diff --git a/.clusterfuzzlite/build.sh b/.clusterfuzzlite/build.sh
index 92a24169..e7a9d411 100755
--- a/.clusterfuzzlite/build.sh
+++ b/.clusterfuzzlite/build.sh
@@ -2,8 +2,8 @@
 
 export CXX="${CXX} -lresolv" # required by Go 1.20
 
-compile_go_fuzzer github.com/quic-go/quic-go/fuzzing/frames Fuzz frame_fuzzer
-compile_go_fuzzer github.com/quic-go/quic-go/fuzzing/header Fuzz header_fuzzer
-compile_go_fuzzer github.com/quic-go/quic-go/fuzzing/transportparameters Fuzz transportparameter_fuzzer
-compile_go_fuzzer github.com/quic-go/quic-go/fuzzing/tokens Fuzz token_fuzzer
-compile_go_fuzzer github.com/quic-go/quic-go/fuzzing/handshake Fuzz handshake_fuzzer
+compile_go_fuzzer github.com/refraction-networking/uquic/fuzzing/frames Fuzz frame_fuzzer
+compile_go_fuzzer github.com/refraction-networking/uquic/fuzzing/header Fuzz header_fuzzer
+compile_go_fuzzer github.com/refraction-networking/uquic/fuzzing/transportparameters Fuzz transportparameter_fuzzer
+compile_go_fuzzer github.com/refraction-networking/uquic/fuzzing/tokens Fuzz token_fuzzer
+compile_go_fuzzer github.com/refraction-networking/uquic/fuzzing/handshake Fuzz handshake_fuzzer
diff --git a/.github/workflows/clusterfuzz-lite-pr.yml b/.github/workflows/clusterfuzz-lite-pr.yml
deleted file mode 100644
index c902db19..00000000
--- a/.github/workflows/clusterfuzz-lite-pr.yml
+++ /dev/null
@@ -1,48 +0,0 @@
-name: ClusterFuzzLite PR fuzzing
-on:
-  pull_request:
-    paths:
-      - '**'
-
-permissions: read-all
-jobs:
-  PR:
-    runs-on: ${{ fromJSON(vars['CLUSTERFUZZ_LITE_RUNNER_UBUNTU'] || '"ubuntu-latest"') }}
-    concurrency:
-      group: ${{ github.workflow }}-${{ matrix.sanitizer }}-${{ github.ref }}
-      cancel-in-progress: true
-    strategy:
-      fail-fast: false
-      matrix:
-        sanitizer:
-        - address
-    steps:
-    - name: Build Fuzzers (${{ matrix.sanitizer }})
-      id: build
-      uses: google/clusterfuzzlite/actions/build_fuzzers@v1
-      with:
-        language: go
-        github-token: ${{ secrets.GITHUB_TOKEN }}
-        sanitizer: ${{ matrix.sanitizer }}
-        # Optional but recommended: used to only run fuzzers that are affected
-        # by the PR.
-        # See later section on "Git repo for storage".
-        # storage-repo: https://${{ secrets.PERSONAL_ACCESS_TOKEN }}@github.com/OWNER/STORAGE-REPO-NAME.git
-        # storage-repo-branch: main   # Optional. Defaults to "main"
-        # storage-repo-branch-coverage: gh-pages  # Optional. Defaults to "gh-pages".
-    - name: Run Fuzzers (${{ matrix.sanitizer }})
-      id: run
-      uses: google/clusterfuzzlite/actions/run_fuzzers@v1
-      with:
-        github-token: ${{ secrets.GITHUB_TOKEN }}
-        fuzz-seconds: 480
-        mode: 'code-change'
-        sanitizer: ${{ matrix.sanitizer }}
-        output-sarif: true
-        parallel-fuzzing: true
-        # Optional but recommended: used to download the corpus produced by
-        # batch fuzzing.
-        # See later section on "Git repo for storage".
-        # storage-repo: https://${{ secrets.PERSONAL_ACCESS_TOKEN }}@github.com/OWNER/STORAGE-REPO-NAME.git
-        # storage-repo-branch: main   # Optional. Defaults to "main"
-        # storage-repo-branch-coverage: gh-pages  # Optional. Defaults to "gh-pages".
diff --git a/http3/error.go b/http3/error.go
index b96ebeec..fc41f544 100644
--- a/http3/error.go
+++ b/http3/error.go
@@ -4,7 +4,7 @@ import (
 	"errors"
 	"fmt"
 
-	"github.com/quic-go/quic-go"
+	quic "github.com/refraction-networking/uquic"
 )
 
 // Error is returned from the round tripper (for HTTP clients)
diff --git a/http3/error_test.go b/http3/error_test.go
index 71567128..56aa200b 100644
--- a/http3/error_test.go
+++ b/http3/error_test.go
@@ -3,10 +3,9 @@ package http3
 import (
 	"errors"
 
-	"github.com/quic-go/quic-go"
-
 	. "github.com/onsi/ginkgo/v2"
 	. "github.com/onsi/gomega"
+	quic "github.com/refraction-networking/uquic"
 )
 
 var _ = Describe("HTTP/3 errors", func() {
diff --git a/internal/ackhandler/ecn.go b/internal/ackhandler/ecn.go
index 68415ac6..6eb943c0 100644
--- a/internal/ackhandler/ecn.go
+++ b/internal/ackhandler/ecn.go
@@ -3,9 +3,9 @@ package ackhandler
 import (
 	"fmt"
 
-	"github.com/quic-go/quic-go/internal/protocol"
-	"github.com/quic-go/quic-go/internal/utils"
-	"github.com/quic-go/quic-go/logging"
+	"github.com/refraction-networking/uquic/internal/protocol"
+	"github.com/refraction-networking/uquic/internal/utils"
+	"github.com/refraction-networking/uquic/logging"
 )
 
 type ecnState uint8
diff --git a/internal/ackhandler/ecn_test.go b/internal/ackhandler/ecn_test.go
index ab648d81..644a025c 100644
--- a/internal/ackhandler/ecn_test.go
+++ b/internal/ackhandler/ecn_test.go
@@ -1,10 +1,10 @@
 package ackhandler
 
 import (
-	mocklogging "github.com/quic-go/quic-go/internal/mocks/logging"
-	"github.com/quic-go/quic-go/internal/protocol"
-	"github.com/quic-go/quic-go/internal/utils"
-	"github.com/quic-go/quic-go/logging"
+	mocklogging "github.com/refraction-networking/uquic/internal/mocks/logging"
+	"github.com/refraction-networking/uquic/internal/protocol"
+	"github.com/refraction-networking/uquic/internal/utils"
+	"github.com/refraction-networking/uquic/logging"
 
 	. "github.com/onsi/ginkgo/v2"
 	. "github.com/onsi/gomega"
diff --git a/internal/ackhandler/mock_ecn_handler_test.go b/internal/ackhandler/mock_ecn_handler_test.go
index 194ab891..949268f5 100644
--- a/internal/ackhandler/mock_ecn_handler_test.go
+++ b/internal/ackhandler/mock_ecn_handler_test.go
@@ -1,9 +1,9 @@
 // Code generated by MockGen. DO NOT EDIT.
-// Source: github.com/quic-go/quic-go/internal/ackhandler (interfaces: ECNHandler)
+// Source: github.com/refraction-networking/uquic/internal/ackhandler (interfaces: ECNHandler)
 //
 // Generated by this command:
 //
-//	mockgen -build_flags=-tags=gomock -package ackhandler -destination mock_ecn_handler_test.go github.com/quic-go/quic-go/internal/ackhandler ECNHandler
+//	mockgen -build_flags=-tags=gomock -package ackhandler -destination mock_ecn_handler_test.go github.com/refraction-networking/uquic/internal/ackhandler ECNHandler
 //
 // Package ackhandler is a generated GoMock package.
 package ackhandler
@@ -11,7 +11,7 @@ package ackhandler
 import (
 	reflect "reflect"
 
-	protocol "github.com/quic-go/quic-go/internal/protocol"
+	protocol "github.com/refraction-networking/uquic/internal/protocol"
 	gomock "go.uber.org/mock/gomock"
 )
 
diff --git a/internal/ackhandler/mockgen.go b/internal/ackhandler/mockgen.go
index 55540cd2..b36c0de1 100644
--- a/internal/ackhandler/mockgen.go
+++ b/internal/ackhandler/mockgen.go
@@ -5,5 +5,5 @@ package ackhandler
 //go:generate sh -c "go run go.uber.org/mock/mockgen -build_flags=\"-tags=gomock\"  -package ackhandler -destination mock_sent_packet_tracker_test.go github.com/refraction-networking/uquic/internal/ackhandler SentPacketTracker"
 type SentPacketTracker = sentPacketTracker
 
-//go:generate sh -c "go run go.uber.org/mock/mockgen -build_flags=\"-tags=gomock\"  -package ackhandler -destination mock_ecn_handler_test.go github.com/quic-go/quic-go/internal/ackhandler ECNHandler"
+//go:generate sh -c "go run go.uber.org/mock/mockgen -build_flags=\"-tags=gomock\"  -package ackhandler -destination mock_ecn_handler_test.go github.com/refraction-networking/uquic/internal/ackhandler ECNHandler"
 type ECNHandler = ecnHandler
diff --git a/internal/ackhandler/u_ackhandler.go b/internal/ackhandler/u_ackhandler.go
index 8d590390..00a2a8c0 100644
--- a/internal/ackhandler/u_ackhandler.go
+++ b/internal/ackhandler/u_ackhandler.go
@@ -12,11 +12,12 @@ func NewUAckHandler(
 	initialMaxDatagramSize protocol.ByteCount,
 	rttStats *utils.RTTStats,
 	clientAddressValidated bool,
+	enableECN bool,
 	pers protocol.Perspective,
-	tracer logging.ConnectionTracer,
+	tracer *logging.ConnectionTracer,
 	logger utils.Logger,
 ) (SentPacketHandler, ReceivedPacketHandler) {
-	sph := newSentPacketHandler(initialPacketNumber, initialMaxDatagramSize, rttStats, clientAddressValidated, pers, tracer, logger)
+	sph := newSentPacketHandler(initialPacketNumber, initialMaxDatagramSize, rttStats, clientAddressValidated, enableECN, pers, tracer, logger)
 	return &uSentPacketHandler{
 		sentPacketHandler: sph,
 	}, newReceivedPacketHandler(sph, rttStats, logger)
diff --git a/internal/handshake/u_crypto_setup.go b/internal/handshake/u_crypto_setup.go
index 92074ca8..d6dc16b1 100644
--- a/internal/handshake/u_crypto_setup.go
+++ b/internal/handshake/u_crypto_setup.go
@@ -34,7 +34,7 @@ type uCryptoSetup struct {
 
 	rttStats *utils.RTTStats
 
-	tracer logging.ConnectionTracer
+	tracer *logging.ConnectionTracer
 	logger utils.Logger
 
 	perspective protocol.Perspective
@@ -69,7 +69,7 @@ func NewUCryptoSetupClient(
 	tlsConf *tls.Config,
 	enable0RTT bool,
 	rttStats *utils.RTTStats,
-	tracer logging.ConnectionTracer,
+	tracer *logging.ConnectionTracer,
 	logger utils.Logger,
 	version protocol.VersionNumber,
 	chs *tls.ClientHelloSpec,
@@ -100,7 +100,7 @@ func newUCryptoSetup(
 	connID protocol.ConnectionID,
 	tp *wire.TransportParameters,
 	rttStats *utils.RTTStats,
-	tracer logging.ConnectionTracer,
+	tracer *logging.ConnectionTracer,
 	logger utils.Logger,
 	perspective protocol.Perspective,
 	version protocol.VersionNumber,
diff --git a/internal/mocks/logging/mockgen.go b/internal/mocks/logging/mockgen.go
index 8bf08dc8..a4a7f4f0 100644
--- a/internal/mocks/logging/mockgen.go
+++ b/internal/mocks/logging/mockgen.go
@@ -6,17 +6,17 @@ import (
 	"net"
 	"time"
 
-	"github.com/quic-go/quic-go/logging"
+	"github.com/refraction-networking/uquic/logging"
 )
 
-//go:generate sh -c "go run go.uber.org/mock/mockgen -build_flags=\"-tags=gomock\" -package internal -destination internal/tracer.go github.com/quic-go/quic-go/internal/mocks/logging Tracer"
+//go:generate sh -c "go run go.uber.org/mock/mockgen -build_flags=\"-tags=gomock\" -package internal -destination internal/tracer.go github.com/refraction-networking/uquic/internal/mocks/logging Tracer"
 type Tracer interface {
 	SentPacket(net.Addr, *logging.Header, logging.ByteCount, []logging.Frame)
 	SentVersionNegotiationPacket(_ net.Addr, dest, src logging.ArbitraryLenConnectionID, _ []logging.VersionNumber)
 	DroppedPacket(net.Addr, logging.PacketType, logging.ByteCount, logging.PacketDropReason)
 }
 
-//go:generate sh -c "go run go.uber.org/mock/mockgen -build_flags=\"-tags=gomock\" -package internal -destination internal/connection_tracer.go github.com/quic-go/quic-go/internal/mocks/logging ConnectionTracer"
+//go:generate sh -c "go run go.uber.org/mock/mockgen -build_flags=\"-tags=gomock\" -package internal -destination internal/connection_tracer.go github.com/refraction-networking/uquic/internal/mocks/logging ConnectionTracer"
 type ConnectionTracer interface {
 	StartedConnection(local, remote net.Addr, srcConnID, destConnID logging.ConnectionID)
 	NegotiatedVersion(chosen logging.VersionNumber, clientVersions, serverVersions []logging.VersionNumber)
diff --git a/internal/utils/log_test.go b/internal/utils/log_test.go
index 98b513d4..4be75dff 100644
--- a/internal/utils/log_test.go
+++ b/internal/utils/log_test.go
@@ -82,7 +82,7 @@ var _ = Describe("Log", func() {
 		DefaultLogger.Infof("info")
 		t, err := time.Parse(format, b.String()[:b.Len()-6])
 		Expect(err).ToNot(HaveOccurred())
-		Expect(t).To(BeTemporally("~", time.Now(), 25*time.Hour))
+		Expect(t).To(BeTemporally("~", time.Now(), 48*time.Hour))
 	})
 
 	It("says whether debug is enabled", func() {
diff --git a/mock_batch_conn_test.go b/mock_batch_conn_test.go
index 1ecc4265..7d331957 100644
--- a/mock_batch_conn_test.go
+++ b/mock_batch_conn_test.go
@@ -3,7 +3,7 @@
 //
 // Generated by this command:
 //
-//	mockgen -package quic -self_package github.com/quic-go/quic-go -source sys_conn_oob.go -destination mock_batch_conn_test.go -mock_names batchConn=MockBatchConn
+//	mockgen -package quic -self_package github.com/refraction-networking/uquic -source sys_conn_oob.go -destination mock_batch_conn_test.go -mock_names batchConn=MockBatchConn
 //
 // Package quic is a generated GoMock package.
 package quic
diff --git a/mock_packetconn_test.go b/mock_packetconn_test.go
index f148bb32..6e317e3e 100644
--- a/mock_packetconn_test.go
+++ b/mock_packetconn_test.go
@@ -3,7 +3,7 @@
 //
 // Generated by this command:
 //
-//	mockgen -package quic -self_package github.com/quic-go/quic-go -self_package github.com/quic-go/quic-go -destination mock_packetconn_test.go net PacketConn
+//	mockgen -package quic -self_package github.com/refraction-networking/uquic -self_package github.com/refraction-networking/uquic -destination mock_packetconn_test.go net PacketConn
 //
 // Package quic is a generated GoMock package.
 package quic
diff --git a/mock_raw_conn_test.go b/mock_raw_conn_test.go
index bf4751d9..f7862c62 100644
--- a/mock_raw_conn_test.go
+++ b/mock_raw_conn_test.go
@@ -1,9 +1,9 @@
 // Code generated by MockGen. DO NOT EDIT.
-// Source: github.com/quic-go/quic-go (interfaces: RawConn)
+// Source: github.com/refraction-networking/uquic (interfaces: RawConn)
 //
 // Generated by this command:
 //
-//	mockgen -build_flags=-tags=gomock -package quic -self_package github.com/quic-go/quic-go -destination mock_raw_conn_test.go github.com/quic-go/quic-go RawConn
+//	mockgen -build_flags=-tags=gomock -package quic -self_package github.com/refraction-networking/uquic -destination mock_raw_conn_test.go github.com/refraction-networking/uquic RawConn
 //
 // Package quic is a generated GoMock package.
 package quic
@@ -13,7 +13,7 @@ import (
 	reflect "reflect"
 	time "time"
 
-	protocol "github.com/quic-go/quic-go/internal/protocol"
+	protocol "github.com/refraction-networking/uquic/internal/protocol"
 	gomock "go.uber.org/mock/gomock"
 )
 
diff --git a/u_connection.go b/u_connection.go
index dc118bc6..7c11749c 100644
--- a/u_connection.go
+++ b/u_connection.go
@@ -24,7 +24,7 @@ var newUClientConnection = func(
 	initialPacketNumber protocol.PacketNumber,
 	enable0RTT bool,
 	hasNegotiatedVersion bool,
-	tracer logging.ConnectionTracer,
+	tracer *logging.ConnectionTracer,
 	tracingID uint64,
 	logger utils.Logger,
 	v protocol.VersionNumber,
@@ -67,11 +67,12 @@ var newUClientConnection = func(
 	)
 	s.preSetup()
 	s.ctx, s.ctxCancel = context.WithCancelCause(context.WithValue(context.Background(), ConnectionTracingKey, tracingID))
-	s.sentPacketHandler, s.receivedPacketHandler = ackhandler.NewUAckHandler( // [UQUIC]
+	s.sentPacketHandler, s.receivedPacketHandler = ackhandler.NewUAckHandler(
 		initialPacketNumber,
 		getMaxPacketSize(s.conn.RemoteAddr()),
 		s.rttStats,
-		false, /* has no effect */
+		false, // has no effect
+		s.conn.capabilities().ECN,
 		s.perspective,
 		s.tracer,
 		s.logger,
@@ -82,7 +83,7 @@ var newUClientConnection = func(
 	}
 
 	s.mtuDiscoverer = newMTUDiscoverer(s.rttStats, getMaxPacketSize(s.conn.RemoteAddr()), s.sentPacketHandler.SetMaxDatagramSize)
-	oneRTTStream := newCryptoStream(true)
+	oneRTTStream := newCryptoStream()
 
 	var params *wire.TransportParameters
 
@@ -134,8 +135,7 @@ var newUClientConnection = func(
 			params.MaxDatagramFrameSize = protocol.InvalidByteCount
 		}
 	}
-
-	if s.tracer != nil {
+	if s.tracer != nil && s.tracer.SentTransportParameters != nil {
 		s.tracer.SentTransportParameters(params)
 	}
 	cs := handshake.NewUCryptoSetupClient(