diff --git a/.travis.yml b/.travis.yml
index a5b90bac..530870fc 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -10,3 +10,4 @@ rvm:
 
 before_install:
   - gem install bundler
+  - sudo apt-get install -y build-essential libtool libxml2-dev libxslt-dev libreadline6-dev zlib1g-dev
diff --git a/Gemfile.lock b/Gemfile.lock
index 4e225f4c..aa3998b2 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -35,8 +35,8 @@ GEM
     excon (0.62.0)
     factory_girl (4.7.0)
       activesupport (>= 3.0.0)
-    ffi (1.9.10)
-    ffi (1.9.10-java)
+    ffi (1.9.24)
+    ffi (1.9.24-java)
     hashdiff (0.2.3)
     i18n (0.7.0)
     json (1.8.3)
@@ -49,9 +49,9 @@ GEM
     mini_portile2 (2.1.0)
     minitest (5.9.0)
     multi_json (1.13.1)
-    nokogiri (1.6.8.1)
-      mini_portile2 (~> 2.1.0)
-    nokogiri (1.6.8.1-java)
+    nokogiri (1.8.2)
+      mini_portile2 (~> 2.3.0)
+    nokogiri (1.8.2-java)
     pry (0.10.3)
       coderay (~> 1.1.0)
       method_source (~> 0.8.1)