diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
index 40bde6da..985bce38 100644
--- a/.github/workflows/windows.yml
+++ b/.github/workflows/windows.yml
@@ -42,7 +42,7 @@ jobs:
           version: ${{ matrix.qt_ver }}
           arch: ${{ matrix.qt_arch }}
           cache: ${{steps.cache-qt.outputs.cache-hit}}
-          modules: 'qt5compat qtmultimedia qtshadertools qtimageformats'
+          modules: 'qt5compat qtmultimedia qtshadertools qtimageformats qtspeech'
           
       - name: msvc-build
         id: build
diff --git a/src/FluTheme.cpp b/src/FluTheme.cpp
index 5ba8418e..4372d971 100644
--- a/src/FluTheme.cpp
+++ b/src/FluTheme.cpp
@@ -2,8 +2,14 @@
 
 #include "Def.h"
 #include "FluColors.h"
-#include <QPalette>
+#if (QT_VERSION >= QT_VERSION_CHECK(6, 5, 0))
 #include <QStyleHints>
+#elif ((QT_VERSION >= QT_VERSION_CHECK(6, 2, 1)))
+#include <QPalette>
+#include <QtGui/qpa/qplatformtheme.h>
+#include <QtGui/private/qguiapplication_p.h>
+#endif
+
 #include <QGuiApplication>
 
 FluTheme* FluTheme::m_instance = nullptr;
@@ -44,7 +50,15 @@ bool FluTheme::eventFilter(QObject *obj, QEvent *event)
 
 bool FluTheme::systemDark()
 {
-    return QGuiApplication::styleHints()->colorScheme() == Qt::ColorScheme::Dark;
+#if (QT_VERSION >= QT_VERSION_CHECK(6, 5, 0))
+    return (QGuiApplication::styleHints()->colorScheme() == Qt::ColorScheme::Dark);
+#elif ((QT_VERSION >= QT_VERSION_CHECK(6, 2, 1)))
+    if (const QPlatformTheme * const theme = QGuiApplicationPrivate::platformTheme()) {
+        return (theme->appearance() == QPlatformTheme::Appearance::Dark);
+    }
+    return false;
+#endif
+    return false;
 }
 
 bool FluTheme::dark(){