Update required Ruby version in documentation

README.md

@@ -30,7 +30,7 @@ To get your environment setup, follow the community setup guide for your operati
 
 If you're familiar with how Rails works and are comfortable setting up your own environment, you can also try out the [**Discourse Advanced Developer Guide**](docs/DEVELOPER-ADVANCED.md), which is aimed primarily at Ubuntu and macOS environments.
 
-Before you get started, ensure you have the following minimum versions: [Ruby 2.4+](http://www.ruby-lang.org/en/downloads/), [PostgreSQL 10+](http://www.postgresql.org/download/), [Redis 2.6+](http://redis.io/download). If you're having trouble, please see our [**TROUBLESHOOTING GUIDE**](docs/TROUBLESHOOTING.md) first!
+Before you get started, ensure you have the following minimum versions: [Ruby 2.5+](http://www.ruby-lang.org/en/downloads/), [PostgreSQL 10+](http://www.postgresql.org/download/), [Redis 2.6+](http://redis.io/download). If you're having trouble, please see our [**TROUBLESHOOTING GUIDE**](docs/TROUBLESHOOTING.md) first!
 
 ## Setting up Discourse
 

docs/DEVELOPER-ADVANCED.md

@@ -21,8 +21,8 @@ To get your Ubuntu 16.04 or 18.04 LTS install up and running to develop Discours
 
     # exit the terminal and open it again to activate RVM
 
-    rvm install 2.5.1
-    rvm --default use 2.5.1 # If this error out check https://rvm.io/integration/gnome-terminal
+    rvm install 2.5.3
+    rvm --default use 2.5.3 # If this error out check https://rvm.io/integration/gnome-terminal
     gem install bundler mailcatcher rake
 
     # Download and install postgresql-10 from https://wiki.postgresql.org/wiki/Apt

docs/DEVELOPMENT-OSX-NATIVE.md

@@ -4,7 +4,7 @@ These instructions assume you have read and understood the **[Discourse Advanced
 
 OS X has become a popular platform for developing Ruby on Rails applications; as such, if you run OS X, you might find it more congenial to work on **[Discourse](http://discourse.org)** in your native environment. These instructions should get you there.
 
-Obviously, if you **already** develop Ruby on OS X, a lot of this will be redundant, because you'll have already done it, or something like it. If that's the case, you may well be able to just install Ruby 2.4+ using RVM and get started! Discourse has enough dependencies, however (note: not a criticism!) that there's a good chance you'll find **something** else in this document that's useful for getting your Discourse development started!
+Obviously, if you **already** develop Ruby on OS X, a lot of this will be redundant, because you'll have already done it, or something like it. If that's the case, you may well be able to just install Ruby 2.5+ using RVM and get started! Discourse has enough dependencies, however (note: not a criticism!) that there's a good chance you'll find **something** else in this document that's useful for getting your Discourse development started!
 
 ## Quick Setup
 
@@ -76,11 +76,11 @@ If you do already have RVM installed, this should make sure everything is up to
     # If autolibs is set to 0-2, it will give an error for things that are missing, instead.
     rvm requirements
 
-Either way, you'll now want to install Ruby 2.4+ (we recommend 2.4.4 or higher).
+Either way, you'll now want to install Ruby 2.5+ (we recommend 2.5.2 or higher).
 
     # Now, install Ruby
-    rvm install 2.4.4
-    rvm use 2.4.4 --default # Careful with this if you're already developing Ruby
+    rvm install 2.5.3
+    rvm use 2.5.3 --default # Careful with this if you're already developing Ruby
 
 ## Git
 

docs/INSTALL.md

@@ -23,7 +23,7 @@ Hosting Rails applications is complicated. Even if you already have Postgres, Re
 
 - [Postgres 10+](http://www.postgresql.org/download/)
 - [Redis 2.6+](http://redis.io/download)
-- [Ruby 2.4+](http://www.ruby-lang.org/en/downloads/) (we recommend 2.4.4 or higher)
+- [Ruby 2.5+](http://www.ruby-lang.org/en/downloads/) (we recommend 2.5.2 or higher)
 
 ## Security
 

docs/TROUBLESHOOTING.md

@@ -4,9 +4,9 @@ Are you having trouble setting up Discourse? Here are some basic things to check
 reaching out to the community for help:
 
 
-1. Are you running Ruby 2.4 or later?
+1. Are you running Ruby 2.5 or later?
 
-   Discourse is designed for Ruby 2.4 or later. We recommend 2.4.4 p296 or later. You can check your version by typing
+   Discourse is designed for Ruby 2.5 or later. We recommend 2.5.2 or later. You can check your version by typing
    `ruby -v` and checking the response.