diff --git a/doc/configuration.rst b/doc/configuration.rst
index a9d8adbb9..40f92c98c 100644
--- a/doc/configuration.rst
+++ b/doc/configuration.rst
@@ -261,6 +261,8 @@ all notified sequentially in the specified order.
 A secondary zone may serve as a primary zone for a different set of remotes
 at the same time.
 
+.. _dynamic updates:
+
 Dynamic updates
 ===============
 
diff --git a/doc/man/knot.conf.5in b/doc/man/knot.conf.5in
index 17c4efa4a..c405a6aa2 100644
--- a/doc/man/knot.conf.5in
+++ b/doc/man/knot.conf.5in
@@ -608,6 +608,14 @@ for incoming queries over QUIC protocol.
 Change of this parameter requires restart of the Knot server to take effect.
 .sp
 \fIDefault:\fP not set
+.sp
+\fBNOTE:\fP
+.INDENT 0.0
+.INDENT 3.5
+Incoming DDNS over QUIC isn\(aqt supported.
+The server always responds with SERVFAIL.
+.UNINDENT
+.UNINDENT
 .SH XDP SECTION
 .sp
 Various options related to XDP listening, especially TCP.
diff --git a/doc/reference.rst b/doc/reference.rst
index 874dab95b..b5f19806c 100644
--- a/doc/reference.rst
+++ b/doc/reference.rst
@@ -665,6 +665,10 @@ Change of this parameter requires restart of the Knot server to take effect.
 
 *Default:* not set
 
+.. NOTE::
+   Incoming :ref:`DDNS<dynamic updates>` over QUIC isn't supported.
+   The server always responds with SERVFAIL.
+
 .. _xdp section:
 
 ``xdp`` section
diff --git a/src/knot/nameserver/update.c b/src/knot/nameserver/update.c
index f9b7254b9..1168c9427 100644
--- a/src/knot/nameserver/update.c
+++ b/src/knot/nameserver/update.c
@@ -80,7 +80,7 @@ static int update_enqueue(zone_t *zone, knotd_qdata_t *qdata)
 int update_process_query(knot_pkt_t *pkt, knotd_qdata_t *qdata)
 {
 	/* DDNS over XDP not supported. */
-	if (qdata->params->xdp_msg != NULL) {
+	if (qdata->params->xdp_msg != NULL || qdata->params->proto == KNOTD_QUERY_PROTO_QUIC) {
 		qdata->rcode = KNOT_RCODE_SERVFAIL;
 		return KNOT_STATE_FAIL;
 	}