diff --git a/.ruby-version b/.ruby-version
index 0bee604d..197c4d5c 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-2.3.3
+2.4.0
diff --git a/Dockerfile b/Dockerfile
index 80539446..e97eec0e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ruby:2.3-slim
+FROM ruby:2.4-slim
 MAINTAINER WPScan Team <team@wpscan.org>
 
 RUN DEBIAN_FRONTEND=noninteractive && \
diff --git a/Gemfile b/Gemfile
index 3f6950f1..ed59cabe 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,11 +1,12 @@
 source 'https://rubygems.org'
 
 gem 'typhoeus', '>=1.0.0'
-gem 'nokogiri', '>=1.6.7.2'
+gem 'nokogiri', '>=1.7.0.1'
 gem 'addressable'
 gem 'yajl-ruby' # Better JSON parser regarding memory usage
 gem 'terminal-table', '>=1.6.0'
 gem 'ruby-progressbar', '>=1.6.0'
+gem 'xmlrpc'
 
 group :test do
   gem 'webmock', '>=1.17.2'
diff --git a/lib/common/common_helper.rb b/lib/common/common_helper.rb
index ac065696..28d80930 100644
--- a/lib/common/common_helper.rb
+++ b/lib/common/common_helper.rb
@@ -96,7 +96,9 @@ end
 
 def update_required?
   date = last_update
-  (true if date.nil?) or (date < 5.days.ago)
+  day_seconds = 24 * 60 * 60
+  five_days_ago = Time.now - (5 * day_seconds)
+  (true if date.nil?) or (date < five_days_ago)
 end
 
 # Define colors
diff --git a/lib/common/hacks.rb b/lib/common/hacks.rb
index a68ce576..8b159acb 100644
--- a/lib/common/hacks.rb
+++ b/lib/common/hacks.rb
@@ -35,16 +35,3 @@ class Numeric
     s.sub(/\.?0*$/, ' ' + units[e])
   end
 end
-
-# time calculations
-class Fixnum
-  SECONDS_IN_DAY = 24 * 60 * 60
-
-  def days
-    self * SECONDS_IN_DAY
-  end
-
-  def ago
-    Time.now - self
-  end
-end