diff --git a/.editorconfig b/.editorconfig
index 0362eaf..da22b23 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -14,3 +14,6 @@ trim_trailing_whitespace = false
 
 [*.rb]
 indent_size = 2
+
+[*.yml]
+indent_size = 2
diff --git a/.travis.yml b/.travis.yml
index 12f0e3c..147adef 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -16,6 +16,11 @@ env:
     - LC_ALL=en_US.UTF-8
     - LANGUAGE=en_US.UTF-8
 
+# Bundler 2
+# https://docs.travis-ci.com/user/languages/ruby/#bundler-20
+before_install:
+  - gem install bundler
+
 install:
   - script/bootstrap