diff --git a/ubuntu/resources/letsencrypt.sh b/ubuntu/resources/letsencrypt.sh
index 1709c13..841fe81 100755
--- a/ubuntu/resources/letsencrypt.sh
+++ b/ubuntu/resources/letsencrypt.sh
@@ -79,10 +79,10 @@ fi
 
 #request the certificates
 if [ .$wilcard_domain = ."true" ]; then
-	dehydrated --cron --domain *.$domain_name --preferred-chain "ISRG Root X1" --alias $domain_alias --config /etc/dehydrated/config --out /etc/dehydrated/certs --challenge dns-01 --hook /etc/dehydrated/hook.sh
+	dehydrated --cron --domain *.$domain_name --preferred-chain "ISRG Root X1" --algo rsa --alias $domain_alias --config /etc/dehydrated/config --out /etc/dehydrated/certs --challenge dns-01 --hook /etc/dehydrated/hook.sh
 fi
 if [ .$wilcard_domain = ."false" ]; then
-	dehydrated --cron  --preferred-chain "ISRG Root X1" --alias $domain_alias --config /etc/dehydrated/config --config /etc/dehydrated/config --out /etc/dehydrated/certs --challenge http-01
+	dehydrated --cron --preferred-chain "ISRG Root X1" --algo rsa --alias $domain_alias --config /etc/dehydrated/config --config /etc/dehydrated/config --out /etc/dehydrated/certs --challenge http-01
 fi
 
 #make sure the nginx ssl directory exists