diff --git a/samples/bluetooth/channel_sounding/connected_cs/initiator/prj.conf b/samples/bluetooth/channel_sounding/connected_cs/initiator/prj.conf
index 2ed92de59e8..c18f598faf4 100644
--- a/samples/bluetooth/channel_sounding/connected_cs/initiator/prj.conf
+++ b/samples/bluetooth/channel_sounding/connected_cs/initiator/prj.conf
@@ -2,6 +2,7 @@ CONFIG_BT=y
 CONFIG_BT_SMP=y
 CONFIG_BT_CENTRAL=y
 CONFIG_BT_GAP_AUTO_UPDATE_CONN_PARAMS=n
+CONFIG_BT_AUTO_PHY_UPDATE=n
 CONFIG_BT_GATT_CLIENT=y
 CONFIG_BT_GATT_DYNAMIC_DB=y
 CONFIG_BT_ATT_PREPARE_COUNT=3
diff --git a/samples/bluetooth/channel_sounding/connected_cs/reflector/prj.conf b/samples/bluetooth/channel_sounding/connected_cs/reflector/prj.conf
index 016d0de98c2..86bb2fb0524 100644
--- a/samples/bluetooth/channel_sounding/connected_cs/reflector/prj.conf
+++ b/samples/bluetooth/channel_sounding/connected_cs/reflector/prj.conf
@@ -2,6 +2,7 @@ CONFIG_BT=y
 CONFIG_BT_SMP=y
 CONFIG_BT_PERIPHERAL=y
 CONFIG_BT_GAP_AUTO_UPDATE_CONN_PARAMS=n
+CONFIG_BT_AUTO_PHY_UPDATE=n
 CONFIG_BT_GATT_CLIENT=y
 CONFIG_BT_CHANNEL_SOUNDING=y