diff --git a/modules/openapi-generator/src/main/resources/ruby-client/gemspec.mustache b/modules/openapi-generator/src/main/resources/ruby-client/gemspec.mustache
index 0fe63c2e47bc..06334b127cb7 100644
--- a/modules/openapi-generator/src/main/resources/ruby-client/gemspec.mustache
+++ b/modules/openapi-generator/src/main/resources/ruby-client/gemspec.mustache
@@ -30,7 +30,6 @@ Gem::Specification.new do |s|
   {{^isFaraday}}
   s.add_runtime_dependency 'typhoeus', '~> 1.0', '>= 1.0.1'
   {{/isFaraday}}
-  s.add_runtime_dependency 'json', '~> 2.1', '>= 2.1.0'
 
   s.add_development_dependency 'rspec', '~> 3.6', '>= 3.6.0'
 
diff --git a/samples/client/petstore/ruby-faraday/petstore.gemspec b/samples/client/petstore/ruby-faraday/petstore.gemspec
index 9ec5502dc6ab..8a77cf9fc5ce 100644
--- a/samples/client/petstore/ruby-faraday/petstore.gemspec
+++ b/samples/client/petstore/ruby-faraday/petstore.gemspec
@@ -28,7 +28,6 @@ Gem::Specification.new do |s|
   s.required_ruby_version = ">= 1.9"
 
   s.add_runtime_dependency 'faraday', '>= 0.14.0'
-  s.add_runtime_dependency 'json', '~> 2.1', '>= 2.1.0'
 
   s.add_development_dependency 'rspec', '~> 3.6', '>= 3.6.0'
 
diff --git a/samples/client/petstore/ruby/petstore.gemspec b/samples/client/petstore/ruby/petstore.gemspec
index d563bfe8e68a..75e36fd2835f 100644
--- a/samples/client/petstore/ruby/petstore.gemspec
+++ b/samples/client/petstore/ruby/petstore.gemspec
@@ -28,7 +28,6 @@ Gem::Specification.new do |s|
   s.required_ruby_version = ">= 1.9"
 
   s.add_runtime_dependency 'typhoeus', '~> 1.0', '>= 1.0.1'
-  s.add_runtime_dependency 'json', '~> 2.1', '>= 2.1.0'
 
   s.add_development_dependency 'rspec', '~> 3.6', '>= 3.6.0'