diff --git a/youtube_summarizer.py b/youtube_summarizer.py
index a45dd65..40ee6fd 100644
--- a/youtube_summarizer.py
+++ b/youtube_summarizer.py
@@ -331,7 +331,7 @@ def apply_ytdlp_cookie_options(
     if browser_spec:
         opts["cookiesfrombrowser"] = browser_spec
     if use_js_challenge_fallback:
-        opts["js_runtimes"] = ["deno", "node"]
+        opts["js_runtimes"] = {"deno": {}, "node": {}}
         opts["remote_components"] = ["ejs:github"]
     return opts