diff --git a/.github/workflows/ubuntu.yml b/.github/workflows/ubuntu.yml
index f3feb6a..2828371 100644
--- a/.github/workflows/ubuntu.yml
+++ b/.github/workflows/ubuntu.yml
@@ -3,30 +3,6 @@ name: Ubuntu CI
 on: [push, pull_request]
 
 jobs:
-  ubuntu-22-04-build:
-    runs-on: ubuntu-22.04
-    steps:
-      - uses: actions/checkout@v4
-      - name: Get build dept.
-        run: |
-          sudo apt update
-          sudo apt install cmake qtbase5-dev libqt5svg5-dev qttools5-dev libexiv2-dev
-      - name: Build it
-        run: |
-          mkdir build
-          cd build
-          cmake ../ -DPREFER_QT_5=ON
-          make
-          cpack -G DEB
-      - name: Try install it
-        run: |
-          cd build
-          sudo apt install ./*.deb
-      - uses: actions/upload-artifact@v4
-        with:
-          name: ubuntu-22.04-deb-package
-          path: build/*.deb
-
   ubuntu-24-04-build:
     runs-on: ubuntu-24.04
     steps:
diff --git a/CMakeLists.txt b/CMakeLists.txt
index ae2fe86..6defccb 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -10,7 +10,6 @@ include(GNUInstallDirs)
 include(FeatureSummary)
 
 option (EXIV2_METADATA_SUPPORT "Better image metadata support via libexiv2" ON)
-option (PREFER_QT_5 "Prefer to use Qt 5" OFF)
 option (TRANSLATION_RESOURCE_EMBEDDING "Embedding .qm translation files inside resource" OFF)
 
 set (CMAKE_CXX_STANDARD 17)
@@ -18,27 +17,15 @@ set (CMAKE_CXX_STANDARD_REQUIRED ON)
 set (CMAKE_AUTOMOC ON)
 set (CMAKE_AUTORCC ON)
 
-if (PREFER_QT_5)
-    find_package(QT NAMES Qt5 REQUIRED COMPONENTS Core)
-else ()
-    find_package(QT NAMES Qt6 REQUIRED COMPONENTS Core)
-endif ()
+find_package(QT NAMES Qt6 REQUIRED COMPONENTS Core)
 
-if (${QT_VERSION_MAJOR} EQUAL "5")
-    set (QT_MINIMUM_VERSION "5.15.2")
-else ()
-    set (QT_MINIMUM_VERSION "6.4")
-endif ()
+set (QT_MINIMUM_VERSION "6.4")
 
 find_package(Qt${QT_VERSION_MAJOR} ${QT_MINIMUM_VERSION} REQUIRED
-    COMPONENTS Widgets Svg LinguistTools
+    COMPONENTS Widgets Svg SvgWidgets LinguistTools
     OPTIONAL_COMPONENTS DBus
 )
 
-if (${QT_VERSION_MAJOR} EQUAL "6")
-    find_package(Qt${QT_DEFAULT_MAJOR_VERSION} ${QT_MINIMUM_VERSION} CONFIG REQUIRED SvgWidgets)
-endif ()
-
 if (EXIV2_METADATA_SUPPORT)
     find_package(exiv2)
     set_package_properties(exiv2 PROPERTIES
@@ -117,34 +104,23 @@ add_executable (${EXE_NAME}
     ${PPIC_RC_FILES}
 )
 
-if (${QT_VERSION_MAJOR} EQUAL "6")
-    set(ADD_TRANSLATIONS_ADDITIONAL_ARGS)
+set(ADD_TRANSLATIONS_ADDITIONAL_ARGS)
 
-    if (Qt6_VERSION VERSION_GREATER_EQUAL "6.9.0")
-        set(ADD_TRANSLATIONS_ADDITIONAL_ARGS MERGE_QT_TRANSLATIONS)
-    endif()
+if (Qt6_VERSION VERSION_GREATER_EQUAL "6.9.0")
+    set(ADD_TRANSLATIONS_ADDITIONAL_ARGS MERGE_QT_TRANSLATIONS)
+endif()
 
-    if (TRANSLATION_RESOURCE_EMBEDDING)
-        qt_add_translations(${EXE_NAME} ${ADD_TRANSLATIONS_ADDITIONAL_ARGS} TS_FILES ${PPIC_TS_FILES})
-    else()
-        qt_add_translations(${EXE_NAME} ${ADD_TRANSLATIONS_ADDITIONAL_ARGS} TS_FILES ${PPIC_TS_FILES} QM_FILES_OUTPUT_VARIABLE PPIC_QM_FILES)
-    endif()
+if (TRANSLATION_RESOURCE_EMBEDDING)
+    qt_add_translations(${EXE_NAME} ${ADD_TRANSLATIONS_ADDITIONAL_ARGS} TS_FILES ${PPIC_TS_FILES})
 else()
-    qt_create_translation(PPIC_QM_FILES ${PPIC_CPP_FILES_FOR_I18N} ${PPIC_TS_FILES})
+    qt_add_translations(${EXE_NAME} ${ADD_TRANSLATIONS_ADDITIONAL_ARGS} TS_FILES ${PPIC_TS_FILES} QM_FILES_OUTPUT_VARIABLE PPIC_QM_FILES)
 endif()
 
 target_sources(${EXE_NAME} PRIVATE ${PPIC_QM_FILES})
 
-target_link_libraries (${EXE_NAME} Qt${QT_VERSION_MAJOR}::Widgets Qt${QT_VERSION_MAJOR}::Svg)
-if (${QT_VERSION_MAJOR} EQUAL "6")
-    target_link_libraries (${EXE_NAME} Qt::SvgWidgets)
-endif ()
+target_link_libraries (${EXE_NAME} Qt${QT_VERSION_MAJOR}::Widgets Qt${QT_VERSION_MAJOR}::Svg Qt${QT_VERSION_MAJOR}::SvgWidgets)
 
 if (exiv2_FOUND)
-    if(NOT TARGET Exiv2::exiv2lib AND TARGET exiv2lib)
-        # for exiv2 0.27.x
-        add_library(Exiv2::exiv2lib ALIAS exiv2lib)
-    endif()
     target_link_libraries (${EXE_NAME}
         Exiv2::exiv2lib
     )
@@ -153,7 +129,7 @@ if (exiv2_FOUND)
     )
 endif ()
 
-if (TARGET Qt5::DBus OR TARGET Qt6::DBus)
+if (TARGET Qt6::DBus)
     target_link_libraries (${EXE_NAME}
         Qt${QT_VERSION_MAJOR}::DBus
     )
diff --git a/app/framelesswindow.cpp b/app/framelesswindow.cpp
index d5c0a39..4183713 100644
--- a/app/framelesswindow.cpp
+++ b/app/framelesswindow.cpp
@@ -17,14 +17,7 @@ FramelessWindow::FramelessWindow(QWidget *parent)
     , m_oldCursorShape(Qt::ArrowCursor)
     , m_oldEdges()
 {
-#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
     this->setWindowFlags(Qt::Window | Qt::FramelessWindowHint | Qt::WindowMinMaxButtonsHint);
-#else
-    // There is a bug in Qt 5 that will make pressing Meta+Up cause the app
-    // fullscreen under Windows, see QTBUG-91226 to learn more.
-    // The bug seems no longer exists in Qt 6 (I only tested it under Qt 6.3.0).
-    this->setWindowFlags(Qt::Window | Qt::FramelessWindowHint | Qt::WindowMinimizeButtonHint);
-#endif // QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
     this->setMouseTracking(true);
     this->setAttribute(Qt::WA_Hover, true);
     this->installEventFilter(this);
@@ -97,11 +90,7 @@ bool FramelessWindow::mousePress(QMouseEvent* event)
 {
     if (event->buttons() & Qt::LeftButton && !isMaximized() && !isFullScreen()) {
         QWindow* win = window()->windowHandle();
-#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
         Qt::Edges edges = this->getEdgesByPos(event->globalPosition().toPoint(), win->frameGeometry());
-#else
-        Qt::Edges edges = this->getEdgesByPos(event->globalPos(), win->frameGeometry());
-#endif // QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
         if (edges) {
             win->startSystemResize(edges);
             return true;
diff --git a/app/graphicsview.cpp b/app/graphicsview.cpp
index f5b7555..a36d4d7 100644
--- a/app/graphicsview.cpp
+++ b/app/graphicsview.cpp
@@ -41,9 +41,7 @@ void GraphicsView::showFileFromPath(const QString &filePath)
         QImageReader imageReader(filePath);
         imageReader.setAutoTransform(true);
         imageReader.setDecideFormatFromContent(true);
-#if QT_VERSION > QT_VERSION_CHECK(6, 0, 0)
         imageReader.setAllocationLimit(0);
-#endif //QT_VERSION > QT_VERSION_CHECK(6, 0, 0)
 
         // Since if the image format / plugin does not support this feature, imageFormat() will returns an invalid format.
         // So we cannot use imageFormat() and check if it returns QImage::Format_Invalid to detect if we support the file.
diff --git a/app/main.cpp b/app/main.cpp
index 81e4381..5c7554d 100644
--- a/app/main.cpp
+++ b/app/main.cpp
@@ -24,9 +24,6 @@ int main(int argc, char *argv[])
     QGuiApplication::setHighDpiScaleFactorRoundingPolicy(Settings::instance()->hiDpiScaleFactorBehavior());
 
     QApplication a(argc, argv);
-#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
-    a.setAttribute(Qt::ApplicationAttribute::AA_UseHighDpiPixmaps);
-#endif
 
     QTranslator translator;
 #if defined(TRANSLATION_RESOURCE_EMBEDDING)
diff --git a/app/mainwindow.cpp b/app/mainwindow.cpp
index 5dbf2b9..cc0d6ac 100644
--- a/app/mainwindow.cpp
+++ b/app/mainwindow.cpp
@@ -304,7 +304,7 @@ void MainWindow::showEvent(QShowEvent *event)
     return FramelessWindow::showEvent(event);
 }
 
-void MainWindow::enterEvent(QT_ENTER_EVENT *event)
+void MainWindow::enterEvent(QEnterEvent *event)
 {
     m_bottomButtonGroup->setOpacity(1);
     m_gv->setOpacity(1);
@@ -345,11 +345,7 @@ void MainWindow::mouseMoveEvent(QMouseEvent *event)
 {
     if (event->buttons() & Qt::LeftButton && m_clickedOnWindow && !isMaximized() && !isFullScreen()) {
         if (!window()->windowHandle()->startSystemMove()) {
-#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
             move(event->globalPosition().toPoint() - m_oldMousePos);
-#else
-            move(event->globalPos() - m_oldMousePos);
-#endif // QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
         }
         event->accept();
     }
diff --git a/app/mainwindow.h b/app/mainwindow.h
index c9b5a38..45b238a 100644
--- a/app/mainwindow.h
+++ b/app/mainwindow.h
@@ -11,12 +11,6 @@
 #include <QPropertyAnimation>
 #include <QPushButton>
 
-#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
-    typedef QEnterEvent QT_ENTER_EVENT;
-#else
-    typedef QEvent QT_ENTER_EVENT;
-#endif // QT_VERSION_CHECK(6, 0, 0)
-
 QT_BEGIN_NAMESPACE
 class QGraphicsOpacityEffect;
 class QGraphicsView;
@@ -51,7 +45,7 @@ public:
 
 protected slots:
     void showEvent(QShowEvent *event) override;
-    void enterEvent(QT_ENTER_EVENT *event) override;
+    void enterEvent(QEnterEvent *event) override;
     void leaveEvent(QEvent *event) override;
     void mousePressEvent(QMouseEvent *event) override;
     void mouseMoveEvent(QMouseEvent *event) override;
diff --git a/app/shortcutedit.cpp b/app/shortcutedit.cpp
index c86e98f..20486e2 100644
--- a/app/shortcutedit.cpp
+++ b/app/shortcutedit.cpp
@@ -63,9 +63,7 @@ void ShortcutEditor::reloadShortcuts()
     shortcuts.append(QKeySequence());
     for (const QKeySequence & shortcut : shortcuts) {
         QKeySequenceEdit * keyseqEdit = new QKeySequenceEdit(this);
-#if QT_VERSION >= QT_VERSION_CHECK(6, 4, 0)
         keyseqEdit->setClearButtonEnabled(true);
-#endif // QT_VERSION >= QT_VERSION_CHECK(6, 4, 0)
 #if QT_VERSION >= QT_VERSION_CHECK(6, 5, 0)
         keyseqEdit->setMaximumSequenceLength(1);
 #endif // QT_VERSION >= QT_VERSION_CHECK(6, 5, 0)
diff --git a/appveyor.yml b/appveyor.yml
index 571945d..126e3fb 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -12,18 +12,10 @@ environment:
       QTDIR: C:\Qt\6.8\mingw_64
       MINGW64: C:\Qt\Tools\mingw1310_64
       KF_BRANCH: master
-      EXIV2_VERSION: "0.28.3"
+      EXIV2_VERSION: "0.28.5"
       EXIV2_CMAKE_OPTIONS: "-DEXIV2_ENABLE_BROTLI=OFF -DEXIV2_ENABLE_INIH=OFF -DEXIV2_BUILD_EXIV2_COMMAND=OFF"
       PPIC_CMAKE_OPTIONS: "-DPREFER_QT_5=OFF"
       WINDEPLOYQT_ARGS: "--verbose=2 --no-quick-import --no-translations --no-opengl-sw --no-system-d3d-compiler --skip-plugin-types tls,networkinformation"
-    - job_name: mingw81_64_qt5_15_2
-      QTDIR: C:\Qt\5.15.2\mingw81_64
-      MINGW64: C:\Qt\Tools\mingw810_64
-      KF_BRANCH: kf5
-      EXIV2_VERSION: "0.27.7"
-      EXIV2_CMAKE_OPTIONS: "-DEXIV2_BUILD_SAMPLES=OFF -DEXIV2_ENABLE_WIN_UNICODE=ON -DEXIV2_BUILD_EXIV2_COMMAND=OFF"
-      PPIC_CMAKE_OPTIONS: "-DPREFER_QT_5=ON"
-      WINDEPLOYQT_ARGS: "--verbose=2 --no-quick-import --no-translations --no-opengl-sw --no-angle --no-system-d3d-compiler"
 
 install:
   - mkdir %CMAKE_INSTALL_PREFIX%
diff --git a/pineapple-pictures.pro b/pineapple-pictures.pro
index 299ae66..d088f0b 100644
--- a/pineapple-pictures.pro
+++ b/pineapple-pictures.pro
@@ -1,9 +1,8 @@
-# SPDX-FileCopyrightText: 2024 Gary Wang <git@blumia.net>
+# SPDX-FileCopyrightText: 2025 Gary Wang <git@blumia.net>
 #
 # SPDX-License-Identifier: MIT
 
-QT       += core widgets gui svg
-greaterThan(QT_MAJOR_VERSION, 5): QT += svgwidgets
+QT       += core widgets gui svg svgwidgets
 
 TARGET = ppic
 TEMPLATE = app