diff --git a/brozzler/ydl.py b/brozzler/ydl.py
index 17babcd..07ec095 100644
--- a/brozzler/ydl.py
+++ b/brozzler/ydl.py
@@ -256,6 +256,9 @@ def _build_youtube_dl(worker, destdir, site):
          # file with video and audio."
         "format": "best/bestvideo+bestaudio",
 
+        # --cache-dir local or...
+        "no_cache_dir": True,
+
         ### we do our own logging
         # "logger": logging.getLogger("youtube_dl"),
         "verbose": False,
diff --git a/setup.py b/setup.py
index f5d260a..d59f903 100644
--- a/setup.py
+++ b/setup.py
@@ -32,7 +32,7 @@ def find_package_data(package):
 
 setuptools.setup(
         name='brozzler',
-        version='1.5.20',
+        version='1.5.21',
         description='Distributed web crawling with browsers',
         url='https://github.com/internetarchive/brozzler',
         author='Noah Levitt',