diff --git a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -5,7 +5,7 @@
 set(PROJECT_VERSION_MAJOR 5)
 
 set(QT_MIN_VERSION "5.11.0")
-set(KF5_MIN_VERSION "5.54.0")
+set(KF5_MIN_VERSION "5.56.0")
 
 set(CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake/modules ${CMAKE_MODULE_PATH} )
 
diff --git a/helpers/killer/CMakeLists.txt b/helpers/killer/CMakeLists.txt
--- a/helpers/killer/CMakeLists.txt
+++ b/helpers/killer/CMakeLists.txt
@@ -8,7 +8,7 @@
 target_link_libraries(kwin_killer_helper
     Qt5::Widgets
     Qt5::X11Extras
-    KF5::Auth
+    KF5::AuthCore
     KF5::I18n
     KF5::WidgetsAddons
 )