diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7065538..1946574 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -19,14 +19,8 @@ set(EXECUTABLE_OUTPUT_PATH "${PROJECT_BINARY_DIR}")
 set(VS_STARTUP_PROJECT ${EXECUTABLE_NAME})
 
 # Configure options
-if (WIN32 OR APPLE)
-  set(QT_VERSION "6")
-else ()
-  set(QT_VERSION "5" CACHE STRING "Qt major version to use (5 or 6).")
-  if (NOT (QT_VERSION STREQUAL "5" OR QT_VERSION STREQUAL "6"))
-    message(FATAL_ERROR "Unsupported Qt version '${QT_VERSION}'. Only 5 and 6 are supported")
-  endif ()
-endif ()
+set(QT_VERSION "6")
+
 if (APPLE)
   option(DMG "Make deployable DMG" OFF)
 endif ()