diff --git a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -8,7 +8,7 @@
 project(Dolphin VERSION ${RELEASE_SERVICE_VERSION})
 
 set(QT_MIN_VERSION "5.11.0")
-set(KF5_MIN_VERSION "5.70.0")
+set(KF5_MIN_VERSION "5.71.0")
 
 # ECM setup
 find_package(ECM ${KF5_MIN_VERSION} CONFIG REQUIRED)
diff --git a/src/main.cpp b/src/main.cpp
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -32,6 +32,7 @@
 #include <KLocalizedString>
 #include <Kdelibs4ConfigMigrator>
 #include <KConfigGui>
+#include <KIO/PreviewJob>
 
 #include <QApplication>
 #include <QCommandLineParser>
@@ -69,6 +70,8 @@
     QApplication app(argc, argv);
     app.setWindowIcon(QIcon::fromTheme(QStringLiteral("system-file-manager"), app.windowIcon()));
 
+    KIO::PreviewJob::setDefaultDevicePixelRatio(app.devicePixelRatio());
+
     KCrash::initialize();
 
     Kdelibs4ConfigMigrator migrate(QStringLiteral("dolphin"));