diff --git a/activemodel/test/cases/helper.rb b/activemodel/test/cases/helper.rb
index 44c26e4f10..c589fd2c33 100644
--- a/activemodel/test/cases/helper.rb
+++ b/activemodel/test/cases/helper.rb
@@ -1,5 +1,4 @@
 require 'active_model'
-require 'active_support/core_ext/string/access'
 
 # Show backtraces for deprecated behavior for quicker cleanup.
 ActiveSupport::Deprecation.debug = true
diff --git a/activemodel/test/models/project.rb b/activemodel/test/models/project.rb
deleted file mode 100644
index 581b6dc0b3..0000000000
--- a/activemodel/test/models/project.rb
+++ /dev/null
@@ -1,3 +0,0 @@
-class Project
-  include ActiveModel::DeprecatedMassAssignmentSecurity
-end