Gemfile in neo4j-9.2.1 vs Gemfile in neo4j-9.2.2

@@ -21,9 +21,12 @@
 # gem 'active_attr', github: 'neo4jrb/active_attr', branch: 'performance'
 # gem 'active_attr', path: '../active_attr'
 
 gem 'listen', '< 3.1'
 
+active_model_version = ENV['ACTIVE_MODEL_VERSION']
+gem 'activemodel', "~> #{active_model_version}" if active_model_version
+
 if RUBY_VERSION.to_f < 2.2
   gem 'activemodel', '~> 4.2'
   gem 'activesupport', '~> 4.2'
   gem 'railties', '~> 4.2'
 end