diff --git a/.travis.yml b/.travis.yml
index 0d5791f..a290d2e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,6 +5,7 @@ rvm:
   - 2.0.0
   - 2.1
   - 2.2
+  - 2.3
 env:
   -
   - ACTION_MAILER_VERSION=3.0.0
@@ -14,6 +15,10 @@ env:
   - ACTION_MAILER_VERSION=4.1.0
   - ACTION_MAILER_VERSION=4.2.0
 
+cache:
+  directories:
+    - vendor/bundle
+
 script: "bundle exec rake spec"
 
 branches: