ActiveSupport::SecureRandom was deprecated in favor of SecureRandom from the standard lib

app/models/mail_handler.rb

@@ -337,7 +337,7 @@ class MailHandler < ActionMailer::Base
       user.lastname = '-' if user.lastname.blank?
 
       user.login = user.mail
-      user.password = ActiveSupport::SecureRandom.hex(5)
+      user.password = SecureRandom.hex(5)
       user.language = Setting.default_language
       user.save ? user : nil
     end

app/models/token.rb

@@ -36,7 +36,7 @@ class Token < ActiveRecord::Base
 private
 
   def self.generate_token_value
-    ActiveSupport::SecureRandom.hex(20)
+    SecureRandom.hex(20)
   end
 
   # Removes obsolete tokens (same user and action)

app/models/user.rb

@@ -632,7 +632,7 @@ class User < Principal
 
   # Returns a 128bits random salt as a hex string (32 chars long)
   def self.generate_salt
-    ActiveSupport::SecureRandom.hex(16)
+    SecureRandom.hex(16)
   end
 
   def initialize_allowance_evaluators

lib/tasks/initializers.rake

@@ -16,7 +16,7 @@ desc 'Generates a configuration file for cookie store sessions.'
 
 file 'config/initializers/session_store.rb' do
   path = Rails.root.join('config/initializers/session_store.rb').to_s
-  secret = ActiveSupport::SecureRandom.hex(40)
+  secret = SecureRandom.hex(40)
   File.open(path, 'w') do |f|
     f.write <<"EOF"
 # This file was generated by 'rake config/initializers/session_store.rb',

test/test_helper.rb

@@ -100,7 +100,7 @@ class ActiveSupport::TestCase
 
     FileUtils.mkdir_p(Rails.root.join('tmp/pages'))
 
-    page_path = Rails.root.join("tmp/pages/#{ActiveSupport::SecureRandom.hex(16)}.html").to_s
+    page_path = Rails.root.join("tmp/pages/#{SecureRandom.hex(16)}.html").to_s
     File.open(page_path, 'w') { |f| f.write(body) }
 
     Launchy.open(page_path)