diff --git a/aio/content/demos/first-app/yarn.lock b/aio/content/demos/first-app/yarn.lock
index dfdc68271d68..b64c132eaa67 100644
--- a/aio/content/demos/first-app/yarn.lock
+++ b/aio/content/demos/first-app/yarn.lock
@@ -4744,9 +4744,9 @@ image-size@~0.5.0:
   integrity sha512-6TDAlDPZxUFCv+fuOkIoXT/V/f3Qbq8e37p+YOiYrUv3v9cc3/6x78VdfPgFVaB9dZYeLUfKgHRebpkm/oP2VQ==
 
 immutable@^4.0.0:
-  version "4.1.0"
-  resolved "https://registry.npmjs.org/immutable/-/immutable-4.1.0.tgz"
-  integrity sha512-oNkuqVTA8jqG1Q6c+UglTOD1xhC1BtjKI7XkCXRkZHrN5m18/XsnUp8Q89GkQO/z+0WjonSvl0FLhDYftp46nQ==
+  version "4.3.9"
+  resolved "https://registry.yarnpkg.com/immutable/-/immutable-4.3.9.tgz#c98349e05e9c6e2a4d8fe88ac0b363e0d536b544"
+  integrity sha512-ObHy4YN7ycwZOUCLI1/6svfyAFu7vL8RhAvVu/bh/RZW9EPlOyDaQ9jDQWCtdqzaXUjgXZCW1migtHE7YI7UGQ==
 
 import-fresh@^3.0.0, import-fresh@^3.2.1:
   version "3.3.0"