We're still testing against old rubies that aren't supported by bundler 2.x

amatsuda · amatsuda · commit 871869b7b3b2 · 2019-01-11T06:32:27.000+09:00
diff --git a/.travis.yml b/.travis.yml
@@ -2,7 +2,7 @@ language: ruby
 cache: bundler
 sudo: false
 
-before_install: gem update bundler
+before_install: gem install bundler -v '<2'
 
 rvm:
   - 1.9.3
