diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7b52609..dc9b5fa 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,16 @@
 <!-- This file is generated, please add to it using `knope document-change` in the client-library-templates repo -->
 # Changelog
 
+## 4.22.0 (2026-10-28)
+
+### Features
+
+#### Use Billing Requests instead of Redirect Flows and Payer Authorisations
+
+Redirect Flows and Payer Authorisations are legacy APIs and cannot be used by new integrators. If you use `client.redirect_flows` and `client.payer_authorisations`, migrate to [Billing Requests](https://developer.gocardless.com/api-reference/#billing-requests), which cover the same flows (and more) through a single API. The [integration planner](https://docs.gocardless.com/docs/collect-payments/integration-planner) is a good place to start.
+
+The legacy methods are now marked as deprecated with YARD `@deprecated` tags. Behaviour is unchanged. Documentation tools and IDEs that understand YARD will flag these methods.
+
 ## 4.21.0 (2026-10-26)
 
 ### Features
diff --git a/lib/gocardless_pro/client.rb b/lib/gocardless_pro/client.rb
index 4f80403..0ce62d8 100644
--- a/lib/gocardless_pro/client.rb
+++ b/lib/gocardless_pro/client.rb
@@ -283,7 +283,7 @@ def default_options
           'User-Agent' => "#{user_agent}",
           'Content-Type' => 'application/json',
           'GoCardless-Client-Library' => 'gocardless-pro-ruby',
-          'GoCardless-Client-Version' => '4.21.0',
+          'GoCardless-Client-Version' => '4.22.0',
         },
       }
     end
diff --git a/lib/gocardless_pro/version.rb b/lib/gocardless_pro/version.rb
index e3272b2..857a4e3 100644
--- a/lib/gocardless_pro/version.rb
+++ b/lib/gocardless_pro/version.rb
@@ -3,5 +3,5 @@ module GoCardlessPro
 
 module GoCardlessPro
   # Current version of the GC gem
-  VERSION = '4.21.0'
+  VERSION = '4.22.0'
 end