diff --git a/basic_temperature.gemspec b/basic_temperature.gemspec
index eb0239d..4f2657b 100644
--- a/basic_temperature.gemspec
+++ b/basic_temperature.gemspec
@@ -34,7 +34,7 @@ Gem::Specification.new do |spec|
 
   spec.add_development_dependency 'bundler-audit'
   spec.add_development_dependency 'byebug', '~> 10.0'
-  spec.add_development_dependency 'coveralls'
+  spec.add_development_dependency 'coveralls', '~> 0.8'
   spec.add_development_dependency 'rake', '~> 12.0'
   spec.add_development_dependency 'rerun'
   spec.add_development_dependency 'reverse_coverage'