diff --git a/ruby/Gemfile b/ruby/Gemfile
index 0cb340d..9e5f735 100644
--- a/ruby/Gemfile
+++ b/ruby/Gemfile
@@ -6,5 +6,5 @@ git_source(:github) {|repo_name| "https://github.com/#{repo_name}" }
 
 # gem "rails"
 gem 'openssl', '>=2.0'
-gem 'json', '2.1.0'
+gem 'json', '2.3.0'
 # gem 'base64'
\ No newline at end of file
diff --git a/ruby/Gemfile.lock b/ruby/Gemfile.lock
index 313808c..70a9f2d 100644
--- a/ruby/Gemfile.lock
+++ b/ruby/Gemfile.lock
@@ -1,14 +1,14 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    json (2.1.0)
+    json (2.3.0)
     openssl (2.0.6)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
-  json (= 2.1.0)
+  json (= 2.3.0)
   openssl (>= 2.0)
 
 BUNDLED WITH