diff --git a/.ruby-version b/.ruby-version
index a4db534a..914ec967 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-2.5.3
\ No newline at end of file
+2.6.0
\ No newline at end of file
diff --git a/Dockerfile b/Dockerfile
index 8b037716..77443edd 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ruby:2.5.3
+FROM ruby:2.6.0
 
 ENV LANG=C.UTF-8
 
diff --git a/Dockerfile-alpine b/Dockerfile-alpine
index c4b78c05..5bd25afe 100644
--- a/Dockerfile-alpine
+++ b/Dockerfile-alpine
@@ -1,4 +1,4 @@
-FROM ruby:2.5.3-alpine
+FROM ruby:2.6.0-alpine
 
 ENV LANG=C.UTF-8
 
diff --git a/Gemfile b/Gemfile
index 4e34292d..31b57064 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,5 +1,5 @@
 source 'https://rubygems.org'
-ruby '2.5.3'
+ruby '2.6.0'
 
 gem 'rake'
 gem 'thor'
diff --git a/Gemfile.lock b/Gemfile.lock
index 9792f3f4..d968a27b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -19,19 +19,19 @@ GEM
     coffee-script-source (1.12.2)
     concurrent-ruby (1.1.4)
     daemons (1.3.1)
-    erubi (1.7.1)
-    ethon (0.11.0)
+    erubi (1.8.0)
+    ethon (0.12.0)
       ffi (>= 1.3.0)
     eventmachine (1.2.7)
     execjs (2.7.0)
     exifr (1.3.5)
-    ffi (1.9.25)
+    ffi (1.10.0)
     fspath (3.1.0)
     highline (2.0.0)
-    html-pipeline (2.9.1)
+    html-pipeline (2.10.0)
       activesupport (>= 2)
       nokogiri (>= 1.4)
-    i18n (1.2.0)
+    i18n (1.5.2)
       concurrent-ruby (~> 1.0)
     image_optim (0.26.3)
       exifr (~> 1.2, >= 1.2.2)
@@ -39,21 +39,21 @@ GEM
       image_size (>= 1.5, < 3)
       in_threads (~> 1.3)
       progress (~> 3.0, >= 3.0.1)
-    image_optim_pack (0.5.1.20181213)
+    image_optim_pack (0.5.1.20190105)
       fspath (>= 2.1, < 4)
       image_optim (~> 0.19)
     image_size (2.0.0)
-    in_threads (1.5.0)
+    in_threads (1.5.1)
     method_source (0.9.2)
     mini_portile2 (2.4.0)
     minitest (5.11.3)
     multi_json (1.13.1)
     mustermann (1.0.3)
-    net-sftp (2.1.3.rc3)
-      net-ssh (>= 2.6.5, < 6.0.0)
-    net-ssh (5.0.2)
-    newrelic_rpm (5.6.0.349)
-    nokogiri (1.9.0)
+    net-sftp (3.0.0.beta1)
+      net-ssh (>= 5.0.0, < 6.0.0)
+    net-ssh (5.1.0)
+    newrelic_rpm (5.7.0.350)
+    nokogiri (1.10.1)
       mini_portile2 (~> 2.4.0)
     options (2.3.2)
     progress (3.5.0)
@@ -64,7 +64,7 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
     rack (2.0.6)
-    rack-protection (2.0.4)
+    rack-protection (2.0.5)
       rack
     rack-ssl-enforcer (0.2.9)
     rack-test (1.1.0)
@@ -74,23 +74,22 @@ GEM
     rb-inotify (0.10.0)
       ffi (~> 1.0)
     rr (1.2.1)
-    sass (3.7.2)
+    sass (3.7.3)
       sass-listen (~> 4.0.0)
     sass-listen (4.0.0)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
-    sinatra (2.0.4)
+    sinatra (2.0.5)
       mustermann (~> 1.0)
       rack (~> 2.0)
-      rack-protection (= 2.0.4)
+      rack-protection (= 2.0.5)
       tilt (~> 2.0)
-    sinatra-contrib (2.0.4)
-      activesupport (>= 4.0.0)
+    sinatra-contrib (2.0.5)
       backports (>= 2.8.2)
       multi_json
       mustermann (~> 1.0)
-      rack-protection (= 2.0.4)
-      sinatra (= 2.0.4)
+      rack-protection (= 2.0.5)
+      sinatra (= 2.0.5)
       tilt (>= 1.3, < 3)
     sprockets (3.7.2)
       concurrent-ruby (~> 1.0)
@@ -121,7 +120,7 @@ GEM
       thread_safe (~> 0.1)
     uglifier (4.1.20)
       execjs (>= 0.3.0, < 3)
-    unicode-display_width (1.4.0)
+    unicode-display_width (1.4.1)
     unicode_utils (1.4.0)
     unix_utils (0.0.15)
     yajl-ruby (1.4.1)
@@ -163,7 +162,7 @@ DEPENDENCIES
   yajl-ruby
 
 RUBY VERSION
-   ruby 2.5.3p105
+   ruby 2.6.0p0
 
 BUNDLED WITH
    1.17.2
diff --git a/README.md b/README.md
index f7ff8c47..837b07ad 100644
--- a/README.md
+++ b/README.md
@@ -18,7 +18,7 @@ Unless you wish to contribute to the project, we recommend using the hosted vers
 
 DevDocs is made of two pieces: a Ruby scraper that generates the documentation and metadata, and a JavaScript app powered by a small Sinatra app.
 
-DevDocs requires Ruby 2.5.3, libcurl, and a JavaScript runtime supported by [ExecJS](https://github.com/rails/execjs#readme) (included in OS X and Windows; [Node.js](https://nodejs.org/en/) on Linux). Once you have these installed, run the following commands:
+DevDocs requires Ruby 2.6.0, libcurl, and a JavaScript runtime supported by [ExecJS](https://github.com/rails/execjs#readme) (included in OS X and Windows; [Node.js](https://nodejs.org/en/) on Linux). Once you have these installed, run the following commands:
 
 ```
 git clone https://github.com/freeCodeCamp/devdocs.git && cd devdocs
diff --git a/lib/docs/core/requester.rb b/lib/docs/core/requester.rb
index 2e7a8571..6c7f5b6a 100644
--- a/lib/docs/core/requester.rb
+++ b/lib/docs/core/requester.rb
@@ -22,7 +22,7 @@ module Docs
     def initialize(options = {})
       @request_options = options.extract!(:request_options)[:request_options].try(:dup) || {}
       options[:max_concurrency] ||= 20
-      options[:pipelining] = false
+      options[:pipelining] = 0
       super
     end
 
diff --git a/lib/docs/core/url.rb b/lib/docs/core/url.rb
index b2eaf658..398babf7 100644
--- a/lib/docs/core/url.rb
+++ b/lib/docs/core/url.rb
@@ -72,7 +72,7 @@ module Docs
 
       if base == dest
         ''
-      elsif dest.start_with? File.join(base, '')
+      elsif dest.start_with?(::File.join(base, ''))
         url.path[(path.length)..-1]
       end
     end