diff --git a/go.mod b/go.mod
index 1384d5c..3b29af3 100644
--- a/go.mod
+++ b/go.mod
@@ -9,7 +9,7 @@ require (
 	github.com/libp2p/go-libp2p-core v0.8.0
 	github.com/libp2p/go-libp2p-tls v0.1.3
 	github.com/libp2p/go-netroute v0.1.3
-	github.com/lucas-clemente/quic-go v0.20.0
+	github.com/lucas-clemente/quic-go v0.20.1
 	github.com/minio/sha256-simd v0.1.1
 	github.com/multiformats/go-multiaddr v0.3.1
 	github.com/multiformats/go-multiaddr-fmt v0.1.0
diff --git a/go.sum b/go.sum
index 26a4159..9fc83e0 100644
--- a/go.sum
+++ b/go.sum
@@ -240,8 +240,8 @@ github.com/libp2p/go-sockaddr v0.0.2 h1:tCuXfpA9rq7llM/v834RKc/Xvovy/AqM9kHvTV/j
 github.com/libp2p/go-sockaddr v0.0.2/go.mod h1:syPvOmNs24S3dFVGJA1/mrqdeijPxLV2Le3BRLKd68k=
 github.com/lightstep/lightstep-tracer-common/golang/gogo v0.0.0-20190605223551-bc2310a04743/go.mod h1:qklhhLq1aX+mtWk9cPHPzaBjWImj5ULL6C7HFJtXQMM=
 github.com/lightstep/lightstep-tracer-go v0.18.1/go.mod h1:jlF1pusYV4pidLvZ+XD0UBX0ZE6WURAspgAczcDHrL4=
-github.com/lucas-clemente/quic-go v0.20.0 h1:FSU3YN5VnLafHR27Ejs1r1CYMS7XMyIVDzRewkDLNBw=
-github.com/lucas-clemente/quic-go v0.20.0/go.mod h1:fZq/HUDIM+mW6X6wtzORjC0E/WDBMKe5Hf9bgjISwLk=
+github.com/lucas-clemente/quic-go v0.20.1 h1:hb5m76V8QS/8Nw/suHvXqo3BMHAozvIkcnzpJdpanSk=
+github.com/lucas-clemente/quic-go v0.20.1/go.mod h1:fZq/HUDIM+mW6X6wtzORjC0E/WDBMKe5Hf9bgjISwLk=
 github.com/lunixbochs/vtclean v1.0.0/go.mod h1:pHhQNgMf3btfWnGBVipUOjRYhoOsdGqdm/+2c2E2WMI=
 github.com/lyft/protoc-gen-validate v0.0.13/go.mod h1:XbGvPuh87YZc5TdIa2/I4pLk0QoUACkjt2znoq26NVQ=
 github.com/mailru/easyjson v0.0.0-20190312143242-1de009706dbe/go.mod h1:C1wdFJiN94OJF2b5HbByQZoLdCWB1Yqtg26g4irojpc=
diff --git a/tracer_metrics.go b/tracer_metrics.go
index 773dfe9..1eab55d 100644
--- a/tracer_metrics.go
+++ b/tracer_metrics.go
@@ -212,7 +212,7 @@ func (m *metricsConnTracer) getEncLevel(packetType logging.PacketType) string {
 	}
 }
 
-func (m *metricsConnTracer) StartedConnection(net.Addr, net.Addr, logging.VersionNumber, logging.ConnectionID, logging.ConnectionID) {
+func (m *metricsConnTracer) StartedConnection(net.Addr, net.Addr, logging.ConnectionID, logging.ConnectionID) {
 	m.startTime = time.Now()
 	collector.AddConn(m.connID.String(), m)
 }
@@ -313,6 +313,8 @@ func (m *metricsConnTracer) UpdatedMetrics(rttStats *logging.RTTStats, cwnd, byt
 	m.mutex.Unlock()
 }
 
+func (m *metricsConnTracer) AcknowledgedPacket(logging.EncryptionLevel, logging.PacketNumber) {}
+
 func (m *metricsConnTracer) LostPacket(level logging.EncryptionLevel, _ logging.PacketNumber, r logging.PacketLossReason) {
 	var reason string
 	switch r {