diff --git a/Gemfile b/Gemfile
index f79a21d..7f76f31 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,4 +2,7 @@ source 'https://rubygems.org'
 
 gem 'cmxl', '~> 1.5.0' 
 gem 'roo', '~> 2.10.0'
-gem 'humanize', '~> 2.5.1'
\ No newline at end of file
+gem 'humanize', '~> 2.5.1'
+gem 'base64', '~> 0.2.0'
+gem 'csv', '~> 3.3.2'
+gem 'bigdecimal', '~> 3.1.9'