diff --git a/dbquery/dbquery.h b/dbquery/dbquery.h
index 5680805..9df9e27 100644
--- a/dbquery/dbquery.h
+++ b/dbquery/dbquery.h
@@ -58,11 +58,11 @@ public:
     bool isFetchingCover() const;
     TagParser::TagValue fieldValue(int row, TagParser::KnownField knownField) const;
 
-    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;
-    Qt::ItemFlags flags(const QModelIndex &index) const;
-    QVariant headerData(int section, Qt::Orientation orientation, int role) const;
-    int rowCount(const QModelIndex &parent = QModelIndex()) const;
-    int columnCount(const QModelIndex &parent = QModelIndex()) const;
+    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const override;
+    Qt::ItemFlags flags(const QModelIndex &index) const override;
+    QVariant headerData(int section, Qt::Orientation orientation, int role) const override;
+    int rowCount(const QModelIndex &parent = QModelIndex()) const override;
+    int columnCount(const QModelIndex &parent = QModelIndex()) const override;
     const QByteArray *cover(const QModelIndex &index) const;
     virtual bool fetchCover(const QModelIndex &index);
     const QString *lyrics(const QModelIndex &index) const;
diff --git a/gui/attachmentsedit.h b/gui/attachmentsedit.h
index 708ce2d..c13215c 100644
--- a/gui/attachmentsedit.h
+++ b/gui/attachmentsedit.h
@@ -23,7 +23,7 @@ class AttachmentsEdit : public QWidget {
 
 public:
     explicit AttachmentsEdit(TagParser::MediaFileInfo *fileInfo, QWidget *parent = nullptr);
-    ~AttachmentsEdit();
+    ~AttachmentsEdit() override;
 
     TagParser::MediaFileInfo *fileInfo();
     void setFileInfo(TagParser::MediaFileInfo *fileInfo, bool updateUi = true);
diff --git a/gui/attachmentsmodel.h b/gui/attachmentsmodel.h
index 3f59dd3..891f09e 100644
--- a/gui/attachmentsmodel.h
+++ b/gui/attachmentsmodel.h
@@ -43,17 +43,17 @@ class AttachmentsModel : public QAbstractTableModel {
     Q_OBJECT
 public:
     AttachmentsModel(QObject *parent = nullptr);
-    ~AttachmentsModel();
+    ~AttachmentsModel() override;
 
-    QVariant data(const QModelIndex &index, int role) const;
-    bool setData(const QModelIndex &index, const QVariant &value, int role);
-    Qt::ItemFlags flags(const QModelIndex &index) const;
-    QVariant headerData(int section, Qt::Orientation orientation, int role) const;
-    int rowCount(const QModelIndex &parent = QModelIndex()) const;
-    int columnCount(const QModelIndex &parent = QModelIndex()) const;
+    QVariant data(const QModelIndex &index, int role) const override;
+    bool setData(const QModelIndex &index, const QVariant &value, int role) override;
+    Qt::ItemFlags flags(const QModelIndex &index) const override;
+    QVariant headerData(int section, Qt::Orientation orientation, int role) const override;
+    int rowCount(const QModelIndex &parent = QModelIndex()) const override;
+    int columnCount(const QModelIndex &parent = QModelIndex()) const override;
 
-    void revert();
-    bool submit();
+    void revert() override;
+    bool submit() override;
     void repealSelection();
 
     TagParser::AbstractAttachment *attachment(const QModelIndex &index);
diff --git a/gui/codeedit.h b/gui/codeedit.h
index 4edcdfd..76d8b21 100644
--- a/gui/codeedit.h
+++ b/gui/codeedit.h
@@ -8,13 +8,13 @@ namespace QtGui {
 class CodeEdit : public QPlainTextEdit {
 public:
     CodeEdit(QWidget *parent = nullptr);
-    ~CodeEdit();
+    ~CodeEdit() override;
 
     const QString &indentation() const;
     void setIndentation(const QString &indentation);
 
 protected:
-    void keyPressEvent(QKeyEvent *e);
+    void keyPressEvent(QKeyEvent *e) override;
 
 private:
     void handleReturn(QKeyEvent *e);
diff --git a/gui/dbquerywidget.h b/gui/dbquerywidget.h
index 0d20aae..f0af385 100644
--- a/gui/dbquerywidget.h
+++ b/gui/dbquerywidget.h
@@ -29,7 +29,7 @@ class DbQueryWidget : public QWidget {
 
 public:
     explicit DbQueryWidget(TagEditorWidget *tagEditorWidget, QWidget *parent = nullptr);
-    ~DbQueryWidget();
+    ~DbQueryWidget() override;
 
     void insertSearchTermsFromTagEdit(TagEdit *tagEdit, bool songSpecific = false);
     SongDescription currentSongDescription() const;
@@ -63,7 +63,7 @@ private slots:
     void showLyricsFromIndex(const QModelIndex &index);
 
 protected:
-    bool eventFilter(QObject *obj, QEvent *event);
+    bool eventFilter(QObject *obj, QEvent *event) override;
 
 private:
     void useQueryResults(QueryResultsModel *queryResults);
diff --git a/gui/entertargetdialog.h b/gui/entertargetdialog.h
index d604a4d..1edd04d 100644
--- a/gui/entertargetdialog.h
+++ b/gui/entertargetdialog.h
@@ -28,7 +28,7 @@ class EnterTargetDialog : public QDialog {
 
 public:
     explicit EnterTargetDialog(QWidget *parent = nullptr);
-    ~EnterTargetDialog();
+    ~EnterTargetDialog() override;
 
     TagParser::TagTarget target() const;
     void setTarget(const TagParser::TagTarget &target, const TagParser::MediaFileInfo *file = nullptr);
diff --git a/gui/filefilterproxymodel.h b/gui/filefilterproxymodel.h
index 68f3cef..d62f09e 100644
--- a/gui/filefilterproxymodel.h
+++ b/gui/filefilterproxymodel.h
@@ -21,8 +21,8 @@ public:
     bool isFileAccepted(const QString &path) const;
 
 protected:
-    virtual bool filterAcceptsRow(int sourceRow, const QModelIndex &sourceParent) const;
-    void sort(int column, Qt::SortOrder order = Qt::AscendingOrder);
+    bool filterAcceptsRow(int sourceRow, const QModelIndex &sourceParent) const override;
+    void sort(int column, Qt::SortOrder order = Qt::AscendingOrder) override;
 
 private:
     bool m_filterEnabled;
diff --git a/gui/fileinfomodel.h b/gui/fileinfomodel.h
index acf2b9e..6ca4e65 100644
--- a/gui/fileinfomodel.h
+++ b/gui/fileinfomodel.h
@@ -18,7 +18,7 @@ class FileInfoModel : public QStandardItemModel {
 public:
     explicit FileInfoModel(QObject *parent = nullptr);
 
-    QVariant headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const;
+    QVariant headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const override;
 
     const TagParser::MediaFileInfo *fileInfo() const;
     void setFileInfo(TagParser::MediaFileInfo &fileInfo, TagParser::Diagnostics &diag, TagParser::Diagnostics *diagReparsing = nullptr);
diff --git a/gui/mainwindow.h b/gui/mainwindow.h
index b43b905..1edf919 100644
--- a/gui/mainwindow.h
+++ b/gui/mainwindow.h
@@ -39,7 +39,7 @@ class MainWindow : public QMainWindow {
 
 public:
     explicit MainWindow(QWidget *parent = nullptr);
-    ~MainWindow();
+    ~MainWindow() override;
 
     // file browser
     QString currentDirectory() const;
@@ -52,7 +52,7 @@ public slots:
     void startParsing(const QString &path);
 
 protected:
-    bool event(QEvent *event);
+    bool event(QEvent *event) override;
 
 private slots:
     // file selection
diff --git a/gui/minimumemptyspinbox.h b/gui/minimumemptyspinbox.h
index 35c71d1..375fd66 100644
--- a/gui/minimumemptyspinbox.h
+++ b/gui/minimumemptyspinbox.h
@@ -11,8 +11,8 @@ public:
     explicit MinimumEmptySpinBox(QWidget *parent = nullptr);
 
 protected:
-    virtual int valueFromText(const QString &text) const;
-    virtual QString textFromValue(int val) const;
+    int valueFromText(const QString &text) const override;
+    QString textFromValue(int val) const override;
 };
 
 } // namespace QtGui
diff --git a/gui/notificationlabel.h b/gui/notificationlabel.h
index 1aaf727..e68dbbf 100644
--- a/gui/notificationlabel.h
+++ b/gui/notificationlabel.h
@@ -38,8 +38,8 @@ public:
     std::size_t maxLineCount() const;
     std::size_t currentLineCount() const;
 
-    virtual QSize sizeHint() const;
-    virtual QSize minimumSizeHint() const;
+    QSize sizeHint() const override;
+    QSize minimumSizeHint() const override;
 
 public slots:
     void setText(const QString &text);
@@ -54,8 +54,8 @@ public slots:
     void setMaxLineCount(std::size_t maxLineCount);
 
 protected:
-    void paintEvent(QPaintEvent *event);
-    void mouseDoubleClickEvent(QMouseEvent *event);
+    void paintEvent(QPaintEvent *event) override;
+    void mouseDoubleClickEvent(QMouseEvent *event) override;
 
 private slots:
     void updateAnimation();
diff --git a/gui/notificationmodel.h b/gui/notificationmodel.h
index d574189..ad47b66 100644
--- a/gui/notificationmodel.h
+++ b/gui/notificationmodel.h
@@ -12,11 +12,11 @@ class DiagModel : public QAbstractListModel {
 public:
     explicit DiagModel(QObject *parent = nullptr);
 
-    QVariant headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const;
-    int columnCount(const QModelIndex &parent) const;
-    int rowCount(const QModelIndex &parent = QModelIndex()) const;
-    Qt::ItemFlags flags(const QModelIndex &index) const;
-    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;
+    QVariant headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const override;
+    int columnCount(const QModelIndex &parent) const override;
+    int rowCount(const QModelIndex &parent = QModelIndex()) const override;
+    Qt::ItemFlags flags(const QModelIndex &index) const override;
+    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const override;
 
     const TagParser::Diagnostics &diagnostics() const;
     void setDiagnostics(const TagParser::Diagnostics &diagnostics);
diff --git a/gui/pathlineedit.h b/gui/pathlineedit.h
index 926607a..dc964fa 100644
--- a/gui/pathlineedit.h
+++ b/gui/pathlineedit.h
@@ -24,7 +24,7 @@ public:
     void editText(const QString &text);
 
 protected:
-    virtual void contextMenuEvent(QContextMenuEvent *event);
+    void contextMenuEvent(QContextMenuEvent *event) override;
 };
 
 } // namespace QtGui
diff --git a/gui/picturepreviewselection.h b/gui/picturepreviewselection.h
index 2c37821..1fe2e5b 100644
--- a/gui/picturepreviewselection.h
+++ b/gui/picturepreviewselection.h
@@ -36,7 +36,7 @@ class PicturePreviewSelection : public QWidget {
 public:
     explicit PicturePreviewSelection(
         TagParser::Tag *tag = nullptr, TagParser::KnownField field = TagParser::KnownField::Invalid, QWidget *parent = nullptr);
-    ~PicturePreviewSelection();
+    ~PicturePreviewSelection() override;
 
     TagParser::Tag *tag() const;
     TagParser::KnownField field() const;
@@ -64,10 +64,10 @@ signals:
     void pictureChanged();
 
 protected:
-    void changeEvent(QEvent *event);
-    void resizeEvent(QResizeEvent *event);
-    void dragEnterEvent(QDragEnterEvent *event);
-    void dropEvent(QDropEvent *event);
+    void changeEvent(QEvent *event) override;
+    void resizeEvent(QResizeEvent *event) override;
+    void dragEnterEvent(QDragEnterEvent *event) override;
+    void dropEvent(QDropEvent *event) override;
 
 private slots:
     void typeSwitched(int index);
diff --git a/gui/renamefilesdialog.h b/gui/renamefilesdialog.h
index 16b125b..fbcfd7c 100644
--- a/gui/renamefilesdialog.h
+++ b/gui/renamefilesdialog.h
@@ -26,13 +26,13 @@ class RenameFilesDialog : public QDialog {
 
 public:
     explicit RenameFilesDialog(QWidget *parent = nullptr);
-    ~RenameFilesDialog();
+    ~RenameFilesDialog() override;
 
     QString directory() const;
     void setDirectory(const QString &directory);
 
 protected:
-    bool event(QEvent *event);
+    bool event(QEvent *event) override;
 
 private slots:
     void showScriptFileSelectionDlg();
diff --git a/gui/settingsdialog.h b/gui/settingsdialog.h
index 320e7c8..812a8a1 100644
--- a/gui/settingsdialog.h
+++ b/gui/settingsdialog.h
@@ -51,7 +51,7 @@ class SettingsDialog : public Dialogs::SettingsDialog {
     Q_OBJECT
 public:
     explicit SettingsDialog(QWidget *parent = nullptr);
-    ~SettingsDialog();
+    ~SettingsDialog() override;
 };
 
 } // namespace QtGui
diff --git a/gui/tageditorwidget.h b/gui/tageditorwidget.h
index 3d0715c..6ecd02e 100644
--- a/gui/tageditorwidget.h
+++ b/gui/tageditorwidget.h
@@ -44,7 +44,7 @@ class TagEditorWidget : public QWidget {
 
 public:
     explicit TagEditorWidget(QWidget *parent = nullptr);
-    ~TagEditorWidget();
+    ~TagEditorWidget() override;
 
 public:
     bool isFileOperationOngoing() const;
@@ -93,7 +93,7 @@ signals:
     void fileShown();
 
 protected:
-    bool event(QEvent *event);
+    bool event(QEvent *event) override;
 
 private slots:
     // editor
diff --git a/gui/tagfieldedit.h b/gui/tagfieldedit.h
index 6013461..a302fc7 100644
--- a/gui/tagfieldedit.h
+++ b/gui/tagfieldedit.h
@@ -60,7 +60,7 @@ signals:
     void returnPressed();
 
 protected:
-    virtual bool eventFilter(QObject *obj, QEvent *event);
+    bool eventFilter(QObject *obj, QEvent *event) override;
 
 private slots:
     void handleRestoreButtonClicked();
diff --git a/renamingutility/filesystemitemmodel.h b/renamingutility/filesystemitemmodel.h
index 0606165..a8d1ebd 100644
--- a/renamingutility/filesystemitemmodel.h
+++ b/renamingutility/filesystemitemmodel.h
@@ -18,16 +18,16 @@ public:
     void setRootItem(FileSystemItem *rootItem);
     FileSystemItem *fileSystemItemFromIndex(const QModelIndex &index);
     const FileSystemItem *fileSystemItemFromIndex(const QModelIndex &index) const;
-    QVariant data(const QModelIndex &index, int role) const;
-    bool setData(const QModelIndex &index, const QVariant &value, int role);
-    QVariant headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const;
-    QModelIndex index(int row, int column, const QModelIndex &parent = QModelIndex()) const;
+    QVariant data(const QModelIndex &index, int role) const override;
+    bool setData(const QModelIndex &index, const QVariant &value, int role) override;
+    QVariant headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const override;
+    QModelIndex index(int row, int column, const QModelIndex &parent = QModelIndex()) const override;
     QModelIndex index(FileSystemItem *item, int column = 0) const;
-    QModelIndex parent(const QModelIndex &index) const;
+    QModelIndex parent(const QModelIndex &index) const override;
     QModelIndex counterpart(const QModelIndex &index, int column);
-    int rowCount(const QModelIndex &parent = QModelIndex()) const;
-    bool hasChildren(const QModelIndex &parent = QModelIndex()) const;
-    int columnCount(const QModelIndex &index = QModelIndex()) const;
+    int rowCount(const QModelIndex &parent = QModelIndex()) const override;
+    bool hasChildren(const QModelIndex &parent = QModelIndex()) const override;
+    int columnCount(const QModelIndex &index = QModelIndex()) const override;
 
 private:
     FileSystemItem *m_rootItem;
diff --git a/renamingutility/filteredfilesystemitemmodel.h b/renamingutility/filteredfilesystemitemmodel.h
index d2fb798..7500987 100644
--- a/renamingutility/filteredfilesystemitemmodel.h
+++ b/renamingutility/filteredfilesystemitemmodel.h
@@ -17,8 +17,8 @@ public:
     void setStatusFilter(ItemStatus statusFilter);
 
 protected:
-    bool filterAcceptsRow(int sourceRow, const QModelIndex &sourceParent) const;
-    bool filterAcceptsColumn(int sourceColumn, const QModelIndex &sourceParent) const;
+    bool filterAcceptsRow(int sourceRow, const QModelIndex &sourceParent) const override;
+    bool filterAcceptsColumn(int sourceColumn, const QModelIndex &sourceParent) const override;
 
 private:
     ItemStatus m_statusFilter;