diff --git a/include/zephyr/bluetooth/l2cap.h b/include/zephyr/bluetooth/l2cap.h
index 0117da5ebb9..e7be8fa5f18 100644
--- a/include/zephyr/bluetooth/l2cap.h
+++ b/include/zephyr/bluetooth/l2cap.h
@@ -547,10 +547,11 @@ int bt_l2cap_ecred_chan_connect(struct bt_conn *conn,
  *  @param chans Array of channel objects. Null-terminated. Elements after the
  *               first 5 are silently ignored.
  *  @param mtu Channel MTU to reconfigure to.
+ *  @param mps Channel MPS to reconfigure to.
  *
  *  @return 0 in case of success or negative value in case of error.
  */
-int bt_l2cap_ecred_chan_reconfigure(struct bt_l2cap_chan **chans, uint16_t mtu);
+int bt_l2cap_ecred_chan_reconfigure(struct bt_l2cap_chan **chans, uint16_t mtu, uint16_t mps);
 
 /** @brief Connect L2CAP channel
  *
diff --git a/subsys/bluetooth/host/att.c b/subsys/bluetooth/host/att.c
index f5bca16d8d2..0f5ba2cba74 100644
--- a/subsys/bluetooth/host/att.c
+++ b/subsys/bluetooth/host/att.c
@@ -3773,6 +3773,7 @@ int bt_eatt_reconfigure(struct bt_conn *conn, uint16_t mtu)
 	struct bt_l2cap_chan *chans[CONFIG_BT_EATT_MAX + 1] = {};
 	size_t offset = 0;
 	size_t i = 0;
+	uint16_t mps;
 	int err;
 
 	SYS_SLIST_FOR_EACH_CONTAINER(&att->chans, att_chan, node) {
@@ -3783,10 +3784,12 @@ int bt_eatt_reconfigure(struct bt_conn *conn, uint16_t mtu)
 	}
 
 	while (offset < i) {
+		mps = MIN(mtu + BT_L2CAP_SDU_HDR_SIZE, BT_L2CAP_RX_MTU);
+
 		/* bt_l2cap_ecred_chan_reconfigure() uses the first L2CAP_ECRED_CHAN_MAX_PER_REQ
 		 * elements of the array or until a null-terminator is reached.
 		 */
-		err = bt_l2cap_ecred_chan_reconfigure(&chans[offset], mtu);
+		err = bt_l2cap_ecred_chan_reconfigure(&chans[offset], mtu, mps);
 		if (err < 0) {
 			return err;
 		}
diff --git a/subsys/bluetooth/host/l2cap.c b/subsys/bluetooth/host/l2cap.c
index 69197326df2..067d41d5a0d 100644
--- a/subsys/bluetooth/host/l2cap.c
+++ b/subsys/bluetooth/host/l2cap.c
@@ -2944,12 +2944,13 @@ static struct bt_l2cap_le_chan *l2cap_find_pending_reconf(struct bt_conn *conn)
 	return NULL;
 }
 
-int bt_l2cap_ecred_chan_reconfigure(struct bt_l2cap_chan **chans, uint16_t mtu)
+int bt_l2cap_ecred_chan_reconfigure(struct bt_l2cap_chan **chans, uint16_t mtu, uint16_t mps)
 {
 	struct bt_l2cap_ecred_reconf_req *req;
 	struct bt_conn *conn = NULL;
 	struct bt_l2cap_le_chan *ch;
 	struct net_buf *buf;
+	bool multiple_chan;
 	uint8_t ident;
 	int i;
 
@@ -2959,6 +2960,16 @@ int bt_l2cap_ecred_chan_reconfigure(struct bt_l2cap_chan **chans, uint16_t mtu)
 		return -EINVAL;
 	}
 
+	if (chans[0] == NULL) {
+		return -EINVAL;
+	}
+
+	if (mps > BT_L2CAP_RX_MTU) {
+		return -EINVAL;
+	}
+
+	multiple_chan = chans[1] != NULL;
+
 	for (i = 0; i < L2CAP_ECRED_CHAN_MAX_PER_REQ; i++) {
 		if (!chans[i]) {
 			break;
@@ -2977,10 +2988,13 @@ int bt_l2cap_ecred_chan_reconfigure(struct bt_l2cap_chan **chans, uint16_t mtu)
 		if (mtu < BT_L2CAP_LE_CHAN(chans[i])->rx.mtu) {
 			return -EINVAL;
 		}
-	}
 
-	if (i == 0) {
-		return -EINVAL;
+		/* MPS is not allowed to decrease when reconfiguring multiple channels.
+		 * Core Specification 3.A.4.27 v6.0
+		 */
+		if (multiple_chan && mps < BT_L2CAP_LE_CHAN(chans[i])->rx.mps) {
+			return -EINVAL;
+		}
 	}
 
 	if (!conn) {
@@ -3007,12 +3021,7 @@ int bt_l2cap_ecred_chan_reconfigure(struct bt_l2cap_chan **chans, uint16_t mtu)
 
 	req = net_buf_add(buf, sizeof(*req));
 	req->mtu = sys_cpu_to_le16(mtu);
-
-	/* MPS shall not be bigger than MTU + BT_L2CAP_SDU_HDR_SIZE
-	 * as the remaining bytes cannot be used.
-	 */
-	req->mps = sys_cpu_to_le16(MIN(mtu + BT_L2CAP_SDU_HDR_SIZE,
-				       BT_L2CAP_RX_MTU));
+	req->mps = sys_cpu_to_le16(mps);
 
 	for (int j = 0; j < i; j++) {
 		ch = BT_L2CAP_LE_CHAN(chans[j]);
diff --git a/subsys/bluetooth/shell/l2cap.c b/subsys/bluetooth/shell/l2cap.c
index a1227534ab8..74e01bb1422 100644
--- a/subsys/bluetooth/shell/l2cap.c
+++ b/subsys/bluetooth/shell/l2cap.c
@@ -282,6 +282,7 @@ static int cmd_ecred_reconfigure(const struct shell *sh, size_t argc, char *argv
 {
 	struct bt_l2cap_chan *l2cap_ecred_chans[] = { &l2ch_chan.ch.chan, NULL };
 	uint16_t mtu;
+	uint16_t mps;
 	int err = 0;
 
 	if (!default_conn) {
@@ -301,7 +302,8 @@ static int cmd_ecred_reconfigure(const struct shell *sh, size_t argc, char *argv
 		return -ENOEXEC;
 	}
 
-	err = bt_l2cap_ecred_chan_reconfigure(l2cap_ecred_chans, mtu);
+	mps = MIN(mtu + BT_L2CAP_SDU_HDR_SIZE, BT_L2CAP_RX_MTU);
+	err = bt_l2cap_ecred_chan_reconfigure(l2cap_ecred_chans, mtu, mps);
 	if (err < 0) {
 		shell_error(sh, "Unable to reconfigure channel (err %d)", err);
 	} else {
diff --git a/tests/bsim/bluetooth/host/l2cap/general/src/main_l2cap_ecred.c b/tests/bsim/bluetooth/host/l2cap/general/src/main_l2cap_ecred.c
index 521e1a6d633..29550955a26 100644
--- a/tests/bsim/bluetooth/host/l2cap/general/src/main_l2cap_ecred.c
+++ b/tests/bsim/bluetooth/host/l2cap/general/src/main_l2cap_ecred.c
@@ -426,12 +426,13 @@ static void send_sdu_concurrently(void)
 static int change_mtu_on_channels(int num_channels, int new_mtu)
 {
 	struct bt_l2cap_chan *reconf_channels[ECRED_CHAN_MAX] = { NULL };
+	uint16_t mps = MIN(new_mtu + BT_L2CAP_SDU_HDR_SIZE, BT_L2CAP_RX_MTU);
 
 	for (int i = 0; i < num_channels; i++) {
 		reconf_channels[i] = &(&channels[i])->le.chan;
 	}
 
-	return bt_l2cap_ecred_chan_reconfigure(reconf_channels, new_mtu);
+	return bt_l2cap_ecred_chan_reconfigure(reconf_channels, new_mtu, mps);
 }
 
 static void test_peripheral_main(void)