diff --git a/.travis.yml b/.travis.yml
index 031afa9..c603a66 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -12,19 +12,19 @@ env:
     - NOKOGIRI_USE_SYSTEM_LIBRARIES=true
 matrix:
   include:
-    - rvm: 1.9.3
-      gemfile: gemfiles/2.1.gemfile
-      env: QMAKE=/usr/lib/x86_64-linux-gnu/qt5/bin/qmake
     - rvm: 1.9.3
       gemfile: gemfiles/2.2.gemfile
       env: QMAKE=/usr/lib/x86_64-linux-gnu/qt5/bin/qmake
     - rvm: 1.9.3
       gemfile: gemfiles/2.3.gemfile
       env: QMAKE=/usr/lib/x86_64-linux-gnu/qt5/bin/qmake
+    - rvm: 1.9.3
+      gemfile: gemfiles/2.4.gemfile
+      env: QMAKE=/usr/lib/x86_64-linux-gnu/qt5/bin/qmake
 gemfile:
-  - gemfiles/2.1.gemfile
   - gemfiles/2.2.gemfile
   - gemfiles/2.3.gemfile
+  - gemfiles/2.4.gemfile
 before_install:
   - sudo apt-add-repository -y ppa:ubuntu-sdk-team/ppa
   - sudo apt-get update