diff --git a/src/CoreParser.php b/src/CoreParser.php
index c7f1759..42980b7 100644
--- a/src/CoreParser.php
+++ b/src/CoreParser.php
@@ -347,7 +347,7 @@ class CoreParser {
      * @param string $payload 
      * @return AppStartResponse 
      */
-    public static function parseAppStart(string $payload): AppStartResponse {    
+    protected static function parseAppStart(string $payload): AppStartResponse {    
         $m = new AppStartResponse();
         
         $m->code = ord($payload[0]);
@@ -368,7 +368,7 @@ class CoreParser {
      * @param string $payload 
      * @return AdvertPathResponse 
      */
-    public static function parseAdvertPathResponse(string $payload): AdvertPathResponse {
+    protected static function parseAdvertPathResponse(string $payload): AdvertPathResponse {
         $m = new AdvertPathResponse();
 
         $m->code = ord($payload[0]);
@@ -384,7 +384,7 @@ class CoreParser {
      * @param string $payload 
      * @return CodeStatusTypeCoreResponse|CodeStatusTypeRadioResponse|CodeStatusTypePacketResponse 
      */
-    public static function parseCodeStatusResponse(string $payload): CodeStatusTypeCoreResponse|CodeStatusTypeRadioResponse|CodeStatusTypePacketResponse {
+    protected static function parseCodeStatusResponse(string $payload): CodeStatusTypeCoreResponse|CodeStatusTypeRadioResponse|CodeStatusTypePacketResponse {
         $m = null;
 
         switch(ord($payload[1])) {
@@ -426,7 +426,7 @@ class CoreParser {
      * @param string $payload 
      * @return DeviceInfoResponse 
      */
-    public static function parseDeviceInfoResponse(string $payload): DeviceInfoResponse {
+    protected static function parseDeviceInfoResponse(string $payload): DeviceInfoResponse {
         $m = new DeviceInfoResponse();
         $m->code = ord($payload[0]);
         $m->firmware_version = ord($payload[1]);
@@ -447,7 +447,7 @@ class CoreParser {
      * @param string $payload 
      * @return ChannelResponse 
      */
-    public static function parseChannelInfoResponse(string $payload): ChannelResponse {
+    protected static function parseChannelInfoResponse(string $payload): ChannelResponse {
         $m = new ChannelResponse();
 
         $m->code = ord($payload[0]);