Do not upgrade to redis >= 5

since Redis >= 3, < 5 is actually a requirement of Action Cable Redis subscription adapter until Rails 7.0.4.

https://github.com/rails/rails/blob/v6.1.7/actioncable/lib/action_cable/subscription_adapter/redis.rb

Gemfile

@@ -97,7 +97,7 @@ gem 'rack-timeout'
 gem 'roadie-rails'
 
 gem 'puma'
-gem 'redis'
+gem 'redis', "< 5"
 gem "hiredis-client"
 gem 'sidekiq'
 gem 'sidekiq-scheduler'

Gemfile.lock

@@ -885,7 +885,7 @@ DEPENDENCIES
   rails_safe_tasks (~> 1.0)
   ransack (~> 2.6.0)
   redcarpet
-  redis
+  redis (< 5)
   responders
   rexml
   roadie-rails
@@ -928,4 +928,4 @@ RUBY VERSION
    ruby 3.0.3p157
 
 BUNDLED WITH
-   2.4.3
+   2.4.4