diff --git a/platformio.ini b/platformio.ini
index 987f8b4..fbd4333 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -38,7 +38,7 @@ build_unflags =
     -std=gnu++11
 
 lib_deps =
-    mathieucarbou/ESP Async WebServer @ 2.10.8
+    mathieucarbou/ESPAsyncWebServer @ 3.1.2
     bblanchon/ArduinoJson @ 7.0.4
     https://github.com/bertmelis/espMqttClient.git#v1.7.0
     nrf24/RF24 @ 1.4.8
diff --git a/src/WebApi_webapp.cpp b/src/WebApi_webapp.cpp
index b8b8138..b5335b0 100644
--- a/src/WebApi_webapp.cpp
+++ b/src/WebApi_webapp.cpp
@@ -42,7 +42,7 @@ void WebApiWebappClass::responseBinaryDataWithETagCache(AsyncWebServerRequest *r
     if (eTagMatch) {
         response = request->beginResponse(304);
     } else {
-        response = request->beginResponse_P(200, contentType, content, len);
+        response = request->beginResponse(200, contentType, content, len);
         if (contentEncoding.length() > 0) {
             response->addHeader("Content-Encoding", contentEncoding);
         }