diff --git a/tests/dummy/config/ember-try.js b/tests/dummy/config/ember-try.js
index c0237e7..ef124a1 100644
--- a/tests/dummy/config/ember-try.js
+++ b/tests/dummy/config/ember-try.js
@@ -43,7 +43,7 @@ module.exports = async function () {
         name: 'ember-lts-5.4',
         npm: {
           devDependencies: {
-            'ember-source': '~4.12.0',
+            'ember-source': '~5.4.0',
           },
         },
       },
@@ -51,7 +51,7 @@ module.exports = async function () {
         name: 'ember-lts-5.8',
         npm: {
           devDependencies: {
-            'ember-source': '~4.12.0',
+            'ember-source': '~5.8.0',
           },
         },
       },