diff --git a/include/WebApi_ws_vedirect_live.h b/include/WebApi_ws_vedirect_live.h
index 36f80c8b..f85f332a 100644
--- a/include/WebApi_ws_vedirect_live.h
+++ b/include/WebApi_ws_vedirect_live.h
@@ -21,6 +21,6 @@ private:
 
     uint32_t _lastWsPublish = 0;
     uint32_t _lastVedirectUpdateCheck = 0;
-    unsigned long _lastWsCleanup = 0;
+    uint32_t _lastWsCleanup = 0;
     uint32_t _newestVedirectTimestamp = 0;
 };
\ No newline at end of file
diff --git a/src/WebApi_vedirect.cpp b/src/WebApi_vedirect.cpp
index c7dd3a87..a283f3d9 100644
--- a/src/WebApi_vedirect.cpp
+++ b/src/WebApi_vedirect.cpp
@@ -11,7 +11,7 @@
 
 void WebApiVedirectClass::init(AsyncWebServer* server)
 {
-    using namespace std::placeholders;
+    using std::placeholders::_1;
 
     _server = server;
 
diff --git a/src/WebApi_ws_vedirect_live.cpp b/src/WebApi_ws_vedirect_live.cpp
index 1f0b9f7d..3ecf31ee 100644
--- a/src/WebApi_ws_vedirect_live.cpp
+++ b/src/WebApi_ws_vedirect_live.cpp
@@ -13,7 +13,12 @@ WebApiWsVedirectLiveClass::WebApiWsVedirectLiveClass()
 
 void WebApiWsVedirectLiveClass::init(AsyncWebServer* server)
 {
-    using namespace std::placeholders;
+    using std::placeholders::_1;
+    using std::placeholders::_2;
+    using std::placeholders::_3;
+    using std::placeholders::_4;
+    using std::placeholders::_5;
+    using std::placeholders::_6;
 
     _server = server;
     _server->on("/api/vedirectlivedata/status", HTTP_GET, std::bind(&WebApiWsVedirectLiveClass::onLivedataStatus, this, _1));
@@ -109,11 +114,11 @@ void WebApiWsVedirectLiveClass::onWebsocketEvent(AsyncWebSocket* server, AsyncWe
 {
     if (type == WS_EVT_CONNECT) {
         char str[64];
-        sprintf(str, "Websocket: [%s][%u] connect", server->url(), client->id());
+        snprintf(str, sizeof(str), "Websocket: [%s][%u] connect", server->url(), client->id());
         Serial.println(str);
     } else if (type == WS_EVT_DISCONNECT) {
         char str[64];
-        sprintf(str, "Websocket: [%s][%u] disconnect", server->url(), client->id());
+        snprintf(str, sizeof(str), "Websocket: [%s][%u] disconnect", server->url(), client->id());
         Serial.println(str);
     }
 }