diff --git a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,7 +4,7 @@
 set(PROJECT_VERSION "5.15.80")
 set(PROJECT_VERSION_MAJOR 5)
 
-set(QT_MIN_VERSION "5.11.0")
+set(QT_MIN_VERSION "5.12.0")
 set(KF5_MIN_VERSION "5.54.0")
 set(INSTALL_SDDM_THEME TRUE)
 find_package(Qt5 ${QT_MIN_VERSION} CONFIG REQUIRED COMPONENTS Widgets Quick QuickWidgets Concurrent Test Network)
diff --git a/logout-greeter/main.cpp b/logout-greeter/main.cpp
--- a/logout-greeter/main.cpp
+++ b/logout-greeter/main.cpp
@@ -34,10 +34,6 @@
 
 int main(int argc, char *argv[])
 {
-    if (QLibraryInfo::version() < QVersionNumber(5, 12)) {
-        // Before Qt 5.12, the xdg-shell v6 integration does not support fullscreen.
-        qputenv("QT_WAYLAND_SHELL_INTEGRATION", "wl-shell");
-    }
     qunsetenv("SESSION_MANAGER");
 
     KWorkSpace::detectPlatform(argc, argv);