diff --git a/CHANGELOG.md b/CHANGELOG.md
index 39996ed..5c9dcd6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+# 9.11.0
+
+* Add GDS::SSO::PermissionDeniedError to excluded exceptions list ([#366](https://github.com/alphagov/govuk_app_config/pull/366))
+
 # 9.10.0
 
 * Simplify the logic for deciding whether to initialize `GovukPrometheusExporter`. `GovukPrometheusExporter` provides the `/metrics` webserver and "exporter" process for aggregating counters in multi-process apps. govuk_app_config will now always attempt to initialize GovukPrometheusExporter except when running under `rails console`. The `GOVUK_PROMETHEUS_EXPORTER` environment variable no longer has any effect.
diff --git a/lib/govuk_app_config/govuk_error/configuration.rb b/lib/govuk_app_config/govuk_error/configuration.rb
index be4d5d5..c1f5574 100644
--- a/lib/govuk_app_config/govuk_error/configuration.rb
+++ b/lib/govuk_app_config/govuk_error/configuration.rb
@@ -40,6 +40,7 @@ def set_up_defaults
         "CGI::Session::CookieStore::TamperedWithCookie",
         "GdsApi::HTTPIntermittentServerError",
         "GdsApi::TimedOutException",
+        "GDS::SSO::PermissionDeniedError",
         "Mongoid::Errors::DocumentNotFound",
         "Puma::HttpParserError",
         "Sinatra::NotFound",
diff --git a/lib/govuk_app_config/version.rb b/lib/govuk_app_config/version.rb
index c3bfa29..51211b1 100644
--- a/lib/govuk_app_config/version.rb
+++ b/lib/govuk_app_config/version.rb
@@ -1,3 +1,3 @@
 module GovukAppConfig
-  VERSION = "9.10.0".freeze
+  VERSION = "9.11.0".freeze
 end