diff --git a/.travis.yml b/.travis.yml
index bd165b1..5a15f03 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -14,7 +14,7 @@ before_install:
   - if [ "$TRAVIS_OS_NAME" == "linux" ]; then sudo apt-get install --assume-yes --quiet gcc-multilib; fi
 install:
   - gem install rspec
-  - gem install rubocop
+  - gem install rubocop -v 0.57.2
 script:
   - cd test && rake ci
   - make -s