diff --git a/fog-vsphere.gemspec b/fog-vsphere.gemspec
index 8d14cd0..fae3818 100644
--- a/fog-vsphere.gemspec
+++ b/fog-vsphere.gemspec
@@ -27,12 +27,12 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'bundler'
   spec.add_development_dependency 'pry', '~> 0.10'
   spec.add_development_dependency 'rake', '>= 12.3.3'
-  spec.add_development_dependency 'minitest', '~> 5.8'
+  spec.add_development_dependency 'minitest', '~> 5.22'
   spec.add_development_dependency 'rubocop', '~> 1.39.0'
   spec.add_development_dependency 'rubocop-minitest'
   spec.add_development_dependency 'rubocop-performance'
   spec.add_development_dependency 'rubocop-rake'
-  spec.add_development_dependency 'mocha', '~> 1.8'
+  spec.add_development_dependency 'mocha', '~> 2.2'
   spec.add_development_dependency 'shindo', '~> 0.3'
   spec.add_development_dependency 'webmock', '~> 3.5'
   spec.add_development_dependency 'vcr', '~> 6.0'