diff --git a/README.md b/README.md
index fdc4e4c..b5930eb 100644
--- a/README.md
+++ b/README.md
@@ -32,6 +32,7 @@ a WebSocket Server and Client for Arduino based on RFC6455.
  - ATmega328 with enc28j60 (ATmega branch)
  - ATmega2560 with Ethernet Shield (ATmega branch)
  - ATmega2560 with enc28j60 (ATmega branch)
+ - Arduino UNO [R4 WiFi](https://github.com/arduino/ArduinoCore-renesas)
 
 ###### Note: ######
 
diff --git a/examples/arduino_renesas/arduino_uno_r4_wifi/arduino_uno_r4_wifi.ino b/examples/arduino_renesas/arduino_uno_r4_wifi/arduino_uno_r4_wifi.ino
new file mode 100644
index 0000000..2168a62
--- /dev/null
+++ b/examples/arduino_renesas/arduino_uno_r4_wifi/arduino_uno_r4_wifi.ino
@@ -0,0 +1,109 @@
+#include <Arduino.h>
+#include <stdarg.h>
+#include <stdio.h>
+
+#include "WiFiS3.h"
+#include <WebSocketsClient.h>
+
+#define WIFI_SSID ""
+#define WIFI_PASS ""
+
+WebSocketsClient webSocket;
+ 
+void webSocketEvent(WStype_t type, uint8_t *payload, size_t length) {
+
+  switch (type) {
+    case WStype_DISCONNECTED:
+      Serial.println("[WSc] Disconnected!");
+      break;
+    case WStype_CONNECTED:
+      Serial.println("[WSc] Connected!");
+
+      // send message to server when Connected
+      webSocket.sendTXT("Connected");
+      break;
+    case WStype_TEXT:
+      Serial.print("[WSc] get text:");
+      Serial.println((char *)payload);
+
+      // send message to server
+      // webSocket.sendTXT("message here");
+      break;
+    case WStype_BIN:
+      // send data to server
+      // webSocket.sendBIN(payload, length);
+      break;
+    case WStype_ERROR:
+    case WStype_FRAGMENT_TEXT_START:
+    case WStype_FRAGMENT_BIN_START:
+    case WStype_FRAGMENT:
+    case WStype_FRAGMENT_FIN:
+      break;
+  }
+}
+
+void setup() {
+  Serial.begin(115200);
+
+  while (!Serial) {
+    ;  // wait for serial port to connect. Needed for native USB port only
+  }
+
+  Serial.println();
+  Serial.println();
+  Serial.println();
+
+  for (uint8_t t = 4; t > 0; t--) {
+    Serial.println("[SETUP] BOOT WAIT ...");
+    Serial.flush();
+    delay(1000);
+  }
+
+  // check for the WiFi module:
+  if (WiFi.status() == WL_NO_MODULE) {
+    Serial.println("Communication with WiFi module failed!");
+    // don't continue
+    while (true)
+      ;
+  }
+
+  String fv = WiFi.firmwareVersion();
+  if (fv < WIFI_FIRMWARE_LATEST_VERSION) {
+    Serial.println("Please upgrade the firmware");
+  }
+
+  Serial.println("[Wifi]: Connecting");
+
+  int status = WL_IDLE_STATUS;
+
+  // attempt to connect to WiFi network:
+  while (status != WL_CONNECTED) {
+    Serial.print("[Wifi]: Attempting to connect to SSID: ");
+    Serial.println(WIFI_SSID);
+
+    // Connect to WPA/WPA2 network. Change this line if using open or WEP network:
+    status = WiFi.begin(WIFI_SSID, WIFI_PASS);
+
+    delay(1000);
+  }
+
+  Serial.println("Connected!");
+
+  // print your board's IP address:
+  IPAddress ip = WiFi.localIP();
+  Serial.print("IP Address: ");
+  Serial.println(ip);
+
+  // server address, port and URL
+  webSocket.begin("192.168.0.123", 8011);
+
+  // event handler
+  webSocket.onEvent(webSocketEvent);
+
+  // try ever 5000 again if connection has failed
+  webSocket.setReconnectInterval(5000);
+}
+
+void loop() {
+  webSocket.loop();
+}
\ No newline at end of file
diff --git a/library.json b/library.json
index 2a5ed65..d51149f 100644
--- a/library.json
+++ b/library.json
@@ -16,10 +16,10 @@
     "keywords": "wifi, http, web, server, client, websocket",
     "license": "LGPL-2.1",
     "name": "WebSockets",
-    "platforms": "atmelavr, espressif8266, espressif32, raspberrypi",
+    "platforms": "atmelavr, espressif8266, espressif32, raspberrypi, renesas_uno",
     "repository": {
         "type": "git",
         "url": "https://github.com/Links2004/arduinoWebSockets.git"
     },
-    "version": "2.4.2"
-}
\ No newline at end of file
+    "version": "2.5.1"
+}
diff --git a/library.properties b/library.properties
index 487596c..462efc5 100644
--- a/library.properties
+++ b/library.properties
@@ -1,5 +1,5 @@
 name=WebSockets
-version=2.4.2
+version=2.5.1
 author=Markus Sattler
 maintainer=Markus Sattler
 sentence=WebSockets for Arduino (Server + Client)
diff --git a/src/WebSockets.h b/src/WebSockets.h
index db6c0e8..56b4988 100644
--- a/src/WebSockets.h
+++ b/src/WebSockets.h
@@ -93,6 +93,12 @@
 #define WEBSOCKETS_YIELD() yield()
 #define WEBSOCKETS_YIELD_MORE() delay(1)
 
+#elif defined(ARDUINO_UNOWIFIR4)
+
+#define WEBSOCKETS_MAX_DATA_SIZE (15 * 1024)
+#define WEBSOCKETS_YIELD() yield()
+#define WEBSOCKETS_YIELD_MORE() delay(1)
+
 #else
 
 // atmega328p has only 2KB ram!
@@ -114,6 +120,7 @@
 #define NETWORK_ESP32 (4)
 #define NETWORK_ESP32_ETH (5)
 #define NETWORK_RP2040 (6)
+#define NETWORK_UNOWIFIR4 (7)
 
 // max size of the WS Message Header
 #define WEBSOCKETS_MAX_HEADER_SIZE (14)
@@ -132,6 +139,9 @@
 #elif defined(ARDUINO_ARCH_RP2040)
 #define WEBSOCKETS_NETWORK_TYPE NETWORK_RP2040
 
+#elif defined(ARDUINO_UNOWIFIR4)
+#define WEBSOCKETS_NETWORK_TYPE NETWORK_UNOWIFIR4
+
 #else
 #define WEBSOCKETS_NETWORK_TYPE NETWORK_W5100
 
@@ -224,6 +234,13 @@
 #define WEBSOCKETS_NETWORK_SSL_CLASS WiFiClientSecure
 #define WEBSOCKETS_NETWORK_SERVER_CLASS WiFiServer
 
+#elif(WEBSOCKETS_NETWORK_TYPE == NETWORK_UNOWIFIR4)
+
+#include <WiFiS3.h>
+
+#define WEBSOCKETS_NETWORK_CLASS WiFiClient
+#define WEBSOCKETS_NETWORK_SERVER_CLASS WiFiServer
+
 #else
 #error "no network type selected!"
 #endif
diff --git a/src/WebSocketsVersion.h b/src/WebSocketsVersion.h
index 11fc8b1..9c69078 100644
--- a/src/WebSocketsVersion.h
+++ b/src/WebSocketsVersion.h
@@ -25,12 +25,12 @@
 #ifndef WEBSOCKETSVERSION_H_
 #define WEBSOCKETSVERSION_H_
 
-#define WEBSOCKETS_VERSION "2.4.2"
+#define WEBSOCKETS_VERSION "2.5.1"
 
 #define WEBSOCKETS_VERSION_MAJOR 2
-#define WEBSOCKETS_VERSION_MINOR 4
-#define WEBSOCKETS_VERSION_PATCH 2
+#define WEBSOCKETS_VERSION_MINOR 5
+#define WEBSOCKETS_VERSION_PATCH 1
 
-#define WEBSOCKETS_VERSION_INT 2004002
+#define WEBSOCKETS_VERSION_INT 2005001
 
 #endif /* WEBSOCKETSVERSION_H_ */