diff --git a/CHANGELOG.md b/CHANGELOG.md
index 43ecc418..591fdd68 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,7 @@
 
 Breaking changes:
 
+- [#1131](https://github.com/rails-api/active_model_serializers/pull/1131) Remove Serializer#root_name (@beauby)
 - [#1138](https://github.com/rails-api/active_model_serializers/pull/1138) Introduce Adapter::Base (@bf4)
   * Adapters now inherit Adapter::Base. 'Adapter' is now a module, no longer a class.
     * using a class as a namespace that you also inherit from is complicated and circular at time i.e.
diff --git a/lib/active_model/serializer.rb b/lib/active_model/serializer.rb
index 1e3b0b72..ff6e5217 100644
--- a/lib/active_model/serializer.rb
+++ b/lib/active_model/serializer.rb
@@ -98,10 +98,6 @@ module ActiveModel
       ActiveModel::Serializer::Adapter.lookup(config.adapter)
     end
 
-    def self.root_name
-      name.demodulize.underscore.sub(/_serializer$/, '') if name
-    end
-
     def self.serializers_cache
       @serializers_cache ||= ThreadSafe::Cache.new
     end