diff --git a/.travis.yml b/.travis.yml
index 2bdda3e..ba65dc4 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,4 +8,4 @@ rvm:
   - 2.5.3
   - 2.6.0
 bundler_args: --without development
-before_install: gem install bundler
+before_install: gem install bundler -v '< 2'