diff --git a/deploy/update-logs-dns.sh b/deploy/update-logs-dns.sh
index e2b3e74..6279648 100644
--- a/deploy/update-logs-dns.sh
+++ b/deploy/update-logs-dns.sh
@@ -4,12 +4,14 @@ set -euo pipefail
 cd "$(dirname "$0")/.."
 
 AUTH_FILE="creds/joker_com_dyndns_creds.txt"
-if [[ ! -f "$AUTH_FILE" ]]; then
-  echo "Joker DYNDNS credentials missing at $AUTH_FILE" >&2
+if [[ -f "$AUTH_FILE" ]]; then
+  JOKER_AUTH="$(cat "$AUTH_FILE")"
+elif [[ -n "${JOKER_DYNDNS_USERNAME:-}" && -n "${JOKER_DYNDNS_PASSWORD:-}" ]]; then
+  JOKER_AUTH="${JOKER_DYNDNS_USERNAME}:${JOKER_DYNDNS_PASSWORD}"
+else
+  echo "Joker DYNDNS credentials missing (file $AUTH_FILE or env JOKER_DYNDNS_USERNAME/PASSWORD)" >&2
   exit 1
 fi
-
-JOKER_AUTH="$(cat "$AUTH_FILE")"
 TARGET_IP="${TARGET_IP:-157.180.66.64}"
 LOGS_HOST="${LOGS_HOST:-logs.lomavuokraus.fi}"