diff --git a/ghost/core/core/server/data/migrations/versions/5.85/2024-06-10-14-53-31-add-posts-updated-at-index.js b/ghost/core/core/server/data/migrations/versions/5.85/2024-06-10-14-53-31-add-posts-updated-at-index.js
new file mode 100644
index 000000000000..124e86e5005c
--- /dev/null
+++ b/ghost/core/core/server/data/migrations/versions/5.85/2024-06-10-14-53-31-add-posts-updated-at-index.js
@@ -0,0 +1,4 @@
+// For information on writing migrations, see https://www.notion.so/ghost/Database-migrations-eb5b78c435d741d2b34a582d57c24253
+const {createAddIndexMigration} = require('../../utils');
+
+module.exports = createAddIndexMigration('posts',['updated_at']);
\ No newline at end of file