diff --git a/Gemfile b/Gemfile
index f960e78..efdad01 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,4 +2,4 @@ source 'https://rubygems.org'
 
 gemspec
 
-gem 'coveralls', require: false
+gem 'coveralls', '>= 0.8.22', require: false