diff --git a/html-proofer.gemspec b/html-proofer.gemspec
index 598719f4..cde63ec1 100644
--- a/html-proofer.gemspec
+++ b/html-proofer.gemspec
@@ -19,7 +19,7 @@ Gem::Specification.new do |gem|
 
   gem.add_dependency 'mercenary',       '~> 0.3.2'
   gem.add_dependency 'nokogiri',        '~> 1.9'
-  gem.add_dependency 'colorize',        '~> 0.8'
+  gem.add_dependency 'rainbow',         '~> 3.0'
   gem.add_dependency 'typhoeus',        '~> 1.3'
   gem.add_dependency 'yell',            '~> 2.0'
   gem.add_dependency 'parallel',        '~> 1.3'
diff --git a/lib/html-proofer/log.rb b/lib/html-proofer/log.rb
index 8efba826..1a402b38 100644
--- a/lib/html-proofer/log.rb
+++ b/lib/html-proofer/log.rb
@@ -1,5 +1,5 @@
 require 'yell'
-require 'colorized_string'
+require 'rainbow'
 
 module HTMLProofer
   class Log
@@ -17,7 +17,7 @@ def initialize(log_level)
     def log(level, message)
       color = case level
               when :debug
-                :light_blue
+                :cyan
               when :info
                 :blue
               when :warn
@@ -35,7 +35,7 @@ def log_with_color(level, color, message)
 
     def colorize(color, message)
       if $stdout.isatty && $stderr.isatty
-        ColorizedString.new(message).colorize(color)
+        Rainbow(message).send(color)
       else
         message
       end