diff --git a/templates/grpc.gemspec.template b/templates/grpc.gemspec.template
index d80248c623a0dd7cb8d8013e3c0ba63f4b0f4e65..62d61b75c1df74fbbdfa7ad58f2c44c6d77b1c9e 100644
--- a/templates/grpc.gemspec.template
+++ b/templates/grpc.gemspec.template
@@ -31,7 +31,6 @@
 
     s.add_dependency 'google-protobuf', '~> 3.0.2'
     s.add_dependency 'googleauth',      '~> 0.5.1'
-    s.add_dependency 'concurrent-ruby'
 
     s.add_development_dependency 'bundler',            '~> 1.9'
     s.add_development_dependency 'facter',             '~> 2.4'