diff --git a/src/updatecheckdialog.cpp b/src/updatecheckdialog.cpp
deleted file mode 100644
--- a/src/updatecheckdialog.cpp
+++ /dev/null
@@ -1,105 +0,0 @@
-/*
-  Copyright © 2017 Hasan Yavuz Özderya
-
-  This file is part of serialplot.
-
-  serialplot is free software: you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation, either version 3 of the License, or
-  (at your option) any later version.
-
-  serialplot is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with serialplot.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-#include "setting_defines.h"
-#include "updatecheckdialog.h"
-#include "ui_updatecheckdialog.h"
-
-UpdateCheckDialog::UpdateCheckDialog(QWidget *parent) :
-    QDialog(parent),
-    ui(new Ui::UpdateCheckDialog)
-{
-    ui->setupUi(this);
-
-    // by default start from yesterday, so that we check at first run
-    lastCheck = QDate::currentDate().addDays(-1);
-
-    connect(&updateChecker, &UpdateChecker::checkFailed,
-            [this](QString errorMessage)
-            {
-                lastCheck = QDate::currentDate();
-                ui->label->setText(QString("Update check failed.\n") + errorMessage);
-            });
-
-    connect(&updateChecker, &UpdateChecker::checkFinished,
-            [this](bool found, QString newVersion, QString downloadUrl)
-            {
-                QString text;
-                if (!found)
-                {
-                    text = "There is no update yet.";
-                }
-                else
-                {
-                    show();
-#ifdef UPDATE_TYPE_PKGMAN
-                    text = QString("There is a new version: %1. "
-                                   "Use your package manager to update"
-                                   " or click to <a href=\"%2\">download</a>.")\
-                        .arg(newVersion).arg(downloadUrl);
-#else
-                    text = QString("Found update to version %1. Click to <a href=\"%2\">download</a>.")\
-                        .arg(newVersion).arg(downloadUrl);
-#endif
-                }
-
-                lastCheck = QDate::currentDate();
-                ui->label->setText(text);
-            });
-}
-
-UpdateCheckDialog::~UpdateCheckDialog()
-{
-    delete ui;
-}
-
-void UpdateCheckDialog::showEvent(QShowEvent *event)
-{
-    updateChecker.checkUpdate();
-    ui->label->setText("Checking update...");
-}
-
-void UpdateCheckDialog::closeEvent(QShowEvent *event)
-{
-    if (updateChecker.isChecking()) updateChecker.cancelCheck();
-}
-
-void UpdateCheckDialog::saveSettings(QSettings* settings)
-{
-    settings->beginGroup(SettingGroup_UpdateCheck);
-    settings->setValue(SG_UpdateCheck_Periodic, ui->cbPeriodic->isChecked());
-    settings->setValue(SG_UpdateCheck_LastCheck, lastCheck.toString(Qt::ISODate));
-    settings->endGroup();
-}
-
-void UpdateCheckDialog::loadSettings(QSettings* settings)
-{
-    settings->beginGroup(SettingGroup_UpdateCheck);
-    ui->cbPeriodic->setChecked(settings->value(SG_UpdateCheck_Periodic,
-                                               ui->cbPeriodic->isChecked()).toBool());
-    auto lastCheckS = settings->value(SG_UpdateCheck_LastCheck, lastCheck.toString(Qt::ISODate)).toString();
-    lastCheck = QDate::fromString(lastCheckS, Qt::ISODate);
-    settings->endGroup();
-
-    // start the periodic update if required
-    if (ui->cbPeriodic->isChecked() && lastCheck < QDate::currentDate())
-    {
-        updateChecker.checkUpdate();
-    }
-}