.travis.yml in kitchen-ec2-2.0.0 vs .travis.yml in kitchen-ec2-2.1.0

@@ -3,9 +3,20 @@
 sudo: false
 branches:
   only:
   - master
 rvm:
-  - 2.2.8
-  - 2.3.5
-  - 2.4.2
-  - ruby-head
+  - 2.3.6
+  - 2.4.3
+
+# https://github.com/travis-ci/travis-ci/issues/8978
+matrix:
+  include:
+    - rvm: 2.5.0
+      before_install:
+      - gem update --system
+    - rvm: ruby-head
+      before_install:
+      - gem update --system
+
+allow_failures:
+  - rvm: ruby-head
\ No newline at end of file