diff --git a/.ruby-version b/.ruby-version
index 35cee72d..73462a5a 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-2.4.3
+2.5.1
diff --git a/Gemfile b/Gemfile
index 00fa9bcb..309eac5b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,4 +1,4 @@
 source 'https://rubygems.org'
-ruby '2.4.3'
+ruby '2.5.1'
 
 gem 'cocoapods', '1.3.1'
diff --git a/README.md b/README.md
index 45ffd494..885b87be 100644
--- a/README.md
+++ b/README.md
@@ -75,7 +75,7 @@ Once complete, you will find a newly built Phoenix app in `build/Release/`. Afte
 
 Phoenix manages dependencies with [CocoaPods](https://cocoapods.org). Note that you do not need CocoaPods for basic development. However, if you want to install new pods or update existing ones, you will also need:
 
-4. [Ruby](https://www.ruby-lang.org) (2.4.3 or higher), it is recommended that you manage Ruby versions with for instance [rbenv](https://github.com/rbenv/rbenv/)
+4. [Ruby](https://www.ruby-lang.org) (2.5.1 or higher), it is recommended that you manage Ruby versions with for instance [rbenv](https://github.com/rbenv/rbenv/)
 5. [Bundler](http://bundler.io)
 6. CocoaPods