diff --git a/rootfs/usr/local/etc/docker/init.d/00-named.sh b/rootfs/usr/local/etc/docker/init.d/00-named.sh
index ea05d9a..7a30278 100755
--- a/rootfs/usr/local/etc/docker/init.d/00-named.sh
+++ b/rootfs/usr/local/etc/docker/init.d/00-named.sh
@@ -158,9 +158,9 @@ user_pass="${NAMED_USER_PASS_WORD:-}" # normal user password
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 # Additional predefined variables
 DNS_SERIAL="$(date +'%Y%m%d%S')"
-KEY_DHCP="${KEY_DHCP:-$(__dhcp_key || __tsig_key sha256)}"
-KEY_RNDC="${KEY_RNDC:-$(__rndc_key || __tsig_key sha256)}"
-KEY_BACKUP="${KEY_BACKUP:-$(__backup_key || __tsig_key sha256)}"
+KEY_DHCP="${KEY_DHCP:-$(__dhcp_key || __tsig_key sha512)}"
+KEY_RNDC="${KEY_RNDC:-$(__rndc_key || __tsig_key sha512)}"
+KEY_BACKUP="${KEY_BACKUP:-$(__backup_key || __tsig_key sha512)}"
 KEY_CERTBOT="${KEY_CERTBOT:-$(__certbot_key || __tsig_key sha512)}"
 DNS_ZONE_FILE="$ETC_DIR/zones.conf"
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