diff --git a/CMakeLists.txt b/CMakeLists.txt
index 376e6cc60c5..d70dab026ce 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -70,37 +70,23 @@ find_package(Qt5
   COMPONENTS Concurrent Core Gui Network PrintSupport Qml Sql Widgets Xml Core5Compat ${QT_TEST_COMPONENT}
   REQUIRED
 )
-if (Qt5_VERSION VERSION_LESS 6.0.0)
-  install(TARGETS Qt6Core5Compat EXPORT QtCreator)
 
-  # Specify standards conformance mode to MSVC 2017 and later
-  # Qt6 has the values as part of the Qt6::Platform target interface
-  if (MSVC AND MSVC_VERSION GREATER_EQUAL 1910)
-    add_compile_options(/permissive- /Zc:__cplusplus)
-  endif()
-  if (CMAKE_CXX_COMPILER_ID STREQUAL GNU)
-    add_compile_options(-Wno-missing-field-initializers)
-  endif()
-else()
-  # Common intermediate directory for QML modules which are defined via qt_add_qml_module()
-  set(QT_QML_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/qml_modules")
+# Common intermediate directory for QML modules which are defined via qt_add_qml_module()
+set(QT_QML_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/qml_modules")
 
-  # This includes the code that will enable higher compiler warnings level (/W3 for MSVC, -Wall -Wextra for GCC)
-  # This is controlled by QT_COMPILE_OPTIONS_DISABLE_WARNINGS target property.
-  include(QtCompilerFlags)
+# This includes the code that will enable higher compiler warnings level (/W3 for MSVC, -Wall -Wextra for GCC)
+# This is controlled by QT_COMPILE_OPTIONS_DISABLE_WARNINGS target property.
+include(QtCompilerFlags)
 
-  if (MSVC AND QT_FEATURE_static_runtime)
-    set(CMAKE_MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>")
-  endif()
+if (MSVC AND QT_FEATURE_static_runtime)
+  set(CMAKE_MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>")
 endif()
+
 find_package(Qt5 COMPONENTS LinguistTools QUIET)
 find_package(Qt5 COMPONENTS Quick QuickWidgets Designer DesignerComponents Help SerialPort Svg Tools QUIET)
 
 find_package(Threads)
 find_package(Clang QUIET)
-if (Qt5_VERSION VERSION_LESS 6.0.0)
-  find_package(KF5SyntaxHighlighting QUIET)
-endif()
 
 # Crashpad
 set(CRASHPAD_BACKEND_URL "" CACHE STRING "Crashpad backend URL")
diff --git a/cmake/QtCreatorAPI.cmake b/cmake/QtCreatorAPI.cmake
index 87edde968c1..304ebaabfbb 100644
--- a/cmake/QtCreatorAPI.cmake
+++ b/cmake/QtCreatorAPI.cmake
@@ -304,7 +304,8 @@ function(add_qtc_library name)
   endif()
 
   get_target_property(have_automoc_prop ${name} AUTOMOC)
-  if("${Qt5_VERSION}" VERSION_GREATER_EQUAL "6.2.0" AND "${have_automoc_prop}")
+  # check for Qt 6 is needed because sdktool & qml2puppet still build with Qt 5
+  if(Qt6_VERSION AND "${have_automoc_prop}")
     qt_extract_metatypes(${name})
   endif()
 endfunction(add_qtc_library)
diff --git a/src/app/CMakeLists.txt b/src/app/CMakeLists.txt
index a7090e2d95a..940ae30a596 100644
--- a/src/app/CMakeLists.txt
+++ b/src/app/CMakeLists.txt
@@ -66,7 +66,7 @@ if (QTC_STATIC_BUILD)
     SOURCES "${CMAKE_CURRENT_BINARY_DIR}/plugin_imports.cpp"
   )
 
-  if (Qt5_VERSION VERSION_GREATER_EQUAL 6.0.0 AND TARGET QmlDesigner)
+  if (TARGET QmlDesigner)
     qt6_import_qml_plugins(qtcreator
       PATH_TO_SCAN "${CMAKE_CURRENT_SOURCE_DIR}/../../share/qtcreator/qmldesigner")
   endif()
diff --git a/src/libs/CMakeLists.txt b/src/libs/CMakeLists.txt
index 0f2b3409398..fc6b53d81c4 100644
--- a/src/libs/CMakeLists.txt
+++ b/src/libs/CMakeLists.txt
@@ -34,7 +34,7 @@ if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/qlitehtml/src/CMakeLists.txt)
       set(QLITEHTML_BIN_PATH ${IDE_BIN_PATH})
       set(QLITEHTML_LIBRARY_PATH ${IDE_LIBRARY_PATH})
     endif()
-    set(QT_VERSION_MAJOR ${Qt5_VERSION_MAJOR})
+    set(QT_VERSION_MAJOR ${Qt6_VERSION_MAJOR})
     option(BUILD_TESTING "Build litehtml tests" OFF) # otherwise litehtml downloads googletest
     add_subdirectory(qlitehtml/src)
   endif()
diff --git a/src/libs/sqlite/CMakeLists.txt b/src/libs/sqlite/CMakeLists.txt
index 0b23a7db126..6f5b165af17 100644
--- a/src/libs/sqlite/CMakeLists.txt
+++ b/src/libs/sqlite/CMakeLists.txt
@@ -1,6 +1,5 @@
 add_qtc_library(SqliteC OBJECT
     PROPERTIES AUTOMOC OFF AUTOUIC OFF QT_COMPILE_OPTIONS_DISABLE_WARNINGS ON POSITION_INDEPENDENT_CODE ON
-    CONDITION Qt5_VERSION VERSION_GREATER_EQUAL 6.2.0
     DEFINES SQLITE_CORE SQLITE_CUSTOM_INCLUDE=config.h $<$<CONFIG:Debug>:SQLITE_DEBUG>
     PROPERTIES COMPILE_OPTIONS $<IF:$<CXX_COMPILER_ID:MSVC>,/FIconfig.h,-includeconfig.h>
     PUBLIC_INCLUDES
@@ -18,7 +17,6 @@ add_qtc_library(SqliteC OBJECT
 add_qtc_library(Sqlite
   PROPERTIES AUTOMOC OFF AUTOUIC OFF
   DEPENDS Qt::Core Threads::Threads ${CMAKE_DL_LIBS} SqliteC
-  CONDITION Qt5_VERSION VERSION_GREATER_EQUAL 6.2.0
   PUBLIC_INCLUDES
     "${CMAKE_CURRENT_LIST_DIR}"
   DEFINES SQLITE_CUSTOM_INCLUDE=config.h $<$<CONFIG:Debug>:SQLITE_REVERSE>
diff --git a/src/plugins/coreplugin/CMakeLists.txt b/src/plugins/coreplugin/CMakeLists.txt
index a63c25311d0..8a680a0f7bd 100644
--- a/src/plugins/coreplugin/CMakeLists.txt
+++ b/src/plugins/coreplugin/CMakeLists.txt
@@ -207,15 +207,9 @@ if ((NOT WIN32) AND (NOT APPLE))
 endif()
 
 set(FONTS_BASE "${QtCreator_SOURCE_DIR}/src/share/3rdparty/studiofonts/")
-if(${Qt5_VERSION} VERSION_LESS "6")
-extend_qtc_plugin(Core
-  SOURCES "${FONTS_BASE}/studiofonts.qrc"
-)
-else() # < Qt 6
 qt_add_resources(Core
   CoreWelcomeScreenFonts_rcc
   BASE ${FONTS_BASE}
   PREFIX "studiofonts"
   FILES "${FONTS_BASE}/TitilliumWeb-Regular.ttf"
 )
-endif()
diff --git a/src/plugins/qmldesigner/CMakeLists.txt b/src/plugins/qmldesigner/CMakeLists.txt
index 40bc1dfa064..b693de0c587 100644
--- a/src/plugins/qmldesigner/CMakeLists.txt
+++ b/src/plugins/qmldesigner/CMakeLists.txt
@@ -1,5 +1,5 @@
 add_qtc_plugin(QmlDesigner
-  CONDITION Qt5_VERSION VERSION_GREATER_EQUAL 6.2.0 AND TARGET Qt::QuickWidgets AND TARGET Qt::Svg
+  CONDITION TARGET Qt::QuickWidgets AND TARGET Qt::Svg
   DEPENDS
     QmlJS LanguageUtils QmlEditorWidgets AdvancedDockingSystem
     Qt::QuickWidgets Qt::CorePrivate Sqlite Qt::Xml Qt::Svg
@@ -498,7 +498,7 @@ function(get_and_add_as_subdirectory name repository git_tag build_dir source_di
 endfunction()
 
 if (WITH_QMLDOM)
-  if (Qt5_VERSION VERSION_LESS 6.3.2)
+  if (Qt6_VERSION VERSION_LESS 6.3.2)
     message(FATAL_ERROR "You need Qt 6.3.2 or newer to enable WITH_QMLDOM feature.")
   endif()
 
diff --git a/src/plugins/qmlpreview/CMakeLists.txt b/src/plugins/qmlpreview/CMakeLists.txt
index 438068e19b0..40114a7e47c 100644
--- a/src/plugins/qmlpreview/CMakeLists.txt
+++ b/src/plugins/qmlpreview/CMakeLists.txt
@@ -23,13 +23,9 @@ extend_qtc_plugin(QmlPreview
     tests/qmlpreviewplugin_test.cpp tests/qmlpreviewplugin_test.h
 )
 
-if(TARGET Qt${QT_VERSION_MAJOR}::QmlPrivate)
-  # check if Qt version have_qml_debug_translation_protocol
-  # will be introduced in Qt 6.2, but there are users
-  # who needs it in older but special built Qt versions aswell
-  string(REGEX MATCH "^[0-9]*" QT_VERSION_MAJOR ${Qt5_VERSION})
+if(TARGET Qt6::QmlPrivate)
   get_target_property(qmldebugprivate_include_directories
-                      Qt${QT_VERSION_MAJOR}::QmlPrivate
+                      Qt6::QmlPrivate
                       INTERFACE_INCLUDE_DIRECTORIES
   )
   find_file(have_qml_debug_translation_protocol
diff --git a/tests/auto/qml/qmldesigner/CMakeLists.txt b/tests/auto/qml/qmldesigner/CMakeLists.txt
index 5792c8bd261..cf8d848b073 100644
--- a/tests/auto/qml/qmldesigner/CMakeLists.txt
+++ b/tests/auto/qml/qmldesigner/CMakeLists.txt
@@ -1,4 +1,2 @@
-if (${Qt5_VERSION} VERSION_GREATER_EQUAL "6.2.0")
-  add_subdirectory(coretests)
-  add_subdirectory(wizard)
-endif()
+add_subdirectory(coretests)
+add_subdirectory(wizard)
diff --git a/tests/auto/qml/qmldesigner/coretests/CMakeLists.txt b/tests/auto/qml/qmldesigner/coretests/CMakeLists.txt
index e1e73dd0ebb..e80627a00e1 100644
--- a/tests/auto/qml/qmldesigner/coretests/CMakeLists.txt
+++ b/tests/auto/qml/qmldesigner/coretests/CMakeLists.txt
@@ -1,6 +1,6 @@
 add_qtc_test(tst_qml_testcore
   EXCLUDE_FROM_PRECHECK
-  CONDITION TARGET QmlProjectManager AND Qt5_VERSION VERSION_GREATER_EQUAL 6.2.0
+  CONDITION TARGET QmlProjectManager
   DEPENDS
     Sqlite
     QmlDesignerCore
diff --git a/tests/auto/utils/qtcprocess/CMakeLists.txt b/tests/auto/utils/qtcprocess/CMakeLists.txt
index 7e9d1119ccc..51720bbeb5b 100644
--- a/tests/auto/utils/qtcprocess/CMakeLists.txt
+++ b/tests/auto/utils/qtcprocess/CMakeLists.txt
@@ -4,7 +4,6 @@ file(RELATIVE_PATH RELATIVE_TEST_PATH "${PROJECT_BINARY_DIR}" "${CMAKE_CURRENT_B
 file(RELATIVE_PATH TEST_RELATIVE_LIBEXEC_PATH "/${RELATIVE_TEST_PATH}" "/${IDE_LIBEXEC_PATH}")
 
 add_qtc_test(tst_qtcprocess
-  CONDITION Qt5_VERSION VERSION_GREATER_EQUAL 6.2.0
   DEFINES "TEST_RELATIVE_LIBEXEC_PATH=\"${TEST_RELATIVE_LIBEXEC_PATH}\""
           "PROCESS_TESTAPP=\"${CMAKE_CURRENT_BINARY_DIR}/processtestapp\""
   DEPENDS Utils app_version
diff --git a/tests/unit/unittest/CMakeLists.txt b/tests/unit/unittest/CMakeLists.txt
index f92016fc32e..fd73f4cb124 100644
--- a/tests/unit/unittest/CMakeLists.txt
+++ b/tests/unit/unittest/CMakeLists.txt
@@ -26,7 +26,6 @@ add_qtc_test(unittest GTEST
     Qt::Xml Qt::Concurrent Qt::Qml Qt::Gui
     Qt6Core5Compat QmlJS Sqlite SqliteC
     Googletest
-  CONDITION Qt5_VERSION VERSION_GREATER_EQUAL 6.2.0
   DEFINES
     QT_NO_CAST_TO_ASCII
     QT_RESTRICTED_CAST_FROM_ASCII