diff --git a/lib/nrf_modem_lib/nrf9x_sockets.c b/lib/nrf_modem_lib/nrf9x_sockets.c
index 6eb7e5442e1..6374a6efb81 100644
--- a/lib/nrf_modem_lib/nrf9x_sockets.c
+++ b/lib/nrf_modem_lib/nrf9x_sockets.c
@@ -203,6 +203,9 @@ static int z_to_nrf_optname(int z_in_level, int z_in_optname,
 		case TLS_DTLS_HANDSHAKE_STATUS:
 			*nrf_out_optname = NRF_SO_SEC_HANDSHAKE_STATUS;
 			break;
+		case TLS_DTLS_FRAG_EXT:
+			*nrf_out_optname = NRF_SO_SEC_DTLS_FRAG_EXT;
+			break;
 		default:
 			retval = -1;
 			break;
diff --git a/tests/lib/nrf_modem_lib/nrf9x_sockets/src/nrf9x_sockets_test.c b/tests/lib/nrf_modem_lib/nrf9x_sockets/src/nrf9x_sockets_test.c
index 8ebcaee4b54..b9c223060d2 100644
--- a/tests/lib/nrf_modem_lib/nrf9x_sockets/src/nrf9x_sockets_test.c
+++ b/tests/lib/nrf_modem_lib/nrf9x_sockets/src/nrf9x_sockets_test.c
@@ -1866,6 +1866,53 @@ void test_nrf9x_socket_offload_sendcb(void)
 	ret = zsock_sendto(fd, data, data_len, flags, &to, 42);
 	TEST_ASSERT_EQUAL(8, ret);
 	TEST_ASSERT_EQUAL(1, sendcb_calls);
+
+	__cmock_nrf_close_ExpectAndReturn(nrf_fd, 0);
+
+	ret = zsock_close(fd);
+
+	TEST_ASSERT_EQUAL(ret, 0);
+}
+
+void test_nrf9x_socket_offload_dtls_frag_ext(void)
+{
+	int ret;
+	int fd;
+	int nrf_fd = NRF_FD;
+	int family = AF_INET;
+	int type = SOCK_STREAM;
+	int proto = IPPROTO_TCP;
+	int data = 0;
+	size_t data_len = sizeof(data);
+
+	__cmock_nrf_socket_ExpectAndReturn(NRF_AF_INET, NRF_SOCK_STREAM, NRF_IPPROTO_TCP, nrf_fd);
+
+	fd = zsock_socket(family, type, proto);
+
+	TEST_ASSERT_EQUAL(fd, 0);
+
+	__cmock_nrf_setsockopt_ExpectAndReturn(nrf_fd, NRF_SOL_SECURE, NRF_SO_SEC_DTLS_FRAG_EXT,
+					       NULL, sizeof(int), 0);
+	__cmock_nrf_setsockopt_IgnoreArg_option_value();
+
+	ret = zsock_setsockopt(fd, SOL_TLS, TLS_DTLS_FRAG_EXT, &data, sizeof(data));
+
+	TEST_ASSERT_EQUAL(ret, 0);
+
+	__cmock_nrf_getsockopt_ExpectAndReturn(nrf_fd, NRF_SOL_SECURE, NRF_SO_SEC_DTLS_FRAG_EXT,
+					       NULL, NULL, 0);
+	__cmock_nrf_getsockopt_IgnoreArg_option_value();
+	__cmock_nrf_getsockopt_IgnoreArg_option_len();
+
+	ret = zsock_getsockopt(fd, SOL_TLS, TLS_DTLS_FRAG_EXT, &data, &data_len);
+
+	TEST_ASSERT_EQUAL(ret, 0);
+
+	__cmock_nrf_close_ExpectAndReturn(nrf_fd, 0);
+
+	ret = zsock_close(fd);
+
+	TEST_ASSERT_EQUAL(ret, 0);
 }
 
 /* It is required to be added to each test. That is because unity's
diff --git a/west.yml b/west.yml
index 68fdde1e8df..e5e5f99b2f0 100644
--- a/west.yml
+++ b/west.yml
@@ -64,7 +64,7 @@ manifest:
     # https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/zephyr/guides/modules.html
     - name: zephyr
       repo-path: sdk-zephyr
-      revision: 71ebd2b14110f5d9fa3cd23873df0d25c276611b
+      revision: pull/3547/head
       import:
         # In addition to the zephyr repository itself, NCS also
         # imports the contents of zephyr/west.yml at the above