diff --git a/manifest.toml b/manifest.toml
index c8c3e00..0df7720 100644
--- a/manifest.toml
+++ b/manifest.toml
@@ -62,3 +62,7 @@ ram.runtime = "50M"
 
     [resources.apt]
     packages = "python3-dev python3-pip"
+
+    extras.yarn.repo = "deb https://dl.yarnpkg.com/debian/ stable main"
+    extras.yarn.key = "https://dl.yarnpkg.com/debian/pubkey.gpg"
+    extras.yarn.packages = "yarn"