diff --git a/.travis.yml b/.travis.yml
index 4eb8a4b..cdf5bc6 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,17 +6,16 @@ notifications:
 branches:
   only:
     - master
-
 rvm:
+  - 2.5
   - 2.4
   - 2.3
   - 2.2
-  - 2.1
 env:
   - ""
-  - JEKYLL_VERSION=3.6.2
+  - JEKYLL_VERSION=3.7.0
 matrix:
   include:
     - # GitHub Pages
-      rvm: 2.4.0
+      rvm: 2.4
       env: GH_PAGES=true
diff --git a/jekyll-gist.gemspec b/jekyll-gist.gemspec
index dfdd91f..b9e7448 100644
--- a/jekyll-gist.gemspec
+++ b/jekyll-gist.gemspec
@@ -26,6 +26,6 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "jekyll", ">= 3.0"
   spec.add_development_dependency "rake"
   spec.add_development_dependency "rspec"
-  spec.add_development_dependency "rubocop", "~> 0.51"
+  spec.add_development_dependency "rubocop", "0.51"
   spec.add_development_dependency "webmock"
 end