diff --git a/client_stream.c b/client_stream.c
index 6a6190a..efcec64 100644
--- a/client_stream.c
+++ b/client_stream.c
@@ -40,13 +40,12 @@ static void report_cb(EV_P_ ev_timer *w, int revents)
     }
 }
 
-static int client_stream_send_stop(quicly_stream_t *stream, int err)
+static void client_stream_send_stop(quicly_stream_t *stream, int err)
 {
     fprintf(stderr, "received STOP_SENDING: %i\n", err);
-    return 0;
 }
 
-static int client_stream_receive(quicly_stream_t *stream, size_t off, const void *src, size_t len)
+static void client_stream_receive(quicly_stream_t *stream, size_t off, const void *src, size_t len)
 {
     if(first_receive) {
         bytes_received = 0;
@@ -57,19 +56,16 @@ static int client_stream_receive(quicly_stream_t *stream, size_t off, const void
     }
 
     if(len == 0) {
-        return 0;
+        return;
     }
 
     bytes_received += len;
     quicly_stream_sync_recvbuf(stream, len);
-
-    return 0;
 }
 
-static int client_stream_receive_reset(quicly_stream_t *stream, int err)
+static void client_stream_receive_reset(quicly_stream_t *stream, int err)
 {
     fprintf(stderr, "received RESET_STREAM: %i\n", err);
-    return 0;
 }
 
 static const quicly_stream_callbacks_t client_stream_callbacks = {
diff --git a/extern/quicly b/extern/quicly
index 016c9d8..01869ac 160000
--- a/extern/quicly
+++ b/extern/quicly
@@ -1 +1 @@
-Subproject commit 016c9d8faa2ff4612ec3f487674916d8eddee8c1
+Subproject commit 01869ac2090edc73c8a6e028f535f4f1cb1f8ea8
diff --git a/server.c b/server.c
index eb1e34b..9bd75af 100644
--- a/server.c
+++ b/server.c
@@ -110,12 +110,8 @@ static inline void server_handle_packet(quicly_decoded_packet_t *packet, struct
         // new conn
         int ret = quicly_accept(&conn, &server_ctx, 0, sa, packet, NULL, &next_cid, NULL);
         if(ret != 0) {
-            if(ret == QUICLY_TRANSPORT_ERROR_VERSION_NEGOTIATION) {
-                printf("quicly_accept failed with QUICLY_TRANSPORT_ERROR_VERSION_NEGOTIATION\n");
-            } else {
-                printf("quicly_accept failed with code %i\n", ret);
-            }
-            return; // ignore errors, including QUICLY_TRANSPORT_ERROR_VERSION_NEGOTIATION
+            printf("quicly_accept failed with code %i\n", ret);
+            return;
         }
         ++next_cid.master_id;
         printf("got new connection\n");
diff --git a/server_stream.c b/server_stream.c
index 893dd6a..aacf334 100644
--- a/server_stream.c
+++ b/server_stream.c
@@ -41,7 +41,7 @@ static void server_stream_send_shift(quicly_stream_t *stream, size_t delta)
     s->acked_offset += delta;
 }
 
-static int server_stream_send_emit(quicly_stream_t *stream, size_t off, void *dst, size_t *len, int *wrote_all)
+static void server_stream_send_emit(quicly_stream_t *stream, size_t off, void *dst, size_t *len, int *wrote_all)
 {
     server_stream *s = stream->data;
     uint64_t data_off = s->acked_offset + off;
@@ -56,18 +56,15 @@ static int server_stream_send_emit(quicly_stream_t *stream, size_t off, void *ds
     }
 
     memset(dst, 0x58, *len);
-
-    return 0;
 }
 
-static int server_stream_send_stop(quicly_stream_t *stream, int err)
+static void server_stream_send_stop(quicly_stream_t *stream, int err)
 {
     printf("server_stream_send_stop stream-id=%li\n", stream->stream_id);
     fprintf(stderr, "received STOP_SENDING: %i\n", err);
-    return 0;
 }
 
-static int server_stream_receive(quicly_stream_t *stream, size_t off, const void *src, size_t len)
+static void server_stream_receive(quicly_stream_t *stream, size_t off, const void *src, size_t len)
 {
     //print_escaped((const char*)src, len);
     quicly_stream_sync_recvbuf(stream, len);
@@ -77,15 +74,12 @@ static int server_stream_receive(quicly_stream_t *stream, size_t off, const void
         quicly_stream_sync_sendbuf(stream, 1);
         ev_timer_start(EV_DEFAULT, &((server_stream*)stream->data)->report_timer);
     }
-
-    return 0;
 }
 
-static int server_stream_receive_reset(quicly_stream_t *stream, int err)
+static void server_stream_receive_reset(quicly_stream_t *stream, int err)
 {
     printf("server_stream_receive_reset stream-id=%li\n", stream->stream_id);
     fprintf(stderr, "received RESET_STREAM: %i\n", err);
-    return 0;
 }
 
 static const quicly_stream_callbacks_t server_stream_callbacks = {