diff --git a/examples/regex_patterns/build_opt.h b/examples/regex_patterns/build_opt.h
new file mode 100644
index 000000000..f59785169
--- /dev/null
+++ b/examples/regex_patterns/build_opt.h
@@ -0,0 +1 @@
+-DASYNCWEBSERVER_REGEX=1
\ No newline at end of file
diff --git a/library.json b/library.json
index 750ca28d2..7947a4d3b 100644
--- a/library.json
+++ b/library.json
@@ -12,7 +12,7 @@
     "type": "git",
     "url": "https://github.com/me-no-dev/ESPAsyncWebServer.git"
   },
-  "version": "1.2.3",
+  "version": "1.2.4",
   "license": "LGPL-3.0",
   "frameworks": "arduino",
   "platforms": ["espressif8266", "espressif32"],
diff --git a/library.properties b/library.properties
index 401b04173..fb650fa21 100644
--- a/library.properties
+++ b/library.properties
@@ -1,5 +1,5 @@
 name=ESP Async WebServer
-version=1.2.3
+version=1.2.4
 author=Me-No-Dev
 maintainer=Me-No-Dev
 sentence=Async Web Server for ESP8266 and ESP31B
diff --git a/src/AsyncEventSource.cpp b/src/AsyncEventSource.cpp
index f2914df54..3b825750e 100644
--- a/src/AsyncEventSource.cpp
+++ b/src/AsyncEventSource.cpp
@@ -19,6 +19,11 @@
 */
 #include "Arduino.h"
 #include "AsyncEventSource.h"
+#ifdef ESP32
+#if ESP_IDF_VERSION_MAJOR >= 5
+#include "rom/ets_sys.h"
+#endif
+#endif
 
 static String generateEventMessage(const char *message, const char *event, uint32_t id, uint32_t reconnect){
   String ev = "";
diff --git a/src/AsyncWebSocket.cpp b/src/AsyncWebSocket.cpp
index f76f2fc96..bdfa19718 100644
--- a/src/AsyncWebSocket.cpp
+++ b/src/AsyncWebSocket.cpp
@@ -28,6 +28,11 @@
 #else
 #include <Hash.h>
 #endif
+#ifdef ESP32
+#if ESP_IDF_VERSION_MAJOR >= 5
+#include "rom/ets_sys.h"
+#endif
+#endif
 
 #define MAX_PRINTF_LEN 64
 
@@ -829,7 +834,7 @@ void AsyncWebSocketClient::binary(AsyncWebSocketMessageBuffer * buffer)
 
 IPAddress AsyncWebSocketClient::remoteIP() {
     if(!_client) {
-        return IPAddress(0U);
+        return IPAddress((uint32_t)0U);
     }
     return _client->remoteIP();
 }
@@ -1259,9 +1264,15 @@ AsyncWebSocketResponse::AsyncWebSocketResponse(const String& key, AsyncWebSocket
   (String&)key += WS_STR_UUID;
   mbedtls_sha1_context ctx;
   mbedtls_sha1_init(&ctx);
+#if ESP_IDF_VERSION_MAJOR < 5
   mbedtls_sha1_starts_ret(&ctx);
   mbedtls_sha1_update_ret(&ctx, (const unsigned char*)key.c_str(), key.length());
   mbedtls_sha1_finish_ret(&ctx, hash);
+#else
+  mbedtls_sha1_starts(&ctx);
+  mbedtls_sha1_update(&ctx, (const unsigned char*)key.c_str(), key.length());
+  mbedtls_sha1_finish(&ctx, hash);
+#endif
   mbedtls_sha1_free(&ctx);
 #endif
   base64_encodestate _state;
diff --git a/src/WebAuthentication.cpp b/src/WebAuthentication.cpp
index 45246a196..38b20f37c 100644
--- a/src/WebAuthentication.cpp
+++ b/src/WebAuthentication.cpp
@@ -71,9 +71,15 @@ static bool getMD5(uint8_t * data, uint16_t len, char * output){//33 bytes or mo
   memset(_buf, 0x00, 16);
 #ifdef ESP32
   mbedtls_md5_init(&_ctx);
+#if ESP_IDF_VERSION_MAJOR < 5
   mbedtls_md5_starts_ret(&_ctx);
   mbedtls_md5_update_ret(&_ctx, data, len);
   mbedtls_md5_finish_ret(&_ctx, _buf);
+#else
+  mbedtls_md5_starts(&_ctx);
+  mbedtls_md5_update(&_ctx, data, len);
+  mbedtls_md5_finish(&_ctx, _buf);
+#endif
 #else
   MD5Init(&_ctx);
   MD5Update(&_ctx, data, len);