diff --git a/pyscriptjs/package.json b/pyscriptjs/package.json
index 09002fd..cdf1b84 100644
--- a/pyscriptjs/package.json
+++ b/pyscriptjs/package.json
@@ -31,6 +31,7 @@
     "@codemirror/lang-python": "^0.19.4",
     "@codemirror/theme-one-dark": "^0.19.1",
     "codemirror": "^5.65.2",
-    "sirv-cli": "^1.0.0"
+    "sirv-cli": "^1.0.0",
+    "svelte-promisable-stores": "^0.1.3"
   }
 }