Fix Dependabot alert #140
diff --git a/lib/rb/thrift.gemspec b/lib/rb/thrift.gemspec
index 3d25bcd..744d078 100644
--- a/lib/rb/thrift.gemspec
+++ b/lib/rb/thrift.gemspec
@@ -30,7 +30,7 @@
s.add_development_dependency 'pry', '~> 0.11.3'
s.add_development_dependency 'pry-byebug', '~> 3.6'
s.add_development_dependency 'pry-stack_explorer', '~> 0.4.9.2'
- s.add_development_dependency 'rack', '= 2.2.6.4'
+ s.add_development_dependency 'rack', '>= 2.2.20'
s.add_development_dependency 'rack-test', '~> 0.8.3'
s.add_development_dependency 'rake', '~> 12.3'
s.add_development_dependency 'rspec', '~> 3.7'