diff --git a/Dockerfile b/Dockerfile
index 495a99e..032f318 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -7,6 +7,7 @@ ENV EDITOR=vim
 # Install Caddy file server
 ADD https://caddyserver.com/api/download?os=linux&arch=amd64&idempotency=72456813110731 \
         /usr/bin/caddy
+RUN chmod 0555 /usr/bin/caddy
 EXPOSE 9999
 
 COPY requirements.txt ./