diff --git a/Gemfile b/Gemfile
index 600f694..d005d66 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,6 +1,6 @@
 source 'https://rubygems.org'
 gem 'highline'
-gem 'i18n'
+gem 'i18n', '0.6.9'
 gem 'locale'
 gem 'gpgme'
 
diff --git a/mpw b/mpw
index 6353633..1250bba 100755
--- a/mpw
+++ b/mpw
@@ -7,7 +7,6 @@ require 'rubygems'
 require 'optparse'
 require 'pathname'
 require 'locale'
-require 'set'
 require 'i18n'
 
 APP_ROOT = File.dirname(Pathname.new(__FILE__).realpath)
diff --git a/mpw-server b/mpw-server
index d5b8fa2..688973f 100755
--- a/mpw-server
+++ b/mpw-server
@@ -7,7 +7,6 @@ require 'rubygems'
 require 'optparse'
 require 'pathname'
 require 'locale'
-require 'set'
 require 'i18n'
 
 APP_ROOT = File.dirname(Pathname.new(__FILE__).realpath)
diff --git a/mpw-ssh b/mpw-ssh
index b3c5f70..5674b1e 100755
--- a/mpw-ssh
+++ b/mpw-ssh
@@ -7,7 +7,6 @@ require 'rubygems'
 require 'optparse'
 require 'pathname'
 require 'locale'
-require 'set'
 require 'i18n'
 
 APP_ROOT = File.dirname(Pathname.new(__FILE__).realpath)