diff --git a/ts/mod_npm/index.ts b/ts/mod_npm/index.ts
index 1c7763d..f0a013a 100644
--- a/ts/mod_npm/index.ts
+++ b/ts/mod_npm/index.ts
@@ -67,6 +67,7 @@ let publish = async () => {
   }
 
   // -> build it
+  await bash(`yarn install`);
   await bash(`yarn run build`);
 
   // -> make sure npm is authenticated