diff --git a/runner/options.go b/runner/options.go
index f636b9d1..31813e4d 100644
--- a/runner/options.go
+++ b/runner/options.go
@@ -871,7 +871,7 @@ func (options *Options) ValidateOptions() error {
 		options.OutputCDN = "true"
 	}
 
-	if !stringsutil.EqualFoldAny(options.Protocol, string(httpxcommon.UNKNOWN), string(httpxcommon.HTTP11)) {
+	if !stringsutil.EqualFoldAny(options.Protocol, string(httpxcommon.UNKNOWN), string(httpxcommon.HTTP11), string(httpxcommon.HTTP2), string(httpxcommon.HTTP3)) {
 		return fmt.Errorf("invalid protocol: %s", options.Protocol)
 	}
 
diff --git a/runner/options_test.go b/runner/options_test.go
new file mode 100644
index 00000000..79165f6e
--- /dev/null
+++ b/runner/options_test.go
@@ -0,0 +1,33 @@
+
+func TestValidateOptions_Protocol(t *testing.T) {
+	tests := []struct {
+		protocol string
+		wantErr  bool
+	}{
+		{"", false},
+		{"unknown", false},
+		{"UNKNOWN", false},
+		{"http11", false},
+		{"HTTP11", false},
+		{"http2", false},
+		{"HTTP2", false},
+		{"http3", false},
+		{"HTTP3", false},
+		{"http10", true},
+		{"invalid", true},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.protocol, func(t *testing.T) {
+			opts := &Options{
+				Protocol: tc.protocol,
+			}
+			err := opts.ValidateOptions()
+			if tc.wantErr {
+				require.Error(t, err)
+			} else {
+				require.NoError(t, err)
+			}
+		})
+	}
+}