diff --git a/.travis.yml b/.travis.yml
index ae1aeb0..9c2e01e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,6 +3,7 @@ rvm:
   - 2.2
   - 2.3
   - 2.4
+  - 2.5
 before_install: gem install bundler
 language: ruby
 script: script/cibuild
diff --git a/History.markdown b/History.markdown
index 38218f8..85ad0e2 100644
--- a/History.markdown
+++ b/History.markdown
@@ -4,6 +4,10 @@
 
   * Use gems config key for Jekyll < 3.5.0 (#255)
 
+### Development Fixes
+
+  * Test against Ruby 2.5 (#260)
+
 ## 2.4.0 / 2017-12-04
 
 ### Minor
diff --git a/jekyll-seo-tag.gemspec b/jekyll-seo-tag.gemspec
index 9ba4c98..7d1529c 100644
--- a/jekyll-seo-tag.gemspec
+++ b/jekyll-seo-tag.gemspec
@@ -30,5 +30,5 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "bundler", "~> 1.15"
   spec.add_development_dependency "html-proofer", "~> 3.7"
   spec.add_development_dependency "rspec", "~> 3.5"
-  spec.add_development_dependency "rubocop", "~> 0.5"
+  spec.add_development_dependency "rubocop", "0.51"
 end