.travis.yml in dry-struct-0.4.0 vs .travis.yml in dry-struct-0.5.0

@@ -2,16 +2,19 @@
 dist: trusty
 sudo: required
 bundler_args: --without benchmarks tools
 script:
   - bundle exec rake spec
+before_install:
+  - gem update --system
 after_success:
   - '[ -d coverage ] && bundle exec codeclimate-test-reporter'
 rvm:
-  - 2.2.7
-  - 2.3.3
-  - 2.4.1
-  - jruby-9.1.10.0
+  - 2.2.9
+  - 2.3.6
+  - 2.4.3
+  - 2.5.0
+  - jruby-9.1.15.0
 env:
   global:
     - COVERAGE=true
     - JRUBY_OPTS='--dev -J-Xmx1024M'
 notifications: