diff --git a/app/finders/plugin_version/readme.rb b/app/finders/plugin_version/readme.rb
index fe63f5e8..b0d46ff0 100644
--- a/app/finders/plugin_version/readme.rb
+++ b/app/finders/plugin_version/readme.rb
@@ -65,7 +65,7 @@ module WPScan
 
           extracted_versions.flatten!
           # must contain at least one number
-          extracted_versions = extracted_versions.select { |x| x =~ /[0-9]+/ }
+          extracted_versions = extracted_versions.grep(/[0-9]+/)
 
           sorted = extracted_versions.sort do |x, y|
             Gem::Version.new(x) <=> Gem::Version.new(y)
diff --git a/wpscan.gemspec b/wpscan.gemspec
index 6f230591..e04696a5 100644
--- a/wpscan.gemspec
+++ b/wpscan.gemspec
@@ -27,7 +27,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'rake',                '~> 13.0'
   s.add_development_dependency 'rspec',               '~> 3.10.0'
   s.add_development_dependency 'rspec-its',           '~> 1.3.0'
-  s.add_development_dependency 'rubocop',             '~> 1.21.0'
+  s.add_development_dependency 'rubocop',             '~> 1.22.3'
   s.add_development_dependency 'rubocop-performance', '~> 1.12.0'
   s.add_development_dependency 'simplecov',           '~> 0.21.0'
   s.add_development_dependency 'simplecov-lcov',      '~> 0.8.0'