diff --git a/.rubocop.yml b/.rubocop.yml
index 84c8d1b7..2665a743 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -16,7 +16,6 @@ AllCops:
   - lib/jekyll/renderer.rb
   - lib/jekyll/site.rb
   - lib/jekyll/static_file.rb
-  - lib/jekyll/theme.rb
   - lib/jekyll/url.rb
   - lib/jekyll/utils.rb
   - lib/jekyll.rb
diff --git a/lib/jekyll/theme.rb b/lib/jekyll/theme.rb
index ed9cc68d..90536de7 100644
--- a/lib/jekyll/theme.rb
+++ b/lib/jekyll/theme.rb
@@ -27,7 +27,7 @@ module Jekyll
 
     def configure_sass
       return unless sass_path
-      require 'sass'
+      require "sass"
       Sass.load_paths << sass_path
     end
 
@@ -38,7 +38,7 @@ module Jekyll
       return unless resolved_dir
 
       path = Jekyll.sanitized_path(root, resolved_dir)
-      path if Dir.exists?(path)
+      path if Dir.exist?(path)
     end
 
     def realpath_for(folder)
@@ -50,7 +50,8 @@ module Jekyll
     def gemspec
       @gemspec ||= Gem::Specification.find_by_name(name)
     rescue Gem::LoadError
-      raise Jekyll::Errors::MissingDependencyException, "The #{name} theme could not be found."
+      raise Jekyll::Errors::MissingDependencyException,
+        "The #{name} theme could not be found."
     end
   end
 end