diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index e5e3f109..6a5edb8a 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -21,7 +21,7 @@ jobs:
       - run: git fetch --force --tags
       - uses: actions/setup-go@v3
         with:
-          go-version: '1.19'
+          go-version: '1.21.7'
           cache: true
       # More assembly might be required: Docker logins, GPG, etc. It all depends
       # on your needs.
diff --git a/Dockerfile b/Dockerfile
index 6186a99e..1b724787 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM --platform=$BUILDPLATFORM golang:1.20-alpine as builder
+FROM --platform=$BUILDPLATFORM golang:1.21-alpine as builder
 
 # Convert TARGETPLATFORM to GOARCH format
 # https://github.com/tonistiigi/xx
@@ -13,6 +13,7 @@ ADD . /src
 WORKDIR /src
 
 ENV GO111MODULE=on
+ENV CGO_ENABLED=0
 
 RUN cd cmd/gost && go env && go build -v
 
diff --git a/cmd/gost/peer.go b/cmd/gost/peer.go
index 6f5b32ce..af062c71 100644
--- a/cmd/gost/peer.go
+++ b/cmd/gost/peer.go
@@ -13,14 +13,16 @@ import (
 )
 
 type peerConfig struct {
-	Strategy    string `json:"strategy"`
-	MaxFails    int    `json:"max_fails"`
-	FailTimeout time.Duration
-	period      time.Duration // the period for live reloading
-	Nodes       []string      `json:"nodes"`
-	group       *gost.NodeGroup
-	baseNodes   []gost.Node
-	stopped     chan struct{}
+	Strategy     string `json:"strategy"`
+	MaxFails     int    `json:"max_fails"`
+	FastestCount int    `json:"fastest_count"` // topN fastest node count
+	FailTimeout  time.Duration
+	period       time.Duration // the period for live reloading
+
+	Nodes     []string `json:"nodes"`
+	group     *gost.NodeGroup
+	baseNodes []gost.Node
+	stopped   chan struct{}
 }
 
 func newPeerConfig() *peerConfig {
@@ -51,6 +53,7 @@ func (cfg *peerConfig) Reload(r io.Reader) error {
 				FailTimeout: cfg.FailTimeout,
 			},
 			&gost.InvalidFilter{},
+			gost.NewFastestFilter(0, cfg.FastestCount),
 		),
 		gost.WithStrategy(gost.NewStrategy(cfg.Strategy)),
 	)
@@ -125,6 +128,8 @@ func (cfg *peerConfig) parse(r io.Reader) error {
 			cfg.Strategy = ss[1]
 		case "max_fails":
 			cfg.MaxFails, _ = strconv.Atoi(ss[1])
+		case "fastest_count":
+			cfg.FastestCount, _ = strconv.Atoi(ss[1])
 		case "fail_timeout":
 			cfg.FailTimeout, _ = time.ParseDuration(ss[1])
 		case "reload":
diff --git a/cmd/gost/route.go b/cmd/gost/route.go
index e6f0c633..360bc2d1 100644
--- a/cmd/gost/route.go
+++ b/cmd/gost/route.go
@@ -66,6 +66,7 @@ func (r *route) parseChain() (*gost.Chain, error) {
 					FailTimeout: nodes[0].GetDuration("fail_timeout"),
 				},
 				&gost.InvalidFilter{},
+				gost.NewFastestFilter(0, nodes[0].GetInt("fastest_count")),
 			),
 			gost.WithStrategy(gost.NewStrategy(nodes[0].Get("strategy"))),
 		)
diff --git a/go.mod b/go.mod
index 144bcbd9..f7515fb2 100644
--- a/go.mod
+++ b/go.mod
@@ -1,21 +1,23 @@
 module github.com/ginuerzh/gost
 
-go 1.20
+go 1.21
 
 replace github.com/templexxx/cpu v0.0.7 => github.com/templexxx/cpu v0.0.10-0.20211111114238-98168dcec14a
 
 require (
-	git.torproject.org/pluggable-transports/goptlib.git v1.2.0
+	git.torproject.org/pluggable-transports/goptlib.git v1.3.0
 	github.com/LiamHaworth/go-tproxy v0.0.0-20190726054950-ef7efd7f24ed
-	github.com/asaskevich/govalidator v0.0.0-20210307081110-f21760c49a8d
+	github.com/asaskevich/govalidator v0.0.0-20230301143203-a9d515a09cc2
 	github.com/go-gost/gosocks4 v0.0.1
 	github.com/go-gost/gosocks5 v0.3.0
 	github.com/go-gost/relay v0.1.1-0.20211123134818-8ef7fd81ffd7
 	github.com/go-gost/tls-dissector v0.0.2-0.20220408131628-aac992c27451
 	github.com/go-log/log v0.2.0
 	github.com/gobwas/glob v0.2.3
-	github.com/gorilla/websocket v1.4.2
-	github.com/klauspost/compress v1.13.6
+	github.com/gorilla/websocket v1.5.1
+	github.com/klauspost/compress v1.17.6
+	github.com/miekg/dns v1.1.58
+	github.com/quic-go/quic-go v0.41.0
 	github.com/mdlayher/vsock v1.2.1
 	github.com/miekg/dns v1.1.47
 	github.com/quic-go/quic-go v0.42.0
@@ -23,12 +25,12 @@ require (
 	github.com/shadowsocks/go-shadowsocks2 v0.1.5
 	github.com/shadowsocks/shadowsocks-go v0.0.0-20200409064450-3e585ff90601
 	github.com/songgao/water v0.0.0-20200317203138-2b4b6d7c09d8
-	github.com/xtaci/kcp-go/v5 v5.6.1
-	github.com/xtaci/smux v1.5.16
+	github.com/xtaci/kcp-go/v5 v5.6.7
+	github.com/xtaci/smux v1.5.24
 	github.com/xtaci/tcpraw v1.2.25
 	gitlab.com/yawning/obfs4.git v0.0.0-20220204003609-77af0cba934d
-	golang.org/x/crypto v0.17.0
-	golang.org/x/net v0.10.0
+	golang.org/x/crypto v0.21.0
+	golang.org/x/net v0.23.0
 )
 
 require (
@@ -37,16 +39,21 @@ require (
 	github.com/coreos/go-iptables v0.6.0 // indirect
 	github.com/dchest/siphash v1.2.2 // indirect
 	github.com/go-task/slim-sprig v0.0.0-20230315185526-52ccab3ef572 // indirect
+	github.com/golang/mock v1.6.0 // indirect
 	github.com/google/gopacket v1.1.19 // indirect
 	github.com/google/pprof v0.0.0-20230131232505-5a9e8f65f08f // indirect
-	github.com/klauspost/cpuid/v2 v2.0.9 // indirect
-	github.com/klauspost/reedsolomon v1.9.15 // indirect
+	github.com/klauspost/cpuid/v2 v2.2.6 // indirect
+	github.com/klauspost/reedsolomon v1.12.0 // indirect
+	github.com/onsi/ginkgo/v2 v2.9.5 // indirect
 	github.com/mdlayher/socket v0.4.1 // indirect
 	github.com/onsi/ginkgo/v2 v2.9.5 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
+	github.com/quic-go/qtls-go1-18 v0.2.0 // indirect
+	github.com/quic-go/qtls-go1-19 v0.2.0 // indirect
+	github.com/quic-go/qtls-go1-20 v0.4.1 // indirect
 	github.com/riobard/go-bloom v0.0.0-20200614022211-cdc8013cb5b3 // indirect
-	github.com/templexxx/cpu v0.0.7 // indirect
-	github.com/templexxx/xorsimd v0.4.1 // indirect
+	github.com/templexxx/cpu v0.1.0 // indirect
+	github.com/templexxx/xorsimd v0.4.2 // indirect
 	github.com/tjfoc/gmsm v1.4.1 // indirect
 	github.com/xtaci/lossyconn v0.0.0-20200209145036-adba10fffc37 // indirect
 	gitlab.com/yawning/edwards25519-extra.git v0.0.0-20211229043746-2f91fcc9fbdb // indirect
@@ -54,7 +61,7 @@ require (
 	golang.org/x/exp v0.0.0-20230203172020-98cc5a0785f9 // indirect
 	golang.org/x/mod v0.11.0 // indirect
 	golang.org/x/sync v0.2.0 // indirect
-	golang.org/x/sys v0.15.0 // indirect
+	golang.org/x/sys v0.18.0 // indirect
 	golang.org/x/text v0.14.0 // indirect
 	golang.org/x/tools v0.9.1 // indirect
 )
diff --git a/go.sum b/go.sum
index 99ee3868..251e98ff 100644
--- a/go.sum
+++ b/go.sum
@@ -2,15 +2,15 @@ cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMT
 filippo.io/edwards25519 v1.0.0-rc.1.0.20210721174708-390f27c3be20 h1:iJoUgXvhagsNMrJrvavw7vu1eG8+hm6jLOxlLFcoODw=
 filippo.io/edwards25519 v1.0.0-rc.1.0.20210721174708-390f27c3be20/go.mod h1:N1IkdkCkiLB6tki+MYJoSx2JTY9NUlxZE7eHn5EwJns=
 git.torproject.org/pluggable-transports/goptlib.git v1.0.0/go.mod h1:YT4XMSkuEXbtqlydr9+OxqFAyspUv0Gr9qhM3B++o/Q=
-git.torproject.org/pluggable-transports/goptlib.git v1.2.0 h1:0qRF7Dw5qXd0FtZkjWUiAh5GTutRtDGL4GXUDJ4qMHs=
-git.torproject.org/pluggable-transports/goptlib.git v1.2.0/go.mod h1:4PBMl1dg7/3vMWSoWb46eGWlrxkUyn/CAJmxhDLAlDs=
+git.torproject.org/pluggable-transports/goptlib.git v1.3.0 h1:G+iuRUblCCC2xnO+0ag1/4+aaM98D5mjWP1M0v9s8a0=
+git.torproject.org/pluggable-transports/goptlib.git v1.3.0/go.mod h1:4PBMl1dg7/3vMWSoWb46eGWlrxkUyn/CAJmxhDLAlDs=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/LiamHaworth/go-tproxy v0.0.0-20190726054950-ef7efd7f24ed h1:eqa6queieK8SvoszxCu0WwH7lSVeL4/N/f1JwOMw1G4=
 github.com/LiamHaworth/go-tproxy v0.0.0-20190726054950-ef7efd7f24ed/go.mod h1:rA52xkgZwql9LRZXWb2arHEFP6qSR48KY2xOfWzEciQ=
 github.com/aead/chacha20 v0.0.0-20180709150244-8b13a72661da h1:KjTM2ks9d14ZYCvmHS9iAKVt9AyzRSqNU1qabPih5BY=
 github.com/aead/chacha20 v0.0.0-20180709150244-8b13a72661da/go.mod h1:eHEWzANqSiWQsof+nXEI9bUVUyV6F53Fp89EuCh2EAA=
-github.com/asaskevich/govalidator v0.0.0-20210307081110-f21760c49a8d h1:Byv0BzEl3/e6D5CLfI0j/7hiIEtvGVFPCZ7Ei2oq8iQ=
-github.com/asaskevich/govalidator v0.0.0-20210307081110-f21760c49a8d/go.mod h1:WaHUgvxTVq04UNunO+XhnAqY/wQc+bxr74GqbsZ/Jqw=
+github.com/asaskevich/govalidator v0.0.0-20230301143203-a9d515a09cc2 h1:DklsrG3dyBCFEj5IhUbnKptjxatkF07cF2ak3yi77so=
+github.com/asaskevich/govalidator v0.0.0-20230301143203-a9d515a09cc2/go.mod h1:WaHUgvxTVq04UNunO+XhnAqY/wQc+bxr74GqbsZ/Jqw=
 github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
 github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
 github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f/go.mod h1:M8M6+tZqaGXZJjfX53e64911xZQV5JYwmTeXPW+k8Sc=
@@ -36,6 +36,9 @@ github.com/go-gost/tls-dissector v0.0.2-0.20220408131628-aac992c27451/go.mod h1:
 github.com/go-log/log v0.2.0 h1:z8i91GBudxD5L3RmF0KVpetCbcGWAV7q1Tw1eRwQM9Q=
 github.com/go-log/log v0.2.0/go.mod h1:xzCnwajcues/6w7lne3yK2QU7DBPW7kqbgPGG5AF65U=
 github.com/go-logr/logr v1.2.4 h1:g01GSCwiDw2xSZfjJ2/T9M+S6pFdcNtFYsp+Y43HYDQ=
+github.com/go-logr/logr v1.2.3 h1:2DntVwHkVopvECVRSlL5PSo9eG+cAkDCuckLubN+rq0=
+github.com/go-task/slim-sprig v0.0.0-20210107165309-348f09dbbbc0 h1:p104kn46Q8WdvHunIJ9dAyjPVtrBPhSr3KT2yUst43I=
+github.com/go-task/slim-sprig v0.0.0-20210107165309-348f09dbbbc0/go.mod h1:fyg7847qk6SyHyPtNmDHnmrv/HOrqktSC+C9fM+CJOE=
 github.com/go-task/slim-sprig v0.0.0-20230315185526-52ccab3ef572 h1:tfuBGBXKqDEevZMzYi5KSi8KkcZtzBcTgAUUtapy0OI=
 github.com/go-task/slim-sprig v0.0.0-20230315185526-52ccab3ef572/go.mod h1:9Pwr4B2jHnOSGXyyzV8ROjYa2ojvAY6HCGYYfMoC3Ls=
 github.com/gobwas/glob v0.2.3 h1:A4xDbljILXROh+kObIiy5kIaPYD8e96x1tgBhUI5J+Y=
@@ -52,11 +55,13 @@ github.com/golang/protobuf v1.4.0-rc.4.0.20200313231945-b860323f09d0/go.mod h1:W
 github.com/golang/protobuf v1.4.0/go.mod h1:jodUvKwWbYaEsadDk5Fwe5c77LiNKVO9IDvqG2KuDX0=
 github.com/golang/protobuf v1.4.2/go.mod h1:oDoupMAO8OvCJWAcko0GGGIgR6R6ocIYbsSw735rRwI=
 github.com/golang/protobuf v1.5.3 h1:KhyjKVUg7Usr/dYsdSqoFveMYd5ko72D+zANwlG1mmg=
+github.com/golang/protobuf v1.5.3/go.mod h1:XVQd3VNwM+JqD3oG2Ue2ip4fOMUkwXdXDdiuN0vRsmY=
 github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
 github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
 github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
 github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.5.9 h1:O2Tfq5qg4qc4AmwVlvv0oLiVAGB7enBSJ2x2DqQFi38=
+github.com/google/go-cmp v0.5.9/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
 github.com/google/gopacket v1.1.19 h1:ves8RnFZPGiFnTS0uPQStjwru6uO6h+nlr9j6fL7kF8=
 github.com/google/gopacket v1.1.19/go.mod h1:iJ8V8n6KS+z2U1A8pUwu8bW5SyEMkXJB8Yo/Vo+TKTo=
 github.com/google/pprof v0.0.0-20230131232505-5a9e8f65f08f h1:gl1DCiSk+mrXXBGPm6CEeS2MkJuMVzAOrXg34oVj1QI=
@@ -83,6 +88,11 @@ github.com/mmcloughlin/avo v0.0.0-20200803215136-443f81d77104/go.mod h1:wqKykBG2
 github.com/onsi/ginkgo/v2 v2.9.5 h1:+6Hr4uxzP4XIUyAkg61dWBw8lb/gc4/X5luuxN/EC+Q=
 github.com/onsi/ginkgo/v2 v2.9.5/go.mod h1:tvAoo1QUJwNEU2ITftXTpR7R1RbCzoZUOs3RonqW57k=
 github.com/onsi/gomega v1.27.6 h1:ENqfyGeS5AX/rlXDd/ETokDz93u0YufY1Pgxuy/PvWE=
+github.com/onsi/ginkgo/v2 v2.8.0 h1:pAM+oBNPrpXRs+E/8spkeGx9QgekbRVyr74EUvRVOUI=
+github.com/onsi/ginkgo/v2 v2.8.0/go.mod h1:6JsQiECmxCa3V5st74AL/AmsV482EDdVrGaVW6z3oYU=
+github.com/onsi/ginkgo/v2 v2.9.5 h1:+6Hr4uxzP4XIUyAkg61dWBw8lb/gc4/X5luuxN/EC+Q=
+github.com/onsi/ginkgo/v2 v2.9.5/go.mod h1:tvAoo1QUJwNEU2ITftXTpR7R1RbCzoZUOs3RonqW57k=
+github.com/onsi/gomega v1.25.0 h1:Vw7br2PCDYijJHSfBOWhov+8cAnUf8MfMaIOV323l6Y=
 github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
 github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
@@ -90,6 +100,20 @@ github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZN
 github.com/prometheus/client_model v0.0.0-20190812154241-14fe0d1b01d4/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
 github.com/quic-go/quic-go v0.42.0 h1:uSfdap0eveIl8KXnipv9K7nlwZ5IqLlYOpJ58u5utpM=
 github.com/quic-go/quic-go v0.42.0/go.mod h1:132kz4kL3F9vxhW3CtQJLDVwcFe5wdWeJXXijhsO57M=
+github.com/quic-go/qtls-go1-18 v0.2.0 h1:5ViXqBZ90wpUcZS0ge79rf029yx0dYB0McyPJwqqj7U=
+github.com/quic-go/qtls-go1-18 v0.2.0/go.mod h1:moGulGHK7o6O8lSPSZNoOwcLvJKJ85vVNc7oJFD65bc=
+github.com/quic-go/qtls-go1-19 v0.2.0 h1:Cvn2WdhyViFUHoOqK52i51k4nDX8EwIh5VJiVM4nttk=
+github.com/quic-go/qtls-go1-19 v0.2.0/go.mod h1:ySOI96ew8lnoKPtSqx2BlI5wCpUVPT05RMAlajtnyOI=
+github.com/quic-go/qtls-go1-20 v0.1.0 h1:d1PK3ErFy9t7zxKsG3NXBJXZjp/kMLoIb3y/kV54oAI=
+github.com/quic-go/qtls-go1-20 v0.1.0/go.mod h1:JKtK6mjbAVcUTN/9jZpvLbGxvdWIKS8uT7EiStoU1SM=
+github.com/quic-go/qtls-go1-20 v0.4.1 h1:D33340mCNDAIKBqXuAvexTNMUByrYmFYVfKfDN5nfFs=
+github.com/quic-go/qtls-go1-20 v0.4.1/go.mod h1:X9Nh97ZL80Z+bX/gUXMbipO6OxdiDi58b/fMC9mAL+k=
+github.com/quic-go/quic-go v0.32.0 h1:lY02md31s1JgPiiyfqJijpu/UX/Iun304FI3yUqX7tA=
+github.com/quic-go/quic-go v0.32.0/go.mod h1:/fCsKANhQIeD5l76c2JFU+07gVE3KaA0FP+0zMWwfwo=
+github.com/quic-go/quic-go v0.40.1 h1:X3AGzUNFs0jVuO3esAGnTfvdgvL4fq655WaOi1snv1Q=
+github.com/quic-go/quic-go v0.40.1/go.mod h1:PeN7kuVJ4xZbxSv/4OX6S1USOX8MJvydwpTx31vx60c=
+github.com/quic-go/quic-go v0.41.0 h1:aD8MmHfgqTURWNJy48IYFg2OnxwHT3JL7ahGs73lb4k=
+github.com/quic-go/quic-go v0.41.0/go.mod h1:qCkNjqczPEvgsOnxZ0eCD14lv+B2LHlFAB++CNOh9hA=
 github.com/riobard/go-bloom v0.0.0-20200614022211-cdc8013cb5b3 h1:f/FNXud6gA3MNr8meMVVGxhp+QBTqY91tM8HjEuMjGg=
 github.com/riobard/go-bloom v0.0.0-20200614022211-cdc8013cb5b3/go.mod h1:HgjTstvQsPGkxUsCd2KWxErBblirPizecHcpD3ffK+s=
 github.com/ryanuber/go-glob v1.0.0 h1:iQh3xXAumdQ+4Ufa5b25cRpC5TYKlno6hsv6Cb3pkBk=
@@ -103,43 +127,41 @@ github.com/songgao/water v0.0.0-20200317203138-2b4b6d7c09d8/go.mod h1:P5HUIBuIWK
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.6.1 h1:hDPOHmpOpP40lSULcqw7IrRb/u7w6RpDC9399XyoNd0=
 github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
-github.com/templexxx/cpu v0.0.1/go.mod h1:w7Tb+7qgcAlIyX4NhLuDKt78AHA5SzPmq0Wj6HiEnnk=
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@@ -153,21 +175,32 @@ golang.org/x/mod v0.3.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
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@@ -177,17 +210,17 @@ golang.org/x/sync v0.0.0-20200625203802-6e8e738ad208/go.mod h1:RxMgew5VJxzue5/jJ
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@@ -195,6 +228,11 @@ golang.org/x/sys v0.15.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
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@@ -206,17 +244,19 @@ golang.org/x/tools v0.0.0-20190114222345-bf090417da8b/go.mod h1:n7NCudcB/nEzxVGm
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 golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
 golang.org/x/tools v0.0.0-20190524140312-2c0ae7006135/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
-golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.0.0-20200130002326-2f3ba24bd6e7/go.mod h1:TB2adYChydJhpapKDTa4BR/hXlZSLoq2Wpct/0txZ28=
 golang.org/x/tools v0.0.0-20200425043458-8463f397d07c/go.mod h1:EkVYQZoAsY45+roYkvgYkIh4xh/qjgUK9TdY2XT94GE=
 golang.org/x/tools v0.0.0-20200808161706-5bf02b21f123/go.mod h1:njjCfa9FT2d7l9Bc6FUM5FLjQPp3cFF28FI3qnDFljA=
 golang.org/x/tools v0.1.6-0.20210726203631-07bc1bf47fb2/go.mod h1:o0xws9oXOQQZyjljx8fwUC0k7L1pTE6eaCbjGeHmOkk=
+golang.org/x/tools v0.6.0 h1:BOw41kyTf3PuCW1pVQf8+Cyg8pMlkYB1oo9iJ6D/lKM=
+golang.org/x/tools v0.6.0/go.mod h1:Xwgl3UAJ/d3gWutnCtw505GrjyAbvKui8lOU390QaIU=
 golang.org/x/tools v0.9.1 h1:8WMNJAz3zrtPmnYC7ISf5dEn3MT0gY7jBJfw27yrrLo=
 golang.org/x/tools v0.9.1/go.mod h1:owI94Op576fPu3cIGQeHs3joujW/2Oc6MtlxbF5dfNc=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+golang.org/x/tools v0.17.0 h1:FvmRgNOcs3kOa+T20R1uhfP9F6HgG2mfxDv1vrx1Htc=
+golang.org/x/tools v0.17.0/go.mod h1:xsh6VxdV005rRVaS6SSAf9oiAqljS7UZUacMZ8Bnsps=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
 google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
 google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
@@ -232,9 +272,10 @@ google.golang.org/protobuf v1.20.1-0.20200309200217-e05f789c0967/go.mod h1:A+miE
 google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
 google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
 google.golang.org/protobuf v1.28.0 h1:w43yiav+6bVFTBQFZX0r7ipe9JQ1QsbMgHwbBziscLw=
+google.golang.org/protobuf v1.28.0/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-rsc.io/pdf v0.1.1/go.mod h1:n8OzWcQ6Sp37PL01nO98y4iUCRdTGarVfzxY20ICaU4=
diff --git a/gost.go b/gost.go
index 70633d5d..cb4ca47a 100644
--- a/gost.go
+++ b/gost.go
@@ -20,7 +20,7 @@ import (
 )
 
 // Version is the gost version.
-const Version = "2.11.5"
+const Version = "2.12.0"
 
 // Debug is a flag that enables the debug log.
 var Debug bool
@@ -149,9 +149,7 @@ func (rw *readWriter) Write(p []byte) (n int, err error) {
 	return rw.w.Write(p)
 }
 
-var (
-	nopClientConn = &nopConn{}
-)
+var nopClientConn = &nopConn{}
 
 // a nop connection implements net.Conn,
 // it does nothing.
diff --git a/quic.go b/quic.go
index 67b83d35..a12c6f25 100644
--- a/quic.go
+++ b/quic.go
@@ -115,10 +115,10 @@ func (tr *quicTransporter) initSession(addr net.Addr, conn net.PacketConn) (*qui
 		KeepAlivePeriod:      config.KeepAlivePeriod,
 		Versions: []quic.VersionNumber{
 			quic.Version1,
-			quic.VersionDraft29,
+			quic.Version2,
 		},
 	}
-	session, err := quic.DialEarly(conn, addr, addr.String(), tlsConfigQUICALPN(config.TLSConfig), quicConfig)
+	session, err := quic.DialEarly(context.Background(), conn, addr, tlsConfigQUICALPN(config.TLSConfig), quicConfig)
 	if err != nil {
 		log.Logf("quic dial %s: %v", addr, err)
 		return nil, err
@@ -157,7 +157,7 @@ func QUICListener(addr string, config *QUICConfig) (Listener, error) {
 		MaxIdleTimeout:       config.IdleTimeout,
 		Versions: []quic.VersionNumber{
 			quic.Version1,
-			quic.VersionDraft29,
+			quic.Version2,
 		},
 	}
 
@@ -186,7 +186,7 @@ func QUICListener(addr string, config *QUICConfig) (Listener, error) {
 	}
 
 	l := &quicListener{
-		ln:       ln,
+		ln:       *ln,
 		connChan: make(chan net.Conn, 1024),
 		errChan:  make(chan error, 1),
 	}
diff --git a/redirect.go b/redirect.go
index 0ab59d10..199d5c2f 100644
--- a/redirect.go
+++ b/redirect.go
@@ -1,3 +1,4 @@
+//go:build linux
 // +build linux
 
 package gost
diff --git a/redirect_other.go b/redirect_other.go
index d2a576a6..a22fec2c 100644
--- a/redirect_other.go
+++ b/redirect_other.go
@@ -1,3 +1,4 @@
+//go:build !linux
 // +build !linux
 
 package gost
@@ -35,8 +36,7 @@ func (h *tcpRedirectHandler) Handle(c net.Conn) {
 	c.Close()
 }
 
-type udpRedirectHandler struct {
-}
+type udpRedirectHandler struct{}
 
 // UDPRedirectHandler creates a server Handler for UDP transparent server.
 func UDPRedirectHandler(opts ...HandlerOption) Handler {
diff --git a/selector.go b/selector.go
index bff6d11f..ccac77ea 100644
--- a/selector.go
+++ b/selector.go
@@ -4,10 +4,13 @@ import (
 	"errors"
 	"math/rand"
 	"net"
+	"sort"
 	"strconv"
 	"sync"
 	"sync/atomic"
 	"time"
+
+	"github.com/go-log/log"
 )
 
 var (
@@ -205,6 +208,94 @@ func (f *FailFilter) String() string {
 	return "fail"
 }
 
+// FastestFilter filter the fastest node
+type FastestFilter struct {
+	mu sync.Mutex
+
+	pinger        *net.Dialer
+	pingResult    map[int]int
+	pingResultTTL map[int]int64
+
+	topCount int
+}
+
+func NewFastestFilter(pingTimeOut int, topCount int) *FastestFilter {
+	if pingTimeOut == 0 {
+		pingTimeOut = 3000 // 3s
+	}
+	return &FastestFilter{
+		mu:            sync.Mutex{},
+		pinger:        &net.Dialer{Timeout: time.Millisecond * time.Duration(pingTimeOut)},
+		pingResult:    make(map[int]int, 0),
+		pingResultTTL: make(map[int]int64, 0),
+		topCount:      topCount,
+	}
+}
+
+func (f *FastestFilter) Filter(nodes []Node) []Node {
+	// disabled
+	if f.topCount == 0 {
+		return nodes
+	}
+
+	// get latency with ttl cache
+	now := time.Now().Unix()
+
+	var getNodeLatency = func(node Node) int {
+		f.mu.Lock()
+		defer f.mu.Unlock()
+
+		if f.pingResultTTL[node.ID] < now {
+			f.pingResultTTL[node.ID] = now + 5 // tmp
+
+			// get latency
+			go func(node Node) {
+				latency := f.doTcpPing(node.Addr)
+				r := rand.New(rand.NewSource(time.Now().UnixNano()))
+				ttl := 300 - int64(120*r.Float64())
+
+				f.mu.Lock()
+				defer f.mu.Unlock()
+
+				f.pingResult[node.ID] = latency
+				f.pingResultTTL[node.ID] = now + ttl
+			}(node)
+		}
+		return f.pingResult[node.ID]
+	}
+
+	// sort
+	sort.Slice(nodes, func(i, j int) bool {
+		return getNodeLatency(nodes[i]) < getNodeLatency(nodes[j])
+	})
+
+	// split
+	if len(nodes) <= f.topCount {
+		return nodes
+	}
+
+	return nodes[0:f.topCount]
+}
+
+func (f *FastestFilter) String() string {
+	return "fastest"
+}
+
+// doTcpPing
+func (f *FastestFilter) doTcpPing(address string) int {
+	start := time.Now()
+	conn, err := f.pinger.Dial("tcp", address)
+	elapsed := time.Since(start)
+
+	if err == nil {
+		_ = conn.Close()
+	}
+
+	latency := int(elapsed.Milliseconds())
+	log.Logf("pingDoTCP: %s, latency: %d", address, latency)
+	return latency
+}
+
 // InvalidFilter filters the invalid node.
 // A node is invalid if its port is invalid (negative or zero value).
 type InvalidFilter struct{}
diff --git a/selector_test.go b/selector_test.go
index 5da667cf..7cbbfd05 100644
--- a/selector_test.go
+++ b/selector_test.go
@@ -127,6 +127,30 @@ func TestFailFilter(t *testing.T) {
 	}
 }
 
+func TestFastestFilter(t *testing.T) {
+	nodes := []Node{
+		Node{ID: 1, marker: &failMarker{}, Addr: "1.0.0.1:80"},
+		Node{ID: 2, marker: &failMarker{}, Addr: "1.0.0.2:80"},
+		Node{ID: 3, marker: &failMarker{}, Addr: "1.0.0.3:80"},
+	}
+	filter := NewFastestFilter(0, 2)
+
+	var print = func(nodes []Node) []string {
+		var rows []string
+		for _, node := range nodes {
+			rows = append(rows, node.Addr)
+		}
+		return rows
+	}
+
+	result1 := filter.Filter(nodes)
+	t.Logf("result 1: %+v", print(result1))
+
+	time.Sleep(time.Second)
+	result2 := filter.Filter(nodes)
+	t.Logf("result 2: %+v", print(result2))
+}
+
 func TestSelector(t *testing.T) {
 	nodes := []Node{
 		Node{ID: 1, marker: &failMarker{}},
diff --git a/signal.go b/signal.go
index f12e9023..cf7e4840 100644
--- a/signal.go
+++ b/signal.go
@@ -1,3 +1,4 @@
+//go:build windows
 // +build windows
 
 package gost
diff --git a/sockopts_linux.go b/sockopts_linux.go
index 380f272b..7df3f49a 100644
--- a/sockopts_linux.go
+++ b/sockopts_linux.go
@@ -8,4 +8,4 @@ func setSocketMark(fd int, value int) (e error) {
 
 func setSocketInterface(fd int, value string) (e error) {
 	return syscall.SetsockoptString(fd, syscall.SOL_SOCKET, syscall.SO_BINDTODEVICE, value)
-}
\ No newline at end of file
+}
diff --git a/socks.go b/socks.go
index dfd8012a..d59dd89e 100644
--- a/socks.go
+++ b/socks.go
@@ -1125,7 +1125,7 @@ func (h *socks5Handler) handleUDPRelay(conn net.Conn, req *gosocks5.Request) {
 		return
 	}
 
-	relay, err := net.ListenUDP("udp", nil)
+	relay, err := net.ListenUDP("udp", &net.UDPAddr{IP: conn.LocalAddr().(*net.TCPAddr).IP, Port: 0}) // use out-going interface's IP
 	if err != nil {
 		log.Logf("[socks5-udp] %s -> %s : %s", conn.RemoteAddr(), conn.LocalAddr(), err)
 		reply := gosocks5.NewReply(gosocks5.Failure, nil)
@@ -1138,7 +1138,6 @@ func (h *socks5Handler) handleUDPRelay(conn net.Conn, req *gosocks5.Request) {
 	defer relay.Close()
 
 	socksAddr := toSocksAddr(relay.LocalAddr())
-	socksAddr.Host, _, _ = net.SplitHostPort(conn.LocalAddr().String()) // replace the IP to the out-going interface's
 	reply := gosocks5.NewReply(gosocks5.Succeeded, socksAddr)
 	if err := reply.Write(conn); err != nil {
 		log.Logf("[socks5-udp] %s <- %s : %s", conn.RemoteAddr(), conn.LocalAddr(), err)
diff --git a/ssh.go b/ssh.go
index 17ad653f..a78e4c35 100644
--- a/ssh.go
+++ b/ssh.go
@@ -6,8 +6,8 @@ import (
 	"encoding/binary"
 	"errors"
 	"fmt"
-	"os"
 	"net"
+	"os"
 	"strconv"
 	"strings"
 	"sync"
@@ -27,9 +27,7 @@ const (
 	GostSSHTunnelRequest = "gost-tunnel" // extended request type for ssh tunnel
 )
 
-var (
-	errSessionDead = errors.New("session is dead")
-)
+var errSessionDead = errors.New("session is dead")
 
 // ParseSSHKeyFile parses ssh key file.
 func ParseSSHKeyFile(fp string) (ssh.Signer, error) {
@@ -59,8 +57,7 @@ func ParseSSHAuthorizedKeysFile(fp string) (map[string]bool, error) {
 	return authorizedKeysMap, nil
 }
 
-type sshDirectForwardConnector struct {
-}
+type sshDirectForwardConnector struct{}
 
 // SSHDirectForwardConnector creates a Connector for SSH TCP direct port forwarding.
 func SSHDirectForwardConnector() Connector {
@@ -103,8 +100,7 @@ func (c *sshDirectForwardConnector) ConnectContext(ctx context.Context, conn net
 	return conn, nil
 }
 
-type sshRemoteForwardConnector struct {
-}
+type sshRemoteForwardConnector struct{}
 
 // SSHRemoteForwardConnector creates a Connector for SSH TCP remote port forwarding.
 func SSHRemoteForwardConnector() Connector {
@@ -650,7 +646,7 @@ func (h *sshForwardHandler) tcpipForwardRequest(sshConn ssh.Conn, req *ssh.Reque
 		return
 	}
 
-	ln, err := net.Listen("tcp", addr) //tie to the client connection
+	ln, err := net.Listen("tcp", addr) // tie to the client connection
 	if err != nil {
 		log.Log("[ssh-rtcp]", err)
 		req.Reply(false, nil)
diff --git a/tuntap_unix.go b/tuntap_unix.go
index 9a6d17ee..04d6db01 100644
--- a/tuntap_unix.go
+++ b/tuntap_unix.go
@@ -1,3 +1,4 @@
+//go:build !linux && !windows && !darwin
 // +build !linux,!windows,!darwin
 
 package gost