diff --git a/src/ruby/grpc.gemspec b/src/ruby/grpc.gemspec
index 61cf18cf549167c0784a8095d1dfeaec847ca598..363abe9a46322bdbe27614cb25eb2f8c2bdf2794 100755
--- a/src/ruby/grpc.gemspec
+++ b/src/ruby/grpc.gemspec
@@ -39,6 +39,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'rake-compiler', '~> 0.9'
   s.add_development_dependency 'rspec', '~> 3.2'
   s.add_development_dependency 'rubocop', '~> 0.30.0'
+  s.add_development_dependency 'signet', '~>0.6.0'
 
   s.extensions = %w(ext/grpc/extconf.rb)
 end