diff --git a/src/mainwindow.h b/src/mainwindow.h
--- a/src/mainwindow.h
+++ b/src/mainwindow.h
@@ -45,6 +45,7 @@
 #include "snapshotmanager.h"
 #include "plotmanager.h"
 #include "datarecorder.h"
+#include "updatechecker.h"
 
 namespace Ui {
 class MainWindow;
@@ -79,6 +80,7 @@ private:
     PlotManager* plotMan;
     SnapshotManager snapshotMan;
     DataRecorder recorder;       // operated by `recordPanel`
+    UpdateChecker updateChecker;
 
     QLabel spsLabel;
     CommandPanel commandPanel;