diff --git a/dialogs/updatedialog.cpp b/dialogs/updatedialog.cpp
new file mode 100644
index 0000000..0236d0f
--- /dev/null
+++ b/dialogs/updatedialog.cpp
@@ -0,0 +1,98 @@
+#include "updatedialog.h"
+#include "ui_updatedialog.h"
+
+#include <QNetworkAccessManager>
+#include <QNetworkRequest>
+#include <QNetworkReply>
+#include <QDebug>
+#include <QVersionNumber>
+#include <QJsonParseError>
+#include <QJsonDocument>
+#include <QJsonArray>
+#include <QJsonValue>
+#include <QJsonObject>
+#include <QDesktopServices>
+#include <QMessageBox>
+
+#include "zeiterfassungsettings.h"
+
+UpdateDialog::UpdateDialog(ZeiterfassungSettings &settings, QNetworkAccessManager *manager, QWidget *parent) :
+    QDialog(parent),
+    ui(new Ui::UpdateDialog),
+    m_settings(settings)
+{
+    ui->setupUi(this);
+
+    setAttribute(Qt::WA_DeleteOnClose);
+
+    connect(ui->buttonBox, &QDialogButtonBox::accepted, this, &UpdateDialog::submit);
+    connect(ui->buttonBox, &QDialogButtonBox::rejected, this, [=](){
+        if(ui->checkBoxDontShow->isChecked())
+            m_settings.setLastUpdateCheck(QDate::currentDate());
+        reject();
+    });
+
+    m_reply = manager->get(QNetworkRequest(QUrl(QStringLiteral("https://api.github.com/repos/0xFEEDC0DE64/QtZeiterfassung/releases"))));
+    connect(m_reply, &QNetworkReply::finished, this, &UpdateDialog::finished);
+}
+
+UpdateDialog::~UpdateDialog()
+{
+    delete ui;
+}
+
+void UpdateDialog::finished()
+{
+    if(m_reply->error() != QNetworkReply::NoError)
+    {
+        qWarning() << "request error" << m_reply->error() << m_reply->errorString();
+        return;
+    }
+
+    QJsonParseError error;
+    auto document = QJsonDocument::fromJson(m_reply->readAll(), &error);
+
+    if(error.error != QJsonParseError::NoError)
+    {
+        qWarning() << "parse error" << error.error << error.errorString();
+        return;
+    }
+
+    if(!document.isArray())
+    {
+        qWarning() << "document is not an array!";
+        return;
+    }
+
+    auto appVersion = QVersionNumber::fromString(QCoreApplication::applicationVersion());
+
+    auto array = document.array();
+
+    for(const auto &releaseVal : array)
+    {
+        auto releaseObj = releaseVal.toObject();
+        auto version = QVersionNumber::fromString(releaseObj.value("tag_name").toString());
+
+        if(appVersion < version)
+        {
+            m_url = QUrl(releaseObj.value("html_url").toString());
+            ui->labelDescription->setText(releaseObj.value("body").toString());
+
+            show();
+            return;
+        }
+    }
+
+    deleteLater();
+}
+
+void UpdateDialog::submit()
+{
+    if(ui->checkBoxDontShow->isChecked())
+        m_settings.setLastUpdateCheck(QDate::currentDate());
+
+    if(!QDesktopServices::openUrl(m_url))
+        QMessageBox::warning(this, tr("Could not open default webbrowser!"), tr("Could not open default webbrowser!"));
+
+    accept();
+}
diff --git a/dialogs/updatedialog.h b/dialogs/updatedialog.h
new file mode 100644
index 0000000..7f7b836
--- /dev/null
+++ b/dialogs/updatedialog.h
@@ -0,0 +1,33 @@
+#ifndef UPDATEDIALOG_H
+#define UPDATEDIALOG_H
+
+#include <QDialog>
+#include <QUrl>
+
+class QNetworkAccessManager;
+class QNetworkReply;
+
+class ZeiterfassungSettings;
+namespace Ui { class UpdateDialog; }
+
+class UpdateDialog : public QDialog
+{
+    Q_OBJECT
+
+public:
+    explicit UpdateDialog(ZeiterfassungSettings &settings, QNetworkAccessManager *manager, QWidget *parent = 0);
+    ~UpdateDialog();
+
+private Q_SLOTS:
+    void finished();
+    void submit();
+
+private:
+    Ui::UpdateDialog *ui;
+    ZeiterfassungSettings &m_settings;
+    QNetworkReply *m_reply;
+
+    QUrl m_url;
+};
+
+#endif // UPDATEDIALOG_H
diff --git a/dialogs/updatedialog.ui b/dialogs/updatedialog.ui
new file mode 100644
index 0000000..a130bde
--- /dev/null
+++ b/dialogs/updatedialog.ui
@@ -0,0 +1,90 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>UpdateDialog</class>
+ <widget class="QDialog" name="UpdateDialog">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>447</width>
+    <height>280</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Dialog</string>
+  </property>
+  <layout class="QVBoxLayout" name="verticalLayout" stretch="0,0,1,0,0">
+   <item>
+    <widget class="QLabel" name="labelTitle">
+     <property name="font">
+      <font>
+       <pointsize>20</pointsize>
+      </font>
+     </property>
+     <property name="text">
+      <string>New update available!</string>
+     </property>
+    </widget>
+   </item>
+   <item>
+    <widget class="QLabel" name="label">
+     <property name="text">
+      <string>There is a new release available to download!</string>
+     </property>
+    </widget>
+   </item>
+   <item>
+    <widget class="QLabel" name="labelDescription">
+     <property name="frameShape">
+      <enum>QFrame::WinPanel</enum>
+     </property>
+     <property name="frameShadow">
+      <enum>QFrame::Sunken</enum>
+     </property>
+     <property name="text">
+      <string notr="true">TextLabel</string>
+     </property>
+     <property name="alignment">
+      <set>Qt::AlignLeading|Qt::AlignLeft|Qt::AlignTop</set>
+     </property>
+    </widget>
+   </item>
+   <item>
+    <layout class="QHBoxLayout" name="horizontalLayout">
+     <item>
+      <spacer name="horizontalSpacer">
+       <property name="orientation">
+        <enum>Qt::Horizontal</enum>
+       </property>
+       <property name="sizeHint" stdset="0">
+        <size>
+         <width>40</width>
+         <height>20</height>
+        </size>
+       </property>
+      </spacer>
+     </item>
+     <item>
+      <widget class="QCheckBox" name="checkBoxDontShow">
+       <property name="text">
+        <string>Dont show today anymore</string>
+       </property>
+      </widget>
+     </item>
+    </layout>
+   </item>
+   <item>
+    <widget class="QDialogButtonBox" name="buttonBox">
+     <property name="orientation">
+      <enum>Qt::Horizontal</enum>
+     </property>
+     <property name="standardButtons">
+      <set>QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set>
+     </property>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <resources/>
+ <connections/>
+</ui>
diff --git a/mainwindow.cpp b/mainwindow.cpp
index ada0553..33ac7ea 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -20,6 +20,7 @@
 #include "dialogs/bookingdialog.h"
 #include "dialogs/timeassignmentdialog.h"
 #include "dialogs/settingsdialog.h"
+#include "dialogs/updatedialog.h"
 #include "strips/bookingstrip.h"
 #include "strips/timeassignmentstrip.h"
 #include "models/bookingsmodel.h"
@@ -112,6 +113,9 @@ MainWindow::MainWindow(ZeiterfassungSettings &settings, Zeiterfassung &erfassung
     m_holidaysLabel->setFrameShadow(QFrame::Sunken);
 
     refresh(true);
+
+    if(settings.lastUpdateCheck().isNull() || settings.lastUpdateCheck() < QDate::currentDate())
+        new UpdateDialog(settings, erfassung.manager(), this);
 }
 
 MainWindow::~MainWindow()
diff --git a/mainwindow.ui b/mainwindow.ui
index 9c5f41d..a0f6776 100644
--- a/mainwindow.ui
+++ b/mainwindow.ui
@@ -196,7 +196,7 @@
           <x>0</x>
           <y>0</y>
           <width>1220</width>
-          <height>438</height>
+          <height>454</height>
          </rect>
         </property>
         <layout class="QVBoxLayout" name="verticalLayout2">
@@ -258,7 +258,7 @@
      <x>0</x>
      <y>0</y>
      <width>1242</width>
-     <height>26</height>
+     <height>22</height>
     </rect>
    </property>
    <widget class="QMenu" name="menuFile">
diff --git a/zeiterfassung.cpp b/zeiterfassung.cpp
index 97bd4f3..34932df 100644
--- a/zeiterfassung.cpp
+++ b/zeiterfassung.cpp
@@ -33,6 +33,11 @@ void Zeiterfassung::setUrl(const QString &url)
         Q_EMIT urlChanged(m_url = url);
 }
 
+QNetworkAccessManager *Zeiterfassung::manager() const
+{
+    return m_manager;
+}
+
 bool Zeiterfassung::doLoginPage()
 {
     if(m_replies.login)
diff --git a/zeiterfassung.h b/zeiterfassung.h
index 18a23e0..6349414 100644
--- a/zeiterfassung.h
+++ b/zeiterfassung.h
@@ -21,6 +21,8 @@ public:
     const QString &url() const;
     void setUrl(const QString &url);
 
+    QNetworkAccessManager *manager() const;
+
     struct UserInfo
     {
         int userId;
diff --git a/zeiterfassung.pro b/zeiterfassung.pro
index 8225a79..67d3fc7 100755
--- a/zeiterfassung.pro
+++ b/zeiterfassung.pro
@@ -30,7 +30,8 @@ SOURCES += main.cpp \
     strips/timeassignmentstrip.cpp \
     dialogs/bookingdialog.cpp \
     models/bookingsmodel.cpp \
-    strips/bookingstrip.cpp
+    strips/bookingstrip.cpp \
+    dialogs/updatedialog.cpp
 
 HEADERS += \
     zeiterfassung.h \
@@ -46,7 +47,8 @@ HEADERS += \
     strips/timeassignmentstrip.h \
     dialogs/bookingdialog.h \
     models/bookingsmodel.h \
-    strips/bookingstrip.h
+    strips/bookingstrip.h \
+    dialogs/updatedialog.h
 
 FORMS += \
     mainwindow.ui \
@@ -57,7 +59,8 @@ FORMS += \
     dialogs/timeassignmentdialog.ui \
     strips/timeassignmentstrip.ui \
     dialogs/bookingdialog.ui \
-    strips/bookingstrip.ui
+    strips/bookingstrip.ui \
+    dialogs/updatedialog.ui
 
 RESOURCES += \
     resources.qrc
diff --git a/zeiterfassungsettings.cpp b/zeiterfassungsettings.cpp
index ae71a73..73a90f7 100644
--- a/zeiterfassungsettings.cpp
+++ b/zeiterfassungsettings.cpp
@@ -172,6 +172,16 @@ void ZeiterfassungSettings::setTimeAssignmentBackgroundColor(const QString timeA
     setValue("timeAssignmentBackgroundColor", timeAssignmentBackgroundColor);
 }
 
+QDate ZeiterfassungSettings::lastUpdateCheck() const
+{
+    return value("lastUpdateCheck").toDate();
+}
+
+void ZeiterfassungSettings::setLastUpdateCheck(const QDate &lastUpdateCheck)
+{
+    setValue("lastUpdateCheck", lastUpdateCheck);
+}
+
 void ZeiterfassungSettings::prepentItem(const QString &name, const QString &item)
 {
     if(item.trimmed().isEmpty())
diff --git a/zeiterfassungsettings.h b/zeiterfassungsettings.h
index 80793d0..1ea6932 100644
--- a/zeiterfassungsettings.h
+++ b/zeiterfassungsettings.h
@@ -3,6 +3,9 @@
 
 #include <QSettings>
 #include <QLocale>
+#include <QString>
+#include <QStringList>
+#include <QDate>
 
 class ZeiterfassungSettings : public QSettings
 {
@@ -58,6 +61,9 @@ public:
     QString timeAssignmentBackgroundColor() const;
     void setTimeAssignmentBackgroundColor(const QString timeAssignmentBackgroundColor);
 
+    QDate lastUpdateCheck() const;
+    void setLastUpdateCheck(const QDate &lastUpdateCheck);
+
 private:
     void prepentItem(const QString &name, const QString &item);
 };