= 3.2.0'
   spec.add_development_dependency 'rubocop', '~> 1.69.0', '>= 1.54.0'