diff --git a/go.mod b/go.mod
index fceb9e2..6f70751 100644
--- a/go.mod
+++ b/go.mod
@@ -8,7 +8,7 @@ require (
 	github.com/gobwas/httphead v0.1.0
 	github.com/gobwas/ws v1.2.0
 	github.com/mailru/easyjson v0.7.7
-	github.com/puzpuzpuz/xsync/v2 v2.5.1
+	github.com/puzpuzpuz/xsync/v3 v3.0.2
 	github.com/tidwall/gjson v1.14.4
 	github.com/tyler-smith/go-bip32 v1.0.0
 	github.com/tyler-smith/go-bip39 v1.1.0
diff --git a/go.sum b/go.sum
index d2189f5..e2587e2 100644
--- a/go.sum
+++ b/go.sum
@@ -79,8 +79,8 @@ github.com/onsi/gomega v1.7.1/go.mod h1:XdKZgCCFLUoM/7CFJVPcG8C1xQ1AJ0vpAezJrB7J
 github.com/onsi/gomega v1.10.1/go.mod h1:iN09h71vgCQne3DLsj+A5owkum+a2tYe+TOCB1ybHNo=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
-github.com/puzpuzpuz/xsync/v2 v2.5.1 h1:mVGYAvzDSu52+zaGyNjC+24Xw2bQi3kTr4QJ6N9pIIU=
-github.com/puzpuzpuz/xsync/v2 v2.5.1/go.mod h1:gD2H2krq/w52MfPLE+Uy64TzJDVY7lP2znR9qmR35kU=
+github.com/puzpuzpuz/xsync/v3 v3.0.2 h1:3yESHrRFYr6xzkz61LLkvNiPFXxJEAABanTQpKbAaew=
+github.com/puzpuzpuz/xsync/v3 v3.0.2/go.mod h1:VjzYrABPabuM4KyBh1Ftq6u8nhwY5tBPKP9jpmh0nnA=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
 github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpEOglKo=
diff --git a/pool.go b/pool.go
index f690de0..e2825fb 100644
--- a/pool.go
+++ b/pool.go
@@ -8,7 +8,7 @@ import (
 	"sync"
 	"time"
 
-	"github.com/puzpuzpuz/xsync/v2"
+	"github.com/puzpuzpuz/xsync/v3"
 )
 
 const (
@@ -37,7 +37,7 @@ func NewSimplePool(ctx context.Context, opts ...PoolOption) *SimplePool {
 	ctx, cancel := context.WithCancel(ctx)
 
 	pool := &SimplePool{
-		Relays: xsync.NewMapOf[*Relay](),
+		Relays: xsync.NewMapOf[string, *Relay](),
 
 		Context: ctx,
 		cancel:  cancel,
@@ -100,7 +100,7 @@ func (pool *SimplePool) subMany(ctx context.Context, urls []string, filters Filt
 	ctx, cancel := context.WithCancel(ctx)
 	_ = cancel // do this so `go vet` will stop complaining
 	events := make(chan IncomingEvent)
-	seenAlready := xsync.NewMapOf[Timestamp]()
+	seenAlready := xsync.NewMapOf[string, Timestamp]()
 	ticker := time.NewTicker(seenAlreadyDropTick)
 
 	eose := false
@@ -222,7 +222,7 @@ func (pool *SimplePool) subManyEose(ctx context.Context, urls []string, filters
 	ctx, cancel := context.WithCancel(ctx)
 
 	events := make(chan IncomingEvent)
-	seenAlready := xsync.NewMapOf[bool]()
+	seenAlready := xsync.NewMapOf[string, bool]()
 	wg := sync.WaitGroup{}
 	wg.Add(len(urls))
 
diff --git a/relay.go b/relay.go
index f65f423..5ce9757 100644
--- a/relay.go
+++ b/relay.go
@@ -12,7 +12,7 @@ import (
 
 	"github.com/gobwas/ws"
 	"github.com/gobwas/ws/wsutil"
-	"github.com/puzpuzpuz/xsync/v2"
+	"github.com/puzpuzpuz/xsync/v3"
 )
 
 type Status int
@@ -55,8 +55,8 @@ func NewRelay(ctx context.Context, url string, opts ...RelayOption) *Relay {
 		URL:                           NormalizeURL(url),
 		connectionContext:             ctx,
 		connectionContextCancel:       cancel,
-		Subscriptions:                 xsync.NewMapOf[*Subscription](),
-		okCallbacks:                   xsync.NewMapOf[func(bool, string)](),
+		Subscriptions:                 xsync.NewMapOf[string, *Subscription](),
+		okCallbacks:                   xsync.NewMapOf[string, func(bool, string)](),
 		writeQueue:                    make(chan writeRequest),
 		subscriptionChannelCloseQueue: make(chan *Subscription),
 	}