diff --git a/openfact.gemspec b/openfact.gemspec
index 0bec1f2c9..9947e75d5 100644
--- a/openfact.gemspec
+++ b/openfact.gemspec
@@ -42,7 +42,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'rubocop-performance', '~> 1.5'
   spec.add_development_dependency 'rubocop-rake', '< 1'
   spec.add_development_dependency 'rubocop-rspec', '>= 2.10', '< 4'
-  spec.add_development_dependency 'simplecov', '~> 0.17'
+  spec.add_development_dependency 'simplecov', '~> 1.0'
   spec.add_development_dependency 'sys-filesystem', '~> 1.4'
   spec.add_development_dependency 'webmock', '~> 3.12'
   spec.add_development_dependency 'yard', '~> 0.9'