default gemfile is 6.1

Gemfile

@@ -2,7 +2,7 @@ source 'https://rubygems.org'
 
 gemspec
 
-gem "activerecord", "~> 6.0.3"
+gem "activerecord", "~> 6.1.7"
 gem "mysql2"
 gem "pg"
 gem "sqlite3"

lib/ancestry/has_ancestry.rb

@@ -117,6 +117,7 @@ module Ancestry
   end
 end
 
+require 'active_support'
 ActiveSupport.on_load :active_record do
   extend Ancestry::HasAncestry
 end