diff --git a/packages/ember-simple-auth/addon/authenticators/torii.js b/packages/ember-simple-auth/addon/authenticators/torii.js
index 8d0b25d08..9419742d2 100644
--- a/packages/ember-simple-auth/addon/authenticators/torii.js
+++ b/packages/ember-simple-auth/addon/authenticators/torii.js
@@ -1,9 +1,18 @@
 import RSVP from 'rsvp';
-import { assert } from '@ember/debug';
+import { assert, deprecate } from '@ember/debug';
 import { isPresent, isEmpty } from '@ember/utils';
 import { assign as emberAssign } from '@ember/polyfills';
 import BaseAuthenticator from './base';
 
+deprecate('Ember Simple Auth: The Torii authenticator is deprecated.', false, {
+  id: 'ember-simple-auth.authenticators.torii',
+  until: '5.0.0',
+  for: 'ember-simple-auth',
+  since: {
+    enabled: '4.2.0'
+  }
+});
+
 /**
   Authenticator that wraps the
   [Torii library](https://github.com/Vestorly/torii) and thus allows to connect
@@ -24,6 +33,7 @@ import BaseAuthenticator from './base';
   ```
 
   @class ToriiAuthenticator
+  @deprecated Implement an authenticator that wraps Torii in application code instead
   @module ember-simple-auth/authenticators/torii
   @extends BaseAuthenticator
   @public