diff --git a/Gemfile.lock b/Gemfile.lock
index ea4794b5a..91ce042ce 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -13,7 +13,7 @@ GIT
 
 GIT
   remote: https://github.com/rails/rails.git
-  revision: bf81d40a91880c059ce9d0447219385a2c8e4a15
+  revision: 554970f3e9b520bc302a339c13aa1d98866be3aa
   branch: ast-immediate-variants-process-locally
   specs:
     actioncable (8.2.0.alpha)
diff --git a/Gemfile.saas.lock b/Gemfile.saas.lock
index aabe04258..2ab43a2af 100644
--- a/Gemfile.saas.lock
+++ b/Gemfile.saas.lock
@@ -82,7 +82,7 @@ GIT
 
 GIT
   remote: https://github.com/rails/rails.git
-  revision: bf81d40a91880c059ce9d0447219385a2c8e4a15
+  revision: 554970f3e9b520bc302a339c13aa1d98866be3aa
   branch: ast-immediate-variants-process-locally
   specs:
     actioncable (8.2.0.alpha)
diff --git a/test/test_helper.rb b/test/test_helper.rb
index d18f4c9c4..12ab491ed 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -38,7 +38,7 @@ end
 
 module ActiveSupport
   class TestCase
-    parallelize(workers: :number_of_processors)
+    parallelize workers: :number_of_processors, work_stealing: ENV["WORK_STEALING"] != "false"
 
     # Setup all fixtures in test/fixtures/*.yml for all tests in alphabetical order.
     fixtures :all