diff --git a/.travis.yml b/.travis.yml
index 2c31d3e7..67b1eb1c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,6 +2,9 @@ language: ruby
 rvm:
 - 1.9.3
 - 2.0.0
+before_install:
+  - gem update --system 2.4.5 # last known successful Travis build
+  - gem --version
 script: bundle exec rspec
 notifications:
   email:
@@ -11,3 +14,4 @@ notifications:
     on_success: never
   slack:
     secure: BgRAqwHabAtIBgtApDjyUiND2SNxd4sHMgq4ffnJ+EoMme6RSUAeK0G6LLyaGAk6YcpCeWRGOccEpzai87R3ckv6uycUVGxFcTvPmCEClakbUelWovVEyVT3hPLWznxJ8pz3EVB2+5aJnAsTg5M2ZnYtk3a5C1mrPS+WKceE/Ls=
+sudo: false
diff --git a/wraith.gemspec b/wraith.gemspec
index 2f2108cc..e5231c90 100644
--- a/wraith.gemspec
+++ b/wraith.gemspec
@@ -25,7 +25,7 @@ Gem::Specification.new do |spec|
   spec.add_runtime_dependency 'image_size'
   spec.add_runtime_dependency 'anemone'
   spec.add_runtime_dependency 'robotex'
-  spec.add_runtime_dependency 'nokogiri'
+  spec.add_runtime_dependency 'nokogiri', '1.6.7'
   spec.add_runtime_dependency 'log4r'
   spec.add_runtime_dependency 'thor'
   spec.add_runtime_dependency 'parallel'