diff --git a/execjs-pcruntime.gemspec b/execjs-pcruntime.gemspec
index 75bb5f8..6ee04d9 100644
--- a/execjs-pcruntime.gemspec
+++ b/execjs-pcruntime.gemspec
@@ -14,6 +14,7 @@ Gem::Specification.new do |spec|
   spec.license       = 'MIT'
 
   spec.add_dependency 'execjs', '~> 2.0'
+  spec.add_dependency 'json', '>= 2.0'
 
   # Prevent pushing this gem to RubyGems.org. To allow pushes either set the 'allowed_push_host'
   # to allow pushing to a single host or delete this section to allow pushing to any host.
diff --git a/lib/execjs/pcruntime/context_process_runtime.rb b/lib/execjs/pcruntime/context_process_runtime.rb
index e968692..206c17e 100644
--- a/lib/execjs/pcruntime/context_process_runtime.rb
+++ b/lib/execjs/pcruntime/context_process_runtime.rb
@@ -221,7 +221,7 @@ def post_request(socket_path, path, content_type = nil, body = nil)
           result = URI.decode_www_form_component response.body
 
           if response.code == '200'
-            ::JSON.parse(result, create_additions: false) if /\S/.match?(result)
+            ::JSON.parse(result) if /\S/.match?(result)
           else
             # expects ErrorMessage\0StackTrace =~ response.body
             message, stack = result.split "\0"
diff --git a/test/test_execjs.rb b/test/test_execjs.rb
index 061e3cf..17a240a 100644
--- a/test/test_execjs.rb
+++ b/test/test_execjs.rb
@@ -170,10 +170,10 @@ def test_context_call_missing_function
     { 'a' => 1, 'b' => [2, 3] },
     { 'a' => true }
   ].each_with_index do |value, index|
-    json_value = JSON.generate(value, quirks_mode: true)
+    json_value = JSON.generate(value)
 
     define_method("test_json_value_#{index}") do
-      assert_output value, JSON.parse(json_value, quirks_mode: true)
+      assert_output value, JSON.parse(json_value)
     end
 
     define_method("test_exec_value_#{index}") do