It's because bundler is too old that bundler tries to bundle AS 5.0.0…

….rc2
rails · Dec 28, 2016 · 8594b29 · 8594b29
1 parent d813d89
commit 8594b29
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/.travis.yml b/.travis.yml
@@ -1,5 +1,7 @@
 sudo: false
 cache: bundler
+before_install: gem update bundler --no-document
+
 rvm:
   - 1.9.3
   - 2.0.0