diff --git a/lib/rb/thrift.gemspec b/lib/rb/thrift.gemspec
index 450de5b..fcc344f 100644
--- a/lib/rb/thrift.gemspec
+++ b/lib/rb/thrift.gemspec
@@ -27,11 +27,14 @@
 
   s.require_paths = %w[lib ext]
 
-  s.add_development_dependency 'rspec', ['>= 2.10.0', '< 2.14.0']
-  s.add_development_dependency "rack", "~> 1.5"
-  s.add_development_dependency "rack-test", "< 0.8.0" # 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'
+  s.add_development_dependency 'bundler',            '~> 1.11'
+  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',               '~> 2.0'
+  s.add_development_dependency 'rack-test',          '~> 0.8.3'
+  s.add_development_dependency 'rake',               '~> 12.3'
+  s.add_development_dependency 'rspec',              '~> 3.5'
+  s.add_development_dependency 'thin',               '~> 1.7'
 end