diff --git a/sbin/build_deb.sh b/sbin/build_deb.sh
index ca426b3..13731f9 100644
--- a/sbin/build_deb.sh
+++ b/sbin/build_deb.sh
@@ -66,4 +66,4 @@ Description: Lightweight slideshow for photo frames
  Simple, lightweight slideshow designed for low power devices.
 EOF
 
-dpkg-deb --build "$STAGE_DIR" "$DIST_DIR/${PACKAGE_NAME}_${VERSION}_${ARCH}.deb"
+dpkg-deb --build -Zgzip "$STAGE_DIR" "$DIST_DIR/${PACKAGE_NAME}_${VERSION}_${ARCH}.deb"
diff --git a/src/mainwindow.cpp b/src/mainwindow.cpp
index 582f888..c2be6bd 100644
--- a/src/mainwindow.cpp
+++ b/src/mainwindow.cpp
@@ -18,6 +18,7 @@
 #include <QGraphicsPixmapItem>
 #include <QApplication>
 #include <QScreen>
+#include <QTransform>
 
 MainWindow::MainWindow(QWidget *parent) :
     QMainWindow(parent),
@@ -170,11 +171,11 @@ void MainWindow::updateImage()
       return;
 
     QLabel *label = this->findChild<QLabel*>("image");
-    const QPixmap* oldImage = label->pixmap();
-    if (oldImage != NULL && transitionSeconds > 0)
+    QPixmap oldImage = label->pixmap(Qt::ReturnByValue);
+    if (!oldImage.isNull() && transitionSeconds > 0)
     {
       QPalette palette;
-      palette.setBrush(QPalette::Background, *oldImage);
+      palette.setBrush(QPalette::Window, oldImage);
       this->setPalette(palette);
     }
 
@@ -213,7 +214,7 @@ void MainWindow::updateImage()
 
     label->setPixmap(background);
 
-    if (oldImage != NULL && transitionSeconds > 0)
+    if (!oldImage.isNull() && transitionSeconds > 0)
     {
       auto effect = new QGraphicsOpacityEffect(label);
       effect->setOpacity(0.0);
@@ -273,9 +274,9 @@ QPixmap MainWindow::getBlurredBackground(const QPixmap& originalSize, const QPix
 
 QPixmap MainWindow::getRotatedPixmap(const QPixmap& p)
 {
-    QMatrix matrix;
-    matrix.rotate(currentImage.rotation);
-    return p.transformed(matrix);
+    QTransform transform;
+    transform.rotate(currentImage.rotation);
+    return p.transformed(transform);
 }
 
 QPixmap MainWindow::getScaledPixmap(const QPixmap& p)
@@ -325,12 +326,12 @@ void MainWindow::drawBackground(const QPixmap& originalSize, const QPixmap& scal
         QPixmap background = blur(originalSize.scaledToHeight(height()));
         QRect rect((background.width() - width())/2, 0, width(), height());
         background = background.copy(rect);
-        palette.setBrush(QPalette::Background, background);
+        palette.setBrush(QPalette::Window, background);
     } else {
         QPixmap background = blur(originalSize.scaledToHeight(height()));
         QRect rect((background.width() - width())/2, 0, width(), height());
         background = background.copy(rect);
-        palette.setBrush(QPalette::Background, background);
+        palette.setBrush(QPalette::Window, background);
     }
     this->setPalette(palette);
 }