diff --git a/Gemfile.lock b/Gemfile.lock
index 9b19a19..1653a6f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -140,6 +140,7 @@ DEPENDENCIES
   rubocop-performance (>= 1.0)
   rubocop-rake (>= 0.1)
   rubocop-rspec (>= 2.0)
+  rubocop-thread_safety (>= 0.1)
   service_actor!
   simplecov
   standard-rubocop-lts (>= 1.0.10)
diff --git a/service_actor.gemspec b/service_actor.gemspec
index 7916ea4..e37c576 100644
--- a/service_actor.gemspec
+++ b/service_actor.gemspec
@@ -69,6 +69,9 @@ Gem::Specification.new do |spec|
   # Add Rakefile linting
   spec.add_development_dependency "rubocop-rake", ">= 0.1"
 
+  # Thread-safety checks
+  spec.add_development_dependency "rubocop-thread_safety", ">= 0.1"
+
   # Formatter for GitHub’s code scanning
   spec.add_development_dependency "code-scanning-rubocop", ">= 0.6"