diff --git a/CHANGELOG.md b/CHANGELOG.md
index 65fe0fdf..35066185 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,14 @@
 Changelog
 =========
 
+## TBD
+
+### Enhancements
+
+* Improve performance of `Bugsnag.notify`
+  | [#774](https://github.com/bugsnag/bugsnag-ruby/pull/774)
+  | [sambostock](https://github.com/sambostock)
+
 ## v6.25.1 (5 January 2023)
 
 ### Fixes
diff --git a/lib/bugsnag.rb b/lib/bugsnag.rb
index a25ed6b4..5d002a90 100644
--- a/lib/bugsnag.rb
+++ b/lib/bugsnag.rb
@@ -78,7 +78,7 @@ def configure(validate_api_key=true)
     #
     # Optionally accepts a block to append metadata to the yielded report.
     def notify(exception, auto_notify=false, &block)
-      unless auto_notify.is_a? TrueClass or auto_notify.is_a? FalseClass
+      unless false.equal? auto_notify or true.equal? auto_notify
         configuration.warn("Adding metadata/severity using a hash is no longer supported, please use block syntax instead")
         auto_notify = false
       end