diff --git a/CHANGELOG.md b/CHANGELOG.md
index 06acf84..960b7cc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+# 9.9.1
+
+* Stop sending SignalExceptions to Sentry by default.
+
 # 9.9.0
 
 * Drop support for Ruby 3.0. The minimum required Ruby version is now 3.1.4.
diff --git a/lib/govuk_app_config/govuk_error/configuration.rb b/lib/govuk_app_config/govuk_error/configuration.rb
index 6224b96..be4d5d5 100644
--- a/lib/govuk_app_config/govuk_error/configuration.rb
+++ b/lib/govuk_app_config/govuk_error/configuration.rb
@@ -45,6 +45,7 @@ def set_up_defaults
         "Sinatra::NotFound",
         "Slimmer::IntermittentRetrievalError",
         "Sidekiq::JobRetry::Skip",
+        "SignalException",
       ]
 
       # This will exclude exceptions that are triggered by one of the ignored
diff --git a/lib/govuk_app_config/version.rb b/lib/govuk_app_config/version.rb
index ae6a559..680b18f 100644
--- a/lib/govuk_app_config/version.rb
+++ b/lib/govuk_app_config/version.rb
@@ -1,3 +1,3 @@
 module GovukAppConfig
-  VERSION = "9.9.0".freeze
+  VERSION = "9.9.1".freeze
 end