diff --git a/docker-compose.yml b/docker-compose.yml
index 2552f4c..6bb3e18 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -22,6 +22,7 @@ services:
       # these are basically to make everything canched
       - 'EXTRA_CONFIG2=refresh_pattern ^http:  999999999     1000000000%    999999999 override-expire'
       - 'EXTRA_CONFIG3=refresh_pattern ^https:  999999999     1000000000%    999999999 override-expire'
+      - EXTRA_CONFIG4=cache_deny auth.docker.io
     volumes:
       - squid-4-cache:/var/cache/squid4
     ports: