diff --git a/client_test.go b/client_test.go
index 9041c7a..19b03b1 100644
--- a/client_test.go
+++ b/client_test.go
@@ -7,6 +7,7 @@ import (
 	"log"
 	"testing"
 
+	"github.com/gammazero/workerpool"
 	"github.com/stretchr/testify/require"
 
 	"github.com/xconnio/xconn-go"
@@ -17,7 +18,9 @@ func connect(t *testing.T) *xconn.Session {
 	defer func() { _ = listener.Close() }()
 	address := fmt.Sprintf("ws://%s/ws", listener.Addr().String())
 
-	client := &xconn.Client{}
+	client := &xconn.Client{
+		SerializerSpec: xconn.JSONSerializerSpec,
+	}
 
 	session, err := client.Connect(context.Background(), address, "realm1")
 	require.NoError(t, err)
@@ -54,11 +57,17 @@ func TestRegisterCall(t *testing.T) {
 	require.NotNil(t, reg)
 
 	t.Run("Call", func(t *testing.T) {
-		result, err := session.Call(context.Background(), "foo.bar", nil, nil, nil)
-		require.NoError(t, err)
-		require.NotNil(t, result)
+		wp := workerpool.New(10)
+		for i := 0; i < 100; i++ {
+			wp.Submit(func() {
+				result, err := session.Call(context.Background(), "foo.bar", nil, nil, nil)
+				require.NoError(t, err)
+				require.NotNil(t, result)
+				require.Equal(t, "hello", result.Args[0])
+			})
+		}
 
-		require.Equal(t, "hello", result.Args[0])
+		wp.StopWait()
 	})
 }
 
diff --git a/go.mod b/go.mod
index a04de23..6e61729 100644
--- a/go.mod
+++ b/go.mod
@@ -4,14 +4,16 @@ go 1.20
 
 require (
 	github.com/gammazero/nexus/v3 v3.2.2
+	github.com/gammazero/workerpool v1.1.3
 	github.com/gobwas/ws v1.4.0
 	github.com/stretchr/testify v1.8.4
-	github.com/xconnio/wampproto-go v0.0.0-20240530132134-a9a2ca11944a
+	github.com/xconnio/wampproto-go v0.0.0-20240530202948-a758eb534226
 )
 
 require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/fxamacker/cbor/v2 v2.6.0 // indirect
+	github.com/gammazero/deque v0.2.0 // indirect
 	github.com/gobwas/httphead v0.1.0 // indirect
 	github.com/gobwas/pool v0.2.1 // indirect
 	github.com/gorilla/websocket v1.5.0 // indirect
diff --git a/go.sum b/go.sum
index 85e1e7d..08a80c3 100644
--- a/go.sum
+++ b/go.sum
@@ -2,8 +2,12 @@ github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/fxamacker/cbor/v2 v2.6.0 h1:sU6J2usfADwWlYDAFhZBQ6TnLFBHxgesMrQfQgk1tWA=
 github.com/fxamacker/cbor/v2 v2.6.0/go.mod h1:pxXPTn3joSm21Gbwsv0w9OSA2y1HFR9qXEeXQVeNoDQ=
+github.com/gammazero/deque v0.2.0 h1:SkieyNB4bg2/uZZLxvya0Pq6diUlwx7m2TeT7GAIWaA=
+github.com/gammazero/deque v0.2.0/go.mod h1:LFroj8x4cMYCukHJDbxFCkT+r9AndaJnFMuZDV34tuU=
 github.com/gammazero/nexus/v3 v3.2.2 h1:uEBe4rKIcbBcbdP6XuyKUhnWBXxT0BnJrecG9+yZSTs=
 github.com/gammazero/nexus/v3 v3.2.2/go.mod h1:55oZwPZFgRFCEjpMj1kdzffiPORKKmRsipSY8BeKRvY=
+github.com/gammazero/workerpool v1.1.3 h1:WixN4xzukFoN0XSeXF6puqEqFTl2mECI9S6W44HWy9Q=
+github.com/gammazero/workerpool v1.1.3/go.mod h1:wPjyBLDbyKnUn2XwwyD3EEwo9dHutia9/fwNmSHWACc=
 github.com/gobwas/httphead v0.1.0 h1:exrUm0f4YX0L7EBwZHuCF4GDp8aJfVeBrlLQrs6NqWU=
 github.com/gobwas/httphead v0.1.0/go.mod h1:O/RXo79gxV8G+RqlR/otEwx4Q36zl9rqC5u12GKvMCM=
 github.com/gobwas/pool v0.2.1 h1:xfeeEhW7pwmX8nuLVlqbzVc7udMDrwetjEv+TZIz1og=
@@ -24,8 +28,8 @@ github.com/vmihailenco/tagparser/v2 v2.0.0 h1:y09buUbR+b5aycVFQs/g70pqKVZNBmxwAh
 github.com/vmihailenco/tagparser/v2 v2.0.0/go.mod h1:Wri+At7QHww0WTrCBeu4J6bNtoV6mEfg5OIWRZA9qds=
 github.com/x448/float16 v0.8.4 h1:qLwI1I70+NjRFUR3zs1JPUCgaCXSh3SW62uAKT1mSBM=
 github.com/x448/float16 v0.8.4/go.mod h1:14CWIYCyZA/cWjXOioeEpHeN/83MdbZDRQHoFcYsOfg=
-github.com/xconnio/wampproto-go v0.0.0-20240530132134-a9a2ca11944a h1:0Vb6+/sNho0zn7kjRsdBvdGylFkz9uZZzeT1RrgKHIU=
-github.com/xconnio/wampproto-go v0.0.0-20240530132134-a9a2ca11944a/go.mod h1:BH0AFRLJ9POvVfxsFd9GyvA15U9o0XYQfq8TdkqO2vQ=
+github.com/xconnio/wampproto-go v0.0.0-20240530202948-a758eb534226 h1:1UFs+1ev6G1qDVgf5tGqnhsm5e9btuon41ogyrR1QD4=
+github.com/xconnio/wampproto-go v0.0.0-20240530202948-a758eb534226/go.mod h1:BH0AFRLJ9POvVfxsFd9GyvA15U9o0XYQfq8TdkqO2vQ=
 go.uber.org/goleak v1.2.1 h1:NBol2c7O1ZokfZ0LEU9K6Whx/KnwvepVetCUhtKja4A=
 golang.org/x/crypto v0.23.0 h1:dIJU/v2J8Mdglj/8rJ6UUOM3Zc9zLZxVZwwxMooUSAI=
 golang.org/x/crypto v0.23.0/go.mod h1:CKFgDieR+mRhux2Lsu27y0fO304Db0wZe70UKqHu0v8=