diff --git a/.github/workflows/test-and-deploy.yml b/.github/workflows/test-and-deploy.yml
index d414ff07..db7400e0 100644
--- a/.github/workflows/test-and-deploy.yml
+++ b/.github/workflows/test-and-deploy.yml
@@ -17,7 +17,7 @@ jobs:
     timeout-minutes: 20
     strategy:
       matrix:
-        ruby: [ '2.4', '2.5', '2.6', '2.7', '3.0', '3.1', 'jruby-9.2' ]
+        ruby: [ '2.4', '2.5', '2.6', '2.7', '3.0', '3.1', '3.2', '3.3', '3.4', 'jruby-9.2' ]
     env:
       version: ${{ format('ruby:{0}', matrix.ruby) }}
       DOCKER_LOGIN: ${{ secrets.DOCKER_USERNAME && secrets.DOCKER_AUTH_TOKEN }}
diff --git a/sendgrid-ruby.gemspec b/sendgrid-ruby.gemspec
index 3856eb3b..8c8f51c9 100644
--- a/sendgrid-ruby.gemspec
+++ b/sendgrid-ruby.gemspec
@@ -25,6 +25,6 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'rack'
   spec.add_development_dependency 'rake', '~> 13.0'
   spec.add_development_dependency 'rspec'
-  spec.add_development_dependency 'simplecov', '~> 0.18.5'
+  spec.add_development_dependency 'simplecov', '~> 0.22.0'
   spec.add_development_dependency 'sinatra', '>= 1.4.7', '< 3'
 end