diff --git a/manifest.toml b/manifest.toml
index 38d1508..81319db 100644
--- a/manifest.toml
+++ b/manifest.toml
@@ -99,5 +99,10 @@ ram.runtime = "2000M"
         "libtool",
     ]
 
+    [resources.apt.extras.yarn]
+    repo = "deb https://dl.yarnpkg.com/debian/ stable main"
+    key = "https://dl.yarnpkg.com/debian/pubkey.gpg"
+    packages = ["yarn"]
+
     [resources.database]
     type = "postgresql"