diff --git a/.travis.yml b/.travis.yml
index 23d73f4..eb4a9c8 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,18 +1,22 @@
 language: ruby
 sudo: false
-rvm:
-  - 2.6.1
-  - 2.5.3
-  - 2.4.5
+rvm: 2.6.2
 jdk:
   - oraclejdk8
-env:
-  matrix:
-    - "RAILS_VERSION=5.2.2.1"
-      "SIMPLE_FORM_VERSION=4.1.0"
-    - "RAILS_VERSION=5.2.2.1"
-      "SIMPLE_FORM_VERSION=3.5.1"
-    - "RAILS_VERSION=5.1.6.2"
-    - "RAILS_VERSION=5.0.7.2"
-  global:
-    - NOKOGIRI_USE_SYSTEM_LIBRARIES=true
+matrix:
+  include:
+    - env: RAILS_VERSION=5.2.2.1
+           SIMPLE_FORM_VERSION=4.1.0
+    - env: RAILS_VERSION=5.2.2.1
+           SIMPLE_FORM_VERSION=4.1.0
+    - rvm: 2.5.3
+      env: RAILS_VERSION=5.1.6.2
+           SIMPLE_FORM_VERSION=4.1.0
+    - rvm: 2.4.5
+      env: RAILS_VERSION=5.0.7.2
+           SIMPLE_FORM_VERSION=4.1.0
+    - rvm: 2.5.3
+      env: RAILS_VERSION=5.1.6.2
+           SIMPLE_FORM_VERSION=3.5.1
+global_env:
+  - NOKOGIRI_USE_SYSTEM_LIBRARIES=true