diff --git a/.github/workflows/coverage.yml b/.github/workflows/coverage.yml
index 977df6a02..189221137 100644
--- a/.github/workflows/coverage.yml
+++ b/.github/workflows/coverage.yml
@@ -24,7 +24,7 @@ jobs:
         run: cd build && ctest --output-on-failure
 
       - name: Upload report
-        uses: codecov/codecov-action@v1
+        uses: codecov/codecov-action@v4
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           yml: ./.codecov.yml
diff --git a/src/core/aio.c b/src/core/aio.c
index 27ec6d9c9..1c7e41d16 100644
--- a/src/core/aio.c
+++ b/src/core/aio.c
@@ -755,12 +755,13 @@ nni_sleep_aio(nng_duration ms, nng_aio *aio)
 	default:
 		// If the timeout on the aio is shorter than our sleep time,
 		// then let it still wake up early, but with NNG_ETIMEDOUT.
-		if (ms > aio->a_timeout) {
+		if ((ms == NNG_DURATION_INFINITE) || (ms > aio->a_timeout)) {
 			aio->a_expire_ok = false;
 			ms               = aio->a_timeout;
 		}
 	}
-	aio->a_expire = nni_clock() + ms;
+	aio->a_expire =
+	    ms == NNG_DURATION_INFINITE ? NNI_TIME_NEVER : nni_clock() + ms;
 
 	if ((rv = nni_aio_schedule(aio, nni_sleep_cancel, NULL)) != 0) {
 		nni_aio_finish_error(aio, rv);
diff --git a/src/core/socket.c b/src/core/socket.c
index e501a2da2..c4e16f709 100644
--- a/src/core/socket.c
+++ b/src/core/socket.c
@@ -1485,8 +1485,8 @@ dialer_timer_start_locked(nni_dialer *d)
 	// This algorithm may lead to slight biases because we don't
 	// have a statistically perfect distribution with the modulo of
 	// the random number, but this really doesn't matter.
-	nni_sleep_aio(
-	    back_off ? (int) nni_random() % back_off : 0, &d->d_tmo_aio);
+	nni_sleep_aio(back_off ? (nng_duration) (nni_random() % back_off) : 0,
+	    &d->d_tmo_aio);
 }
 
 void
diff --git a/src/sp/transport.c b/src/sp/transport.c
index 1d895c828..973be40b0 100644
--- a/src/sp/transport.c
+++ b/src/sp/transport.c
@@ -63,6 +63,9 @@ extern void nni_sp_tcp_register(void);
 #ifdef NNG_TRANSPORT_TLS
 extern void nni_sp_tls_register(void);
 #endif
+#ifdef NNG_TRANSPORT_UDP
+extern void nni_sp_udp_register(void);
+#endif
 #ifdef NNG_TRANSPORT_WS
 extern void nni_sp_ws_register(void);
 #endif
@@ -91,6 +94,9 @@ nni_sp_tran_sys_init(void)
 #ifdef NNG_TRANSPORT_TLS
 	nni_sp_tls_register();
 #endif
+#ifdef NNG_TRANSPORT_UDP
+	nni_sp_udp_register();
+#endif
 #ifdef NNG_TRANSPORT_WS
 	nni_sp_ws_register();
 #endif