diff --git a/.travis.yml b/.travis.yml
index b25fe46..f8acafa 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -33,7 +33,7 @@ matrix:
 #   https://github.com/bundler/bundler/issues/4984
 install:
   - gem update --system 2.6.14
-  - gem install bundler --version 1.12.5
-  - bundle _1.12.5_ install --jobs=3 --retry=3 --path=${BUNDLE_PATH:-vendor/bundle}
+  - gem install bundler --version 1.15.4
+  - bundle _1.15.4_ install --jobs=3 --retry=3 --path=${BUNDLE_PATH:-vendor/bundle}
 script: 
-  - "bundle _1.12.5_ exec rake $CHECK"
+  - "bundle _1.15.4_ exec rake $CHECK"