diff --git a/examples/esp32/WebSocketClientSSLBundle/WebSocketClientSSLBundle.ino b/examples/esp32/WebSocketClientSSLBundle/WebSocketClientSSLBundle.ino
index b9385a7..f64cc58 100644
--- a/examples/esp32/WebSocketClientSSLBundle/WebSocketClientSSLBundle.ino
+++ b/examples/esp32/WebSocketClientSSLBundle/WebSocketClientSSLBundle.ino
@@ -112,7 +112,13 @@ void setup() {
     // server address, port and URL. This server can be flakey.
     // Expected response: Request served by 0123456789abcdef
     // webSocket.beginSslWithBundle("echo.websocket.org", 443, "/", rootca_crt_bundle_start, "");
+    // ESP32 3.0.4 or higher needs the size of the bundle
+    // webSocket.beginSslWithBundle("echo.websocket.org", 443, "/", rootca_crt_bundle_start, sizeof(rootca_crt_bundle_start), "");
+#if ESP_ARDUINO_VERSION >= ESP_ARDUINO_VERSION_VAL(3, 0, 4)
+    webSocket.beginSslWithBundle("echo.websocket.org", 443, "/", NULL, 0, "");
+#else
     webSocket.beginSslWithBundle("echo.websocket.org", 443, "/", NULL, "");
+#endif
 
     // event handler
     webSocket.onEvent(webSocketEvent);
diff --git a/src/WebSocketsClient.cpp b/src/WebSocketsClient.cpp
index 8578f4b..78512e3 100644
--- a/src/WebSocketsClient.cpp
+++ b/src/WebSocketsClient.cpp
@@ -50,6 +50,9 @@ void WebSocketsClient::begin(const char * host, uint16_t port, const char * url,
     _CA_cert     = NULL;
 #ifdef ESP32
     _CA_bundle = NULL;
+#if ESP_ARDUINO_VERSION >= ESP_ARDUINO_VERSION_VAL(3, 0, 4)
+    _CA_bundle_size = 0;
+#endif
 #endif
 #endif
 
@@ -124,6 +127,17 @@ void WebSocketsClient::beginSslWithCA(const char * host, uint16_t port, const ch
     _CA_cert      = CA_cert;
     _CA_bundle    = NULL;
 }
+
+#if defined(ESP32) && ESP_ARDUINO_VERSION >= ESP_ARDUINO_VERSION_VAL(3, 0, 4)
+void WebSocketsClient::beginSslWithBundle(const char * host, uint16_t port, const char * url, const uint8_t * CA_bundle, size_t CA_bundle_size, const char * protocol) {
+    begin(host, port, url, protocol);
+    _client.isSSL   = true;
+    _fingerprint    = SSL_FINGERPRINT_NULL;
+    _CA_cert        = NULL;
+    _CA_bundle      = CA_bundle;
+    _CA_bundle_size = CA_bundle_size;
+}
+#else
 void WebSocketsClient::beginSslWithBundle(const char * host, uint16_t port, const char * url, const uint8_t * CA_bundle, const char * protocol) {
     begin(host, port, url, protocol);
     _client.isSSL = true;
@@ -131,6 +145,7 @@ void WebSocketsClient::beginSslWithBundle(const char * host, uint16_t port, cons
     _CA_cert      = NULL;
     _CA_bundle    = CA_bundle;
 }
+#endif
 
 #else
 void WebSocketsClient::beginSSL(const char * host, uint16_t port, const char * url, const uint8_t * fingerprint, const char * protocol) {
@@ -247,9 +262,11 @@ void WebSocketsClient::loop(void) {
 #if defined(ESP32)
             } else if(_CA_bundle) {
                 DEBUG_WEBSOCKETS("[WS-Client] setting CA bundle");
+#if ESP_ARDUINO_VERSION >= ESP_ARDUINO_VERSION_VAL(3, 0, 4)
+                _client.ssl->setCACertBundle(_CA_bundle, _CA_bundle_size);
+#else
                 _client.ssl->setCACertBundle(_CA_bundle);
 #endif
-#if defined(ESP32)
             } else if(!SSL_FINGERPRINT_IS_SET) {
                 _client.ssl->setInsecure();
 #elif defined(SSL_BARESSL)
diff --git a/src/WebSocketsClient.h b/src/WebSocketsClient.h
index 081e37e..c2a6b92 100644
--- a/src/WebSocketsClient.h
+++ b/src/WebSocketsClient.h
@@ -54,8 +54,12 @@ class WebSocketsClient : protected WebSockets {
 #endif
     void beginSslWithCA(const char * host, uint16_t port, const char * url = "/", const char * CA_cert = NULL, const char * protocol = "arduino");
 #ifdef ESP32
+#if ESP_ARDUINO_VERSION >= ESP_ARDUINO_VERSION_VAL(3, 0, 4)
+    void beginSslWithBundle(const char * host, uint16_t port, const char * url = "/", const uint8_t * CA_bundle = NULL, size_t CA_bundle_size = 0, const char * protocol = "arduino");
+#else
     void beginSslWithBundle(const char * host, uint16_t port, const char * url = "/", const uint8_t * CA_bundle = NULL, const char * protocol = "arduino");
 #endif
+#endif
 #endif
 
     void beginSocketIO(const char * host, uint16_t port, const char * url = "/socket.io/?EIO=3", const char * protocol = "arduino");
@@ -116,6 +120,11 @@ class WebSocketsClient : protected WebSockets {
     String _fingerprint;
     const char * _CA_cert;
     const uint8_t * _CA_bundle;
+#if defined(ESP32)
+#if ESP_ARDUINO_VERSION >= ESP_ARDUINO_VERSION_VAL(3, 0, 4)
+    size_t _CA_bundle_size;
+#endif
+#endif
 #define SSL_FINGERPRINT_IS_SET (_fingerprint.length())
 #define SSL_FINGERPRINT_NULL ""
 #else