diff --git a/renewAndSendToProxy.sh b/renewAndSendToProxy.sh
index e20aec0..d6ece17 100644
--- a/renewAndSendToProxy.sh
+++ b/renewAndSendToProxy.sh
@@ -17,7 +17,10 @@ TIMEOUT=5
 printf "${GREEN}Hello! renewAndSendToProxy runs. Today is $(date)${NC}\n"
 
 #full path is needed or it is not started when run as cron
-/root/certbot-auto renew > /var/log/dockeroutput.log
+
+#--no-bootstrap: prevent the certbot-auto script from installing OS-level dependencies
+#--no-self-upgrade: revent the certbot-auto script from upgrading itself to newer released versions
+/root/certbot-auto renew --no-bootstrap --no-self-upgrade > /var/log/dockeroutput.log
 
 printf "Docker Flow: Proxy DNS-Name: ${GREEN}$PROXY_ADDRESS${NC}\n";