diff --git a/CMakeLists.txt b/CMakeLists.txt
index cf988e5..b12d612 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,96 +1,96 @@
 project(kblackbox)
 
-cmake_minimum_required (VERSION 2.8.12 FATAL_ERROR)
+cmake_minimum_required (VERSION 3.5 FATAL_ERROR)
 set (QT_MIN_VERSION "5.7.0")
 set (KF5_MIN_VERSION "5.30.0")
 
 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 Svg)
 find_package(KF5 ${KF5_MIN_VERSION} REQUIRED COMPONENTS
     Archive
     CoreAddons
     Config
     Crash
     DocTools
     I18n
     DBusAddons
     TextWidgets
     XmlGui
 )
 
 find_package(KF5KDEGames 4.9.0 REQUIRED)
 
 include(FeatureSummary)
 include(ECMInstallIcons)
 include(KDEInstallDirs)
 include(KDECompilerSettings NO_POLICY_SCOPE)
 include(KDECMakeSettings)
 include(ECMAddAppIcon)
 
 add_definitions(
     -DQT_USE_FAST_CONCATENATION
     -DQT_USE_FAST_OPERATOR_PLUS
     -DQT_NO_CAST_FROM_ASCII
     -DQT_NO_CAST_TO_ASCII
     -DQT_NO_CAST_FROM_BYTEARRAY
     -DQT_NO_URL_CAST_FROM_STRING
     -DQT_USE_QSTRINGBUILDER
 )
 
 add_subdirectory(pics)
 add_subdirectory(doc)
 
 set(kblackbox_SRCS
     kbbballsonboard.cpp
     kbbgamedoc.cpp
     kbbgraphicsitem.cpp
     kbbgraphicsitemball.cpp
     kbbgraphicsitemballrepository.cpp
     kbbgraphicsitemblackbox.cpp
     kbbgraphicsitemborder.cpp
     kbbgraphicsitemcursor.cpp
     kbbgraphicsiteminteractioninfo.cpp
     kbbgraphicsitemlaser.cpp
     kbbgraphicsitemonbox.cpp
     kbbgraphicsitemray.cpp
     kbbgraphicsitemrayresult.cpp
     kbbgraphicsitemset.cpp
     kbbgraphicsitemtutorialmarker.cpp
     kbbitemwithposition.cpp
     kbblevelconfigurationpreview.cpp
     kbblevelconfigurationwidget.cpp
     kbbmainwindow.cpp
     kbbscalablegraphicwidget.cpp
     kbbthememanager.cpp
     kbbtutorial.cpp
     main.cpp
 )
 
 kconfig_add_kcfg_files(kblackbox_SRCS kbbprefs.kcfgc)
 
 file(GLOB ICONS_SRCS "${CMAKE_CURRENT_SOURCE_DIR}/*-apps-kblackbox.png")
 ecm_add_app_icon(kblackbox_SRCS ICONS ${ICONS_SRCS})
 add_executable(kblackbox ${kblackbox_SRCS})
 target_link_libraries(kblackbox
     Qt5::Xml
     KF5KDEGames
     KF5::XmlGui
     Qt5::Svg
     KF5::I18n
     KF5::Archive
     KF5::TextWidgets
     KF5::DBusAddons
     KF5::Crash
 )
 
 
 install(TARGETS kblackbox  ${KDE_INSTALL_TARGETS_DEFAULT_ARGS})
 install(PROGRAMS org.kde.kblackbox.desktop  DESTINATION  ${KDE_INSTALL_APPDIR})
 install(FILES org.kde.kblackbox.appdata.xml  DESTINATION  ${KDE_INSTALL_METAINFODIR})
 install(FILES kblackboxui.rc  DESTINATION  ${KDE_INSTALL_KXMLGUI5DIR}/kblackbox)
 
 ecm_install_icons(ICONS 128-apps-kblackbox.png  16-apps-kblackbox.png  22-apps-kblackbox.png  32-apps-kblackbox.png  48-apps-kblackbox.png  64-apps-kblackbox.png DESTINATION ${KDE_INSTALL_ICONDIR} THEME hicolor)
 
 feature_summary(WHAT ALL INCLUDE_QUIET_PACKAGES FATAL_ON_MISSING_REQUIRED_PACKAGES)