diff --git a/.gitignore b/.gitignore
index eecf914..0bfdc6a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,6 +7,9 @@
 # Ignore bundler config.
 /.bundle
 
+# Ruby version
+.ruby-version
+
 # Ignore all logfiles and tempfiles.
 /log/*
 /tmp/*
diff --git a/.ruby-version b/.ruby-version
deleted file mode 100644
index 4fd0fe3..0000000
--- a/.ruby-version
+++ /dev/null
@@ -1 +0,0 @@
-2.5.1
\ No newline at end of file
diff --git a/Gemfile b/Gemfile
index 14530c2..3a1e905 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,7 +1,7 @@
 source 'https://rubygems.org'
 git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 
-ruby '2.5.1'
+ruby '>= 2.3.3'
 
 # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
 gem 'rails', '~> 5.2.0'
diff --git a/Gemfile.lock b/Gemfile.lock
index 146651b..5ed0b75 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -387,7 +387,7 @@ DEPENDENCIES
   whenever
 
 RUBY VERSION
-   ruby 2.5.1p57
+   ruby 2.3.3p222
 
 BUNDLED WITH
    1.16.2
diff --git a/INSTALL.md b/INSTALL.md
index afe5a26..0f81678 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -3,7 +3,7 @@
 ## Requirements
 
 Chexpire requires :
-* Ruby 2.5.1 and Bundler
+* Ruby > 2.3.3 and Bundler
 * NodeJS and Yarn
 * MySQL or MariaDB
 
@@ -13,6 +13,8 @@ We are usually running Chexpire on typical POSIX servers like :
 
 It probably works on any system that supports Ruby >2.3, NodeJS >6 and MySQL >5.5. Feel free to report any unexpected incompatibilities.
 
+If you use rbenv, chruby or RVM, you can set your prefered Ruby version in the `.ruby-version` file at the root of the project.
+
 If you are familiar with Ansible, you can use our [Ansible roles](http://forge.evolix.org/projects/ansible-roles) to easily install the requirements : rbenv, mysql, nodejs. Add this to your playbook :
 
 ```
@@ -24,9 +26,9 @@ roles:
 […]
 ```
 
-> NB: the Rbenv `username` variable points to the user that you want to install Rbenv for. If you use this user for the SSH connection of Ansible, you can leave the `{{ ansible_user }}` value.
+> NB: the rbenv `username` variable points to the user that you want to install rbenv for. If you use this user for the SSH connection of Ansible, you can leave the `{{ ansible_user }}` value.
 
-If you want to do manual installations, you can use our Wiki documentations for [Rbenv](https://github.com/rbenv/rbenv/#installation), [NodeJS](https://wiki.evolix.org/HowtoNodeJS#installation), [Yarn](https://wiki.evolix.org/HowtoNodeJS#yarn) and [MariaDB](https://wiki.evolix.org/HowtoMySQL#installation).
+If you want to do manual installations, you can use our Wiki documentations for [rbenv](https://github.com/rbenv/rbenv/#installation), [NodeJS](https://wiki.evolix.org/HowtoNodeJS#installation), [Yarn](https://wiki.evolix.org/HowtoNodeJS#yarn) and [MariaDB](https://wiki.evolix.org/HowtoMySQL#installation).
 
 ## Dependencies