diff --git a/Gemfile b/Gemfile
index 72d7fa39a..f24d05f4a 100644
--- a/Gemfile
+++ b/Gemfile
@@ -3,3 +3,6 @@ source 'https://rubygems.org'
 gem 'github-pages'
 gem 'json', '>= 2.0.0'
 gem 'webrick', '>= 1.8'
+gem 'csv', '~> 3.3'
+gem 'base64', '~> 0.2.0'
+gem 'bigdecimal', '~> 3.1'
diff --git a/Gemfile.lock b/Gemfile.lock
index b966d6772..bb36d1087 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -8,6 +8,8 @@ GEM
       tzinfo (~> 2.0)
     addressable (2.8.1)
       public_suffix (>= 2.0.2, < 6.0)
+    base64 (0.2.0)
+    bigdecimal (3.1.9)
     coffee-script (2.4.1)
       coffee-script-source
       execjs
@@ -15,6 +17,7 @@ GEM
     colorator (1.1.0)
     commonmarker (0.23.10)
     concurrent-ruby (1.2.2)
+    csv (3.3.3)
     dnsruby (1.61.9)
       simpleidn (~> 0.1)
     em-websocket (0.5.3)
@@ -256,6 +259,9 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
+  base64 (~> 0.2.0)
+  bigdecimal (~> 3.1)
+  csv (~> 3.3)
   github-pages
   json (>= 2.0.0)
   webrick (>= 1.8)