diff --git a/.travis.yml b/.travis.yml
index f37533f..6f34ef8 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,15 +3,14 @@ env:
   - ARUBA_TIMEOUT=240
 before_install:
   - gem update --system
-  - gem update bundler
-  - gem cleanup bundler
+  - rvm @default,@global do gem uninstall bundler -v 2.0.2 -x
 cache: bundler
 rvm:
   - 2.3
-  # - 2.4
-  # - 2.5
-  # - 2.6
-  # - ruby-head
+  - 2.4
+  - 2.5
+  - 2.6
+  - ruby-head
 branches:
   only:
     - master
@@ -19,10 +18,10 @@ install:
   - "bundle install --retry 3 --jobs 8"
 gemfile:
   - gemfiles/rails4.2.gemfile
-  # - gemfiles/rails5.0.gemfile
-  # - gemfiles/rails5.1.gemfile
-  # - gemfiles/rails5.2.gemfile
-  # - gemfiles/rails6.0.gemfile
+  - gemfiles/rails5.0.gemfile
+  - gemfiles/rails5.1.gemfile
+  - gemfiles/rails5.2.gemfile
+  - gemfiles/rails6.0.gemfile
 matrix:
   fast_finish: true
   allow_failures: