diff --git a/actioncable/actioncable.gemspec b/actioncable/actioncable.gemspec
index 7aefb67c51..943ca34616 100644
--- a/actioncable/actioncable.gemspec
+++ b/actioncable/actioncable.gemspec
@@ -28,6 +28,7 @@ Gem::Specification.new do |s|
   # NOTE: Please read our dependency guidelines before updating versions:
   # https://edgeguides.rubyonrails.org/security.html#dependency-management-and-cves
 
+  s.add_dependency "activesupport", version
   s.add_dependency "actionpack", version
 
   s.add_dependency "nio4r",            "~> 2.0"
diff --git a/actionmailer/actionmailer.gemspec b/actionmailer/actionmailer.gemspec
index cadccb905b..02dc50f3ec 100644
--- a/actionmailer/actionmailer.gemspec
+++ b/actionmailer/actionmailer.gemspec
@@ -29,6 +29,7 @@ Gem::Specification.new do |s|
   # NOTE: Please read our dependency guidelines before updating versions:
   # https://edgeguides.rubyonrails.org/security.html#dependency-management-and-cves
 
+  s.add_dependency "activesupport", version
   s.add_dependency "actionpack", version
   s.add_dependency "actionview", version
   s.add_dependency "activejob", version
diff --git a/activestorage/activestorage.gemspec b/activestorage/activestorage.gemspec
index 0ae2dcdd3e..51005b406c 100644
--- a/activestorage/activestorage.gemspec
+++ b/activestorage/activestorage.gemspec
@@ -28,9 +28,10 @@ Gem::Specification.new do |s|
   # NOTE: Please read our dependency guidelines before updating versions:
   # https://edgeguides.rubyonrails.org/security.html#dependency-management-and-cves
 
-  s.add_dependency "actionpack",   version
-  s.add_dependency "activejob",    version
-  s.add_dependency "activerecord", version
+  s.add_dependency "activesupport", version
+  s.add_dependency "actionpack",    version
+  s.add_dependency "activejob",     version
+  s.add_dependency "activerecord",  version
 
   s.add_dependency "marcel", "~> 0.3.1"
 end