diff --git a/README.rst b/README.rst
index a8dc530..1a25f1d 100644
--- a/README.rst
+++ b/README.rst
@@ -178,6 +178,18 @@ returning.
 Usage
 =====
 
+In Debianiptables is being replaced by nftables starting with Debian Buster
+But You can use nftables in legacy mode::
+    
+    apt install nftables
+
+Switching to the legacy version::
+
+    update-alternatives --set iptables /usr/sbin/iptables-legacy
+    update-alternatives --set ip6tables /usr/sbin/ip6tables-legacy
+    
+For more info visit https://wiki.debian.org/nftables
+
 To send packets to the queue::
 
     iptables -I <table or chain> <match specification> -j NFQUEUE --queue-num <queue number>
diff --git a/netfilterqueue.c b/netfilterqueue.c
index 7b0cb84..22e2cfd 100644
--- a/netfilterqueue.c
+++ b/netfilterqueue.c
@@ -5386,7 +5386,7 @@ static PyTypeObject __pyx_type_14netfilterqueue_Packet = {
   sizeof(struct __pyx_obj_14netfilterqueue_Packet), /*tp_basicsize*/
   0, /*tp_itemsize*/
   __pyx_tp_dealloc_14netfilterqueue_Packet, /*tp_dealloc*/
-  0, /*tp_print*/
+  0, /*tp_vectorcall_offset*/
   0, /*tp_getattr*/
   0, /*tp_setattr*/
   #if PY_MAJOR_VERSION < 3
@@ -5517,7 +5517,7 @@ static PyTypeObject __pyx_type_14netfilterqueue_NetfilterQueue = {
   sizeof(struct __pyx_obj_14netfilterqueue_NetfilterQueue), /*tp_basicsize*/
   0, /*tp_itemsize*/
   __pyx_tp_dealloc_14netfilterqueue_NetfilterQueue, /*tp_dealloc*/
-  0, /*tp_print*/
+  0, /*tp_vectorcall_offset*/
   0, /*tp_getattr*/
   0, /*tp_setattr*/
   #if PY_MAJOR_VERSION < 3
@@ -6108,12 +6108,12 @@ PyMODINIT_FUNC PyInit_netfilterqueue(void)
   __pyx_vtable_14netfilterqueue_Packet.drop = (PyObject *(*)(struct __pyx_obj_14netfilterqueue_Packet *, int __pyx_skip_dispatch))__pyx_f_14netfilterqueue_6Packet_drop;
   __pyx_vtable_14netfilterqueue_Packet.repeat = (PyObject *(*)(struct __pyx_obj_14netfilterqueue_Packet *, int __pyx_skip_dispatch))__pyx_f_14netfilterqueue_6Packet_repeat;
   if (PyType_Ready(&__pyx_type_14netfilterqueue_Packet) < 0) __PYX_ERR(0, 40, __pyx_L1_error)
-  __pyx_type_14netfilterqueue_Packet.tp_print = 0;
+  __pyx_type_14netfilterqueue_Packet.tp_vectorcall_offset = 0;
   if (__Pyx_SetVtable(__pyx_type_14netfilterqueue_Packet.tp_dict, __pyx_vtabptr_14netfilterqueue_Packet) < 0) __PYX_ERR(0, 40, __pyx_L1_error)
   if (PyObject_SetAttrString(__pyx_m, "Packet", (PyObject *)&__pyx_type_14netfilterqueue_Packet) < 0) __PYX_ERR(0, 40, __pyx_L1_error)
   __pyx_ptype_14netfilterqueue_Packet = &__pyx_type_14netfilterqueue_Packet;
   if (PyType_Ready(&__pyx_type_14netfilterqueue_NetfilterQueue) < 0) __PYX_ERR(0, 151, __pyx_L1_error)
-  __pyx_type_14netfilterqueue_NetfilterQueue.tp_print = 0;
+  __pyx_type_14netfilterqueue_NetfilterQueue.tp_vectorcall_offset = 0;
   if (PyObject_SetAttrString(__pyx_m, "NetfilterQueue", (PyObject *)&__pyx_type_14netfilterqueue_NetfilterQueue) < 0) __PYX_ERR(0, 151, __pyx_L1_error)
   __pyx_ptype_14netfilterqueue_NetfilterQueue = &__pyx_type_14netfilterqueue_NetfilterQueue;
   /*--- Type import code ---*/