diff --git a/Gemfile b/Gemfile
index 688f8d499..5df5cc6e4 100644
--- a/Gemfile
+++ b/Gemfile
@@ -12,7 +12,7 @@ group :documentation do
 end
 
 gem 'capybara'
-gem 'ffi', '~> 1.15.5'
+gem 'ffi', '> 1.15.5'
 gem 'rake', '> 12'
 gem 'rubocop', '~> 1.28.2'
 
diff --git a/lib/rspec/rails/matchers/active_job.rb b/lib/rspec/rails/matchers/active_job.rb
index 1bdd323e5..9d1ac7db8 100644
--- a/lib/rspec/rails/matchers/active_job.rb
+++ b/lib/rspec/rails/matchers/active_job.rb
@@ -1,5 +1,6 @@
 require "active_job/base"
 require "active_job/arguments"
+require "rspec/mocks"
 
 module RSpec
   module Rails