diff --git a/.ruby-version b/.ruby-version
index a9eea9a34..d7edb5686 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-ruby-2.3.8
+ruby-2.6.5
diff --git a/Dockerfile b/Dockerfile
index 04e5c8428..a6119a10b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ruby:2.3.8-alpine
+FROM ruby:2.6.5-alpine
 MAINTAINER peng@sleede.com
 
 # Install upgrade system packages
diff --git a/Gemfile b/Gemfile
index a88aec5c8..0d0268f9a 100644
--- a/Gemfile
+++ b/Gemfile
@@ -19,7 +19,7 @@ gem 'sass-rails', '~> 5.0', '>= 5.0.6'
 # Use Uglifier as compressor for JavaScript assets
 gem 'uglifier', '>= 4.1.20'
 # See https://github.com/sstephenson/execjs#readme for more supported runtimes
-gem 'therubyracer', '= 0.12.0', platforms: :ruby
+gem 'therubyracer', '= 0.12.3', platforms: :ruby
 
 # Use jquery as the JavaScript library
 gem 'jquery-rails'
diff --git a/Gemfile.lock b/Gemfile.lock
index 9726ec897..42eb02d7a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -419,8 +419,8 @@ GEM
       ffi
     term-ansicolor (1.7.1)
       tins (~> 1.0)
-    therubyracer (0.12.0)
-      libv8 (~> 3.16.14.0)
+    therubyracer (0.12.3)
+      libv8 (~> 3.16.14.15)
       ref
     thor (1.0.1)
     thread_safe (0.3.6)
@@ -534,11 +534,11 @@ DEPENDENCIES
   spring-watcher-listen (~> 2.0.0)
   stripe (= 5.1.1)
   sys-filesystem
-  therubyracer (= 0.12.0)
+  therubyracer (= 0.12.3)
   uglifier (>= 4.1.20)
   vcr (= 3.0.1)
   web-console (>= 3.3.0)
   webmock
 
 BUNDLED WITH
-   1.17.3
+   2.1.4
diff --git a/README.md b/README.md
index 01a4d8e53..29fb01742 100644
--- a/README.md
+++ b/README.md
@@ -111,7 +111,7 @@ Before reporting an issue, please check if your issue is not listed in the [know
 <a name="related-documentation"></a>
 ## Related Documentation
 
-- [Ruby 2.3.0](http://ruby-doc.org/core-2.3.0/)
+- [Ruby 2.6.5](http://ruby-doc.org/core-2.6.5/)
 - [Ruby on Rails](http://api.rubyonrails.org)
 - [AngularJS](https://docs.angularjs.org/api)
 - [Angular-Bootstrap](http://angular-ui.github.io/bootstrap/)
diff --git a/doc/development_readme.md b/doc/development_readme.md
index 23839225d..7a681f880 100644
--- a/doc/development_readme.md
+++ b/doc/development_readme.md
@@ -93,7 +93,7 @@ This procedure is not easy to follow so if you don't need to write some code for
 10. Install bundler in the current RVM gemset
 
    ```bash
-   gem install bundler --version=1.17.3
+   gem install bundler
    ```
 
 11. Install the required ruby gems and javascript plugins
diff --git a/provision/box_setup.zsh b/provision/box_setup.zsh
index a266beefb..491e2598b 100755
--- a/provision/box_setup.zsh
+++ b/provision/box_setup.zsh
@@ -157,11 +157,11 @@ install_rvm() {
 install_ruby() {
   echo 'Installing Ruby'
   sudo apt-get install -y libxml2-dev libxslt1-dev libpq-dev libidn11-dev
-  rvm install ruby-2.3.8
-  rvm use ruby-2.3.8@global
+  rvm install ruby-2.6.5
+  rvm use ruby-2.6.5@global
   gem update --system --no-doc
   gem update --no-doc
-  rvm use ruby-2.3.8 --default
+  rvm use ruby-2.6.5 --default
   rvm cleanup all
 }