diff --git a/api/ruby/rendering-data-as-graphs/Gemfile b/api/ruby/rendering-data-as-graphs/Gemfile
index 4145eb9..ebbc60d 100644
--- a/api/ruby/rendering-data-as-graphs/Gemfile
+++ b/api/ruby/rendering-data-as-graphs/Gemfile
@@ -1,6 +1,6 @@
 source "http://rubygems.org"
 
-gem "json", "~>2.1.0"
+gem "json", "~>2.3.0"
 gem "sinatra", "~>1.4.8"
 gem "sinatra_auth_github", "~>1.2.0"
 gem "octokit", "~>4.7.0"
diff --git a/api/ruby/rendering-data-as-graphs/Gemfile.lock b/api/ruby/rendering-data-as-graphs/Gemfile.lock
index 3644d75..8adb780 100644
--- a/api/ruby/rendering-data-as-graphs/Gemfile.lock
+++ b/api/ruby/rendering-data-as-graphs/Gemfile.lock
@@ -12,7 +12,7 @@ GEM
     faraday (0.13.1)
       multipart-post (>= 1.2, < 3)
     i18n (0.8.6)
-    json (2.1.0)
+    json (2.3.0)
     minitest (5.10.3)
     multipart-post (2.0.0)
     octokit (4.7.0)
@@ -46,7 +46,7 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  json (~> 2.1.0)
+  json (~> 2.3.0)
   octokit (~> 4.7.0)
   sinatra (~> 1.4.8)
   sinatra_auth_github (~> 1.2.0)