diff --git a/lib/rb/thrift.gemspec b/lib/rb/thrift.gemspec
index 166a93f..c2533fd 100644
--- a/lib/rb/thrift.gemspec
+++ b/lib/rb/thrift.gemspec
@@ -29,7 +29,7 @@
 
   s.add_development_dependency 'rspec', ['>= 2.10.0', '< 2.14.0']
   s.add_development_dependency "rack", "~> 1.5"
-  s.add_development_dependency "rack-test", "~> 0.6"
+  s.add_development_dependency "rack-test", "< 0.8.0" # until we no longer build on trusty, then "~> 0.8.2"
   s.add_development_dependency "thin", "~> 1.5"
   s.add_development_dependency "bundler", "~> 1"
   s.add_development_dependency 'rake', '~> 10.5'