diff --git a/zuora.gemspec b/zuora.gemspec
index 149fae0..11e90c3 100644
--- a/zuora.gemspec
+++ b/zuora.gemspec
@@ -30,7 +30,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'rake', '~> 13.0'
   s.add_development_dependency 'redcarpet', '~> 2.1.0'
   s.add_development_dependency 'rspec', '~> 3.0'
-  s.add_development_dependency 'simplecov', '~> 0.6.4'
+  s.add_development_dependency 'simplecov', '~> 0.22.0'
   s.add_development_dependency 'sqlite3', '~> 1.3.0'
   s.add_development_dependency 'test-unit'
   s.add_development_dependency 'yard', '~> 0.7.5'