diff --git a/Gemfile b/Gemfile
index 2fc5365..bbabfc4 100644
--- a/Gemfile
+++ b/Gemfile
@@ -22,7 +22,7 @@ group :assets do
 end
 
 gem 'jquery-rails'
-gem 'json', '~> 2.0.0'
+gem 'json', '~> 2.3.0'
 # To use ActiveModel has_secure_password
 # gem 'bcrypt-ruby', '~> 3.0.0'
 
diff --git a/Gemfile.lock b/Gemfile.lock
index e9dec95..c7ec71d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -45,16 +45,18 @@ GEM
     jquery-rails (3.1.4)
       railties (>= 3.0, < 5.0)
       thor (>= 0.14, < 2.0)
-    json (2.0.2)
+    json (2.3.0)
     libv8 (3.16.14.17)
     mail (2.4.4)
       i18n (>= 0.4.0)
       mime-types (~> 1.16)
       treetop (~> 1.4.8)
     mime-types (1.25.1)
+    minitest (5.14.1)
     multi_json (1.12.1)
     pg (0.19.0)
     polyglot (0.3.5)
+    power_assert (1.2.0)
     rack (1.4.7)
     rack-cache (1.6.1)
       rack (>= 0.4)
@@ -89,6 +91,8 @@ GEM
       hike (~> 1.2)
       rack (~> 1.0)
       tilt (~> 1.1, != 1.3.0)
+    test-unit (3.3.6)
+      power_assert
     therubyracer (0.12.3)
       libv8 (~> 3.16.14.15)
       ref
@@ -107,10 +111,12 @@ PLATFORMS
 DEPENDENCIES
   coffee-rails (~> 3.2.1)
   jquery-rails
-  json (~> 2.0.0)
+  json (~> 2.3.0)
+  minitest
   pg
   rails (= 3.2.6)
   sass-rails (~> 3.2.3)
+  test-unit
   therubyracer
   uglifier (>= 1.0.3)