diff --git a/.travis.yml b/.travis.yml
index 1e6f0579..f2b6c3ee 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,12 @@
+sudo: required
+dist: trusty
 language: ruby
 rvm:
   - "1.9.3"
-  - "2.2.4"
+before_install:
+  - sudo apt-get -qq update
+  - sudo apt-get install -y build-essential patch libxslt-dev libxml2-dev
+  - gem install --verbose nokogiri -v 1.6.4
+bundler_args: --without production
 script: bundle exec nanoc
 
diff --git a/Gemfile b/Gemfile
index bee8654f..a4681632 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,4 +1,3 @@
-source "http://gems.github.com"
 source "http://rubygems.org"
 
 gem 'nanoc', '~> 3.7.5'
@@ -8,9 +7,11 @@ gem 'systemu', '~> 2.6.5'
 gem 'adsf', '~> 1.2.0'
 gem 'sass', '~> 3.4.21'
 gem 'rdiscount', '~> 2.1.8'
-gem 't', '~> 2.10.0'
 gem 'nokogiri', '~> 1.6.4'
 gem 'feedjira', '~> 2.0.0'
 gem 'ri_cal', '~> 0.8.8'
 gem 'rqrcode_png', '~> 0.1.5'
 
+group :production do
+  gem 't', '~> 2.10.0'
+end
diff --git a/Gemfile.lock b/Gemfile.lock
index 3cdb3513..8b403b6f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,5 +1,4 @@
 GEM
-  remote: http://gems.github.com/
   remote: http://rubygems.org/
   specs:
     addressable (2.4.0)