diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1131ea3..cab93d7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -6,6 +6,7 @@ set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
 set(CMAKE_INCLUDE_CURRENT_DIR ON)
+include_directories("${CMAKE_CURRENT_SOURCE_DIR}/compat")
 
 # set(CMAKE_AUTOUIC ON)
 # set(CMAKE_AUTOMOC ON)
@@ -18,7 +19,7 @@ include(CheckIncludeFiles)
 include(CheckSymbolExists)
 include(FeatureSummary)
 
-find_package(Qt5 COMPONENTS Core DBus Widgets X11Extras Quick LinguistTools REQUIRED)
+find_package(Qt6 COMPONENTS Core DBus Widgets Quick LinguistTools REQUIRED)
 find_package(X11)
 
 # ----------- Check --------------------
@@ -66,13 +67,9 @@ add_subdirectory(checkpass)
 feature_summary(WHAT ALL INCLUDE_QUIET_PACKAGES FATAL_ON_MISSING_REQUIRED_PACKAGES)
 
 
-# Get the installation directory from qmake
-get_target_property(QT_QMAKE_EXECUTABLE ${Qt5Core_QMAKE_EXECUTABLE} IMPORTED_LOCATION)
-if(NOT QT_QMAKE_EXECUTABLE)
-    message(FATAL_ERROR "qmake is not found.")
-endif()
-
-execute_process(COMMAND ${QT_QMAKE_EXECUTABLE} -query QT_INSTALL_QML
+# Get the installation directory from qtpaths
+find_program(QT_PATHS_EXECUTABLE NAMES qtpaths6 REQUIRED)
+execute_process(COMMAND ${QT_PATHS_EXECUTABLE} -query QT_INSTALL_QML
     OUTPUT_VARIABLE INSTALL_QMLDIR
     OUTPUT_STRIP_TRAILING_WHITESPACE
 )
@@ -84,7 +81,7 @@ endif()
 
 # Install translations
 file(GLOB TS_FILES translations/*.ts)
-qt5_add_translation(QM_FILES ${TS_FILES})
+qt6_add_translation(QM_FILES ${TS_FILES})
 add_custom_target(translations DEPENDS ${QM_FILES} SOURCES ${TS_FILES})
 add_dependencies(cutefish-screenlocker translations)
 install(FILES ${QM_FILES} DESTINATION /usr/share/cutefish-screenlocker/translations)
diff --git a/compat/QX11Info b/compat/QX11Info
new file mode 100644
index 0000000..14c3543
--- /dev/null
+++ b/compat/QX11Info
@@ -0,0 +1,36 @@
+/* Qt 6 compatibility layer for the legacy QX11Info API. */
+#ifndef CUTEFISH_QX11INFO_COMPAT
+#define CUTEFISH_QX11INFO_COMPAT
+
+#include <QGuiApplication>
+#include <QtGui/qguiapplication_platform.h>
+#include <xcb/xcb.h>
+
+class QX11Info
+{
+public:
+    static bool isPlatformX11()
+    {
+        return nativeInterface() != nullptr;
+    }
+
+    static xcb_connection_t *connection()
+    {
+        const auto native = nativeInterface();
+        return native ? native->connection() : nullptr;
+    }
+
+    static Display *display()
+    {
+        const auto native = nativeInterface();
+        return native ? native->display() : nullptr;
+    }
+
+private:
+    static QNativeInterface::QX11Application *nativeInterface()
+    {
+        return qGuiApp ? qGuiApp->nativeInterface<QNativeInterface::QX11Application>() : nullptr;
+    }
+};
+
+#endif
diff --git a/screenlocker/CMakeLists.txt b/screenlocker/CMakeLists.txt
index 2b8e62d..54ab20d 100644
--- a/screenlocker/CMakeLists.txt
+++ b/screenlocker/CMakeLists.txt
@@ -17,11 +17,10 @@ add_executable(cutefish-screenlocker
 
 target_link_libraries(cutefish-screenlocker
     PRIVATE
-    Qt5::Core
-    Qt5::DBus
-    Qt5::Widgets
-    Qt5::X11Extras
-    Qt5::Quick
+    Qt6::Core
+    Qt6::DBus
+    Qt6::Widgets
+    Qt6::Quick
 
     ${X11_LIBRARIES}
 )
diff --git a/screenlocker/application.cpp b/screenlocker/application.cpp
index a8adf10..c564b53 100644
--- a/screenlocker/application.cpp
+++ b/screenlocker/application.cpp
@@ -46,7 +46,7 @@
 class FocusOutEventFilter : public QAbstractNativeEventFilter
 {
 public:
-    bool nativeEventFilter(const QByteArray &eventType, void *message, long int *result) override {
+    bool nativeEventFilter(const QByteArray &eventType, void *message, qintptr *result) override {
         Q_UNUSED(result)
         if (qstrcmp(eventType, "xcb_generic_event_t") != 0) {
             return false;
diff --git a/screenlocker/main.cpp b/screenlocker/main.cpp
index 57499bb..ee23b58 100644
--- a/screenlocker/main.cpp
+++ b/screenlocker/main.cpp
@@ -19,6 +19,7 @@
 
 #include "application.h"
 #include <QDBusConnection>
+#include <QFile>
 #include <QTranslator>
 #include <QLocale>
 
diff --git a/screenlocker/qml/LockScreen.qml b/screenlocker/qml/LockScreen.qml
index c9c360f..cd88d82 100644
--- a/screenlocker/qml/LockScreen.qml
+++ b/screenlocker/qml/LockScreen.qml
@@ -21,7 +21,7 @@ import QtQuick 2.12
 import QtQuick.Window 2.12
 import QtQuick.Controls 2.12
 import QtQuick.Layouts 1.12
-import QtGraphicalEffects 1.0
+import Qt5Compat.GraphicalEffects
 
 import Cutefish.Accounts 1.0 as Accounts
 import Cutefish.System 1.0 as System
diff --git a/screenlocker/qml/MprisItem.qml b/screenlocker/qml/MprisItem.qml
index 9c0c8d8..d84fb72 100644
--- a/screenlocker/qml/MprisItem.qml
+++ b/screenlocker/qml/MprisItem.qml
@@ -20,7 +20,7 @@
 import QtQuick 2.12
 import QtQuick.Layouts 1.12
 import QtQuick.Controls 2.12
-import QtGraphicalEffects 1.0
+import Qt5Compat.GraphicalEffects
 import FishUI 1.0 as FishUI
 import Cutefish.Mpris 1.0