diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1f3158d..3978f66 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,88 +1,88 @@
 project(klines)
 
-cmake_minimum_required (VERSION 2.8.12 FATAL_ERROR)
+cmake_minimum_required (VERSION 3.5 FATAL_ERROR)
 set (QT_MIN_VERSION "5.9.0")
 set (KF5_MIN_VERSION "5.46.0")
 
 find_package(ECM ${KF5_MIN_VERSION} REQUIRED CONFIG)
 set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${ECM_MODULE_PATH} ${ECM_KDE_MODULE_DIR})
 
 find_package(Qt5 ${QT_MIN_VERSION} REQUIRED NO_MODULE COMPONENTS Widgets)
 find_package(KF5 ${KF5_MIN_VERSION} REQUIRED COMPONENTS
     CoreAddons
     Config
     Crash
     WidgetsAddons
     Config
     DBusAddons
     I18n
     ConfigWidgets
     XmlGui
     DocTools
 )
     
 find_package(KF5KDEGames 4.9.0 REQUIRED)
 
 include(FeatureSummary)
 include(ECMAddAppIcon)
 include(ECMInstallIcons)
 include(KDEInstallDirs)
 include(KDEFrameworkCompilerSettings NO_POLICY_SCOPE)
 include(KDECMakeSettings)
 # workaround for https://bugreports.qt.io/browse/QTBUG-74665 (bug in qt5.13 reevaluate it)
 if (${Qt5Widgets_VERSION} STREQUAL "5.13.0")
    MESSAGE(STATUS "Qt version: ${Qt5Widgets_VERSION} DISABLE compile without deprecated methods. bug QTBUG-74665")
 else()
    add_definitions(-DQT_DISABLE_DEPRECATED_BEFORE=0x060000)
 endif()
 
 add_subdirectory(themes)
 add_subdirectory(doc)
 
 ########### next target ###############
 
 set(klines_SRCS 
    mwidget.cpp 
    klines.cpp 
    main.cpp
    scene.cpp
    renderer.cpp
    ballitem.cpp
    previewitem.cpp
    animator.cpp
 )
    
 qt5_add_resources(klines_SRCS klines.qrc)
 kconfig_add_kcfg_files(klines_SRCS prefs.kcfgc)
 file(GLOB ICONS_SRCS "${CMAKE_CURRENT_SOURCE_DIR}/*-apps-klines.png")
 ecm_add_app_icon(klines_SRCS ICONS ${ICONS_SRCS})
 add_executable(klines ${klines_SRCS})
 
 target_link_libraries(klines
     KF5KDEGames
     KF5::Crash
     KF5::DBusAddons
     KF5::XmlGui
 )
 
 install(TARGETS klines  ${KDE_INSTALL_TARGETS_DEFAULT_ARGS})
 
 
 ########### install files ###############
 
 install(PROGRAMS org.kde.klines.desktop  DESTINATION  ${KDE_INSTALL_APPDIR})
 install(FILES klines.kcfg  DESTINATION  ${KDE_INSTALL_KCFGDIR})
 install(FILES org.kde.klines.appdata.xml DESTINATION ${CMAKE_INSTALL_METAINFODIR})
 
 ecm_install_icons(ICONS
     16-apps-klines.png
     22-apps-klines.png
     32-apps-klines.png
     48-apps-klines.png
     64-apps-klines.png
     128-apps-klines.png
     DESTINATION ${KDE_INSTALL_ICONDIR}
     THEME hicolor
 )
 
 feature_summary(WHAT ALL INCLUDE_QUIET_PACKAGES FATAL_ON_MISSING_REQUIRED_PACKAGES)