diff --git a/go.mod b/go.mod
index ac846d6..246b620 100644
--- a/go.mod
+++ b/go.mod
@@ -6,7 +6,7 @@ require (
 	github.com/fsnotify/fsnotify v1.6.0
 	github.com/sagernet/go-tun2socks v1.16.12-0.20220818015926-16cb67876a61
 	github.com/sagernet/netlink v0.0.0-20220905062125-8043b4a9aa97
-	github.com/sagernet/sing v0.2.4-0.20230418025125-f196b4303e31
+	github.com/sagernet/sing v0.2.4-0.20230419153323-5fae6fa434c1
 	golang.org/x/net v0.8.0
 	golang.org/x/sys v0.7.0
 	gvisor.dev/gvisor v0.0.0-20220901235040-6ca97ef2ce1c
diff --git a/go.sum b/go.sum
index 19e759e..eea2e88 100644
--- a/go.sum
+++ b/go.sum
@@ -7,8 +7,8 @@ github.com/sagernet/go-tun2socks v1.16.12-0.20220818015926-16cb67876a61/go.mod h
 github.com/sagernet/netlink v0.0.0-20220905062125-8043b4a9aa97 h1:iL5gZI3uFp0X6EslacyapiRz7LLSJyr4RajF/BhMVyE=
 github.com/sagernet/netlink v0.0.0-20220905062125-8043b4a9aa97/go.mod h1:xLnfdiJbSp8rNqYEdIW/6eDO4mVoogml14Bh2hSiFpM=
 github.com/sagernet/sing v0.0.0-20220817130738-ce854cda8522/go.mod h1:QVsS5L/ZA2Q5UhQwLrn0Trw+msNd/NPGEhBKR/ioWiY=
-github.com/sagernet/sing v0.2.4-0.20230418025125-f196b4303e31 h1:qgq8jeY/rbnY9NwYXByO//AP0ByIxnsKUxQx1tOB3W0=
-github.com/sagernet/sing v0.2.4-0.20230418025125-f196b4303e31/go.mod h1:Ta8nHnDLAwqySzKhGoKk4ZIB+vJ3GTKj7UPrWYvM+4w=
+github.com/sagernet/sing v0.2.4-0.20230419153323-5fae6fa434c1 h1:CdzNL25lzfVo0NMeghPqsupNsWvkzrbrUt5t8DoDPcQ=
+github.com/sagernet/sing v0.2.4-0.20230419153323-5fae6fa434c1/go.mod h1:Ta8nHnDLAwqySzKhGoKk4ZIB+vJ3GTKj7UPrWYvM+4w=
 github.com/vishvananda/netns v0.0.0-20211101163701-50045581ed74 h1:gga7acRE695APm9hlsSMoOoE65U4/TcqNj90mc69Rlg=
 github.com/vishvananda/netns v0.0.0-20211101163701-50045581ed74/go.mod h1:DD4vA1DwXk04H54A1oHXtwZmA0grkVMdPxx/VGLCah0=
 golang.org/x/net v0.8.0 h1:Zrh2ngAOFYneWTAIAPethzeaQLuHwhuBkuV6ZiRnUaQ=
diff --git a/gvisor.go b/gvisor.go
index 9e42a7c..b525509 100644
--- a/gvisor.go
+++ b/gvisor.go
@@ -68,7 +68,7 @@ func NewGVisor(
 		logger:                 options.Logger,
 	}
 	if gStack.router != nil {
-		gStack.routeMapping = NewRouteMapping(options.Context, options.UDPTimeout)
+		gStack.routeMapping = NewRouteMapping(options.UDPTimeout)
 	}
 	return gStack, nil
 }
diff --git a/gvisor_udp.go b/gvisor_udp.go
index 38a24a4..e62157d 100644
--- a/gvisor_udp.go
+++ b/gvisor_udp.go
@@ -29,7 +29,7 @@ func NewUDPForwarder(ctx context.Context, stack *stack.Stack, handler Handler, u
 	return &UDPForwarder{
 		ctx:    ctx,
 		stack:  stack,
-		udpNat: udpnat.New[netip.AddrPort](ctx, udpTimeout, handler),
+		udpNat: udpnat.New[netip.AddrPort](udpTimeout, handler),
 	}
 }
 
diff --git a/route_mapping.go b/route_mapping.go
index be89853..b0ccad8 100644
--- a/route_mapping.go
+++ b/route_mapping.go
@@ -1,8 +1,6 @@
 package tun
 
 import (
-	"context"
-
 	"github.com/sagernet/sing/common"
 	"github.com/sagernet/sing/common/cache"
 )
@@ -11,10 +9,9 @@ type RouteMapping struct {
 	status *cache.LruCache[RouteSession, RouteAction]
 }
 
-func NewRouteMapping(ctx context.Context, maxAge int64) *RouteMapping {
+func NewRouteMapping(maxAge int64) *RouteMapping {
 	return &RouteMapping{
 		status: cache.New(
-			cache.WithContext[RouteSession, RouteAction](ctx),
 			cache.WithAge[RouteSession, RouteAction](maxAge),
 			cache.WithUpdateAgeOnGet[RouteSession, RouteAction](),
 			cache.WithEvict[RouteSession, RouteAction](func(key RouteSession, conn RouteAction) {
diff --git a/system.go b/system.go
index 9705d07..ee59908 100644
--- a/system.go
+++ b/system.go
@@ -65,7 +65,7 @@ func NewSystem(options StackOptions) (Stack, error) {
 		underPlatform: options.UnderPlatform,
 	}
 	if stack.router != nil {
-		stack.routeMapping = NewRouteMapping(options.Context, options.UDPTimeout)
+		stack.routeMapping = NewRouteMapping(options.UDPTimeout)
 	}
 	if len(options.Inet4Address) > 0 {
 		if options.Inet4Address[0].Bits() == 32 {
@@ -118,7 +118,7 @@ func (s *System) Start() error {
 		go s.acceptLoop(tcpListener)
 	}
 	s.tcpNat = NewNat(s.ctx, time.Second*time.Duration(s.udpTimeout))
-	s.udpNat = udpnat.New[netip.AddrPort](s.ctx, s.udpTimeout, s.handler)
+	s.udpNat = udpnat.New[netip.AddrPort](s.udpTimeout, s.handler)
 	go s.tunLoop()
 	return nil
 }