diff --git a/Dockerfile b/Dockerfile
index 4a45658..793d9aa 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -21,4 +21,7 @@ COPY . .
 RUN chmod +x cli.js
 RUN chmod +x watcher.py
 
+# Make ephemeral cache directory
+RUN mkdir ./cache
+
 ENTRYPOINT /app/watcher.py