diff --git a/README.md b/README.md
index 052b96b..cc949ae 100644
--- a/README.md
+++ b/README.md
@@ -94,7 +94,7 @@ Flags:
   -m, --method string            request method (default "GET")
       --mtls-cert string         mTLS cert path
       --mtls-key string          mTLS cert private key path
-      --parallel                 Sends reqs in parallel per connection with HTTP/2
+      --parallel                 Sends reqs in parallel per connection with HTTP/2 or HTTP/3
       --read-timeout duration    Read timeout (default 5s)
   -r, --requests int             Number of requests
       --skip-verify              Skip verify SSL cert signer
diff --git a/cmd/payloader/run.go b/cmd/payloader/run.go
index 812b12d..097bc99 100644
--- a/cmd/payloader/run.go
+++ b/cmd/payloader/run.go
@@ -109,7 +109,7 @@ func init() {
 	runCmd.Flags().Int64VarP(&reqs, argRequests, "r", 0, "Number of requests")
 	runCmd.Flags().UintVarP(&conns, argConnections, "c", 1, "Number of simultaneous connections")
 	runCmd.Flags().BoolVarP(&disableKeepAlive, argKeepAlive, "k", false, "Disable keep-alive connections")
-	runCmd.Flags().BoolVar(&parallel, argParallel, false, "Sends reqs in parallel per connection with HTTP/2")
+	runCmd.Flags().BoolVar(&parallel, argParallel, false, "Sends reqs in parallel per connection with HTTP/2 or HTTP/3")
 
 	runCmd.Flags().BoolVar(&skipVerify, argVerifySigner, false, "Skip verify SSL cert signer")
 	runCmd.Flags().DurationVarP(&duration, argTime, "t", 0, "Execution time window, if used with -r will uniformly distribute reqs within time window, without -r reqs are unlimited")
diff --git a/config/config.go b/config/config.go
index da73b94..7a36cf3 100644
--- a/config/config.go
+++ b/config/config.go
@@ -14,34 +14,34 @@ import (
 )
 
 type Config struct {
-	Ctx                  context.Context
-	ReqURI               string
-	DisableKeepAlive     bool
-	ReqTarget            int64
-	Conns                uint
-	Duration             time.Duration
-	MTLSKey              string
-	MTLSCert             string
-	SkipVerify           bool
-	ReadTimeout          time.Duration
-	WriteTimeout         time.Duration
-	Method               string
-	Verbose              bool
-	VerboseTicker        time.Duration
-	JwtKID               string
-	JwtKey               string
-	JwtSub               string
-	JwtCustomClaimsJSON  string
-	JwtIss               string
-	JwtAud               string
-	JwtHeader            string
-	JwtsFilename         string
-	SendJWT              bool
-	Headers              []string
-	Body                 string
-	BodyFile             string
-	Client               string
-	Parallel             bool
+	Ctx                 context.Context
+	ReqURI              string
+	DisableKeepAlive    bool
+	ReqTarget           int64
+	Conns               uint
+	Duration            time.Duration
+	MTLSKey             string
+	MTLSCert            string
+	SkipVerify          bool
+	ReadTimeout         time.Duration
+	WriteTimeout        time.Duration
+	Method              string
+	Verbose             bool
+	VerboseTicker       time.Duration
+	JwtKID              string
+	JwtKey              string
+	JwtSub              string
+	JwtCustomClaimsJSON string
+	JwtIss              string
+	JwtAud              string
+	JwtHeader           string
+	JwtsFilename        string
+	SendJWT             bool
+	Headers             []string
+	Body                string
+	BodyFile            string
+	Client              string
+	Parallel            bool
 }
 
 func NewConfig(ctx context.Context, reqURI, mTLScert, mTLSKey string, disableKeepAlive bool, reqs int64, conns uint, totalTime time.Duration, skipVerify bool, readTimeout, writeTimeout time.Duration, method string, verbose bool, ticker time.Duration, jwtKID, jwtKey, jwtSub, jwtCustomClaimsJSON, jwtIss, jwtAud, jwtHeader, jwtsFilename string, headers []string, body, bodyFile string, client string, parallel bool) *Config {
@@ -145,7 +145,7 @@ func (c *Config) Validate() error {
 	}
 
 	// Require JwtHeader if JwtKey or JwtsFilename is present
-  if (c.JwtsFilename != "" || c.JwtKey != "") && c.JwtHeader == "" {
+	if (c.JwtsFilename != "" || c.JwtKey != "") && c.JwtHeader == "" {
 		return errors.New("config: empty jwt header")
 	}
 
@@ -200,8 +200,8 @@ func (c *Config) Validate() error {
 		}
 	}
 
-	if c.Parallel && c.Client != worker.HttpClientNetHTTP2 {
-		return fmt.Errorf("can only run parallel with %s client", worker.HttpClientNetHTTP2)
+	if c.Parallel && (c.Client != worker.HttpClientNetHTTP2 && c.Client != worker.HttpClientNetHTTP3) {
+		return fmt.Errorf("can only run parallel with %s or %s client", worker.HttpClientNetHTTP2, worker.HttpClientNetHTTP3)
 	}
 
 	if c.VerboseTicker == 0 {
diff --git a/pkgs/payloader/payloader_test.go b/pkgs/payloader/payloader_test.go
index fd44376..7acebd4 100644
--- a/pkgs/payloader/payloader_test.go
+++ b/pkgs/payloader/payloader_test.go
@@ -217,13 +217,13 @@ func testPayLoader_Run(t *testing.T, addr, client string, cleanup func()) {
 			}},
 		},
 		{
-			name: "PUT 10 connections for 10 second long test with 100 requests",
+			name: "PUT 10 connections for 5 second long test with 100 requests",
 			fields: fields{config: &config.Config{
 				Ctx:           context.Background(),
 				ReqURI:        addr,
 				Conns:         10,
 				ReqTarget:     100,
-				Duration:      10 * time.Second,
+				Duration:      5 * time.Second,
 				ReadTimeout:   5 * time.Second,
 				WriteTimeout:  5 * time.Second,
 				Method:        "PUT",
@@ -432,7 +432,7 @@ func testPayLoader_Run(t *testing.T, addr, client string, cleanup func()) {
 		},
 	}
 
-	if client == "nethttp2" {
+	if client == "nethttp2" || client == "nethttp3" {
 		tests = append(tests, tcase{
 			name: "PARALLEL - GET 10 connections for 210 requests",
 			fields: fields{config: &config.Config{
@@ -464,6 +464,7 @@ func testPayLoader_Run(t *testing.T, addr, client string, cleanup func()) {
 	}
 
 	for _, tt := range tests {
+		tt := tt
 		t.Run(tt.name, func(t *testing.T) {
 			p := NewPayLoader(tt.fields.config)
 			got, err := p.Run()