diff --git a/lib/activity_notification/orm/active_record/notification.rb b/lib/activity_notification/orm/active_record/notification.rb
index b654090..66d542b 100644
--- a/lib/activity_notification/orm/active_record/notification.rb
+++ b/lib/activity_notification/orm/active_record/notification.rb
@@ -45,7 +45,11 @@ class Notification < ::ActiveRecord::Base
         belongs_to :notifier,      polymorphic: true, optional: true
 
         # Serialize parameters Hash
-        serialize  :parameters, Hash
+        if Rails.gem_version >= Gem::Version.new('7.1')
+          serialize  :parameters, coder: Hash
+        else
+          serialize  :parameters, Hash
+        end
 
         validates  :target,        presence: true
         validates  :notifiable,    presence: true
diff --git a/lib/activity_notification/orm/active_record/subscription.rb b/lib/activity_notification/orm/active_record/subscription.rb
index 408cad4..1a990c3 100644
--- a/lib/activity_notification/orm/active_record/subscription.rb
+++ b/lib/activity_notification/orm/active_record/subscription.rb
@@ -14,7 +14,11 @@ class Subscription < ::ActiveRecord::Base
         belongs_to :target,               polymorphic: true
 
         # Serialize parameters Hash
-        serialize  :optional_targets, Hash
+        if Rails.gem_version >= Gem::Version.new('7.1')
+          serialize  :optional_targets, coder: Hash
+        else
+          serialize  :optional_targets, Hash
+        end
 
         validates  :target,               presence: true
         validates  :key,                  presence: true, uniqueness: { scope: :target }