--- a/CMakeLists.txt	2021-10-12 00:47:46.000000000 +0200
+++ b/CMakeLists.txt	2026-04-24 19:18:05.736237146 +0200
@@ -146,8 +146,8 @@
 
 # find Qt modules, if building GUI
 if (PRISMATIC_ENABLE_GUI)
-    find_package(Qt5Widgets REQUIRED)
-    message(Qt5Widgets_DIR = ${Qt5Widgets_DIR})
+    find_package(Qt6 REQUIRED COMPONENTS Widgets)
+    message(Qt6Widgets_DIR = ${Qt6Widgets_DIR})
 endif (PRISMATIC_ENABLE_GUI)
 
 # add preprocessor directives based on configuration
@@ -212,7 +212,7 @@
     set(CMAKE_AUTORCC ON)
     set(CMAKE_INCLUDE_CURRENT_DIR on)
     include_directories(${CMAKE_SOURCE_DIR}/Qt ${CMAKE_SOURCE_DIR}/include)
-    include_directories(${Qt5Widgets_INCLUDE_DIRS})
+    include_directories(${Qt6Widgets_INCLUDE_DIRS})
 
     if (PRISMATIC_ENABLE_GPU)
         # build the shared CUDA library used by the GUI
@@ -235,7 +235,7 @@
                                 ${CUDA_SOURCE_FILES}
 				OPTIONS -DPRISMATIC_BUILDING_GUI)
         target_link_libraries(prismatic-gui
-                                Qt5::Widgets
+                                Qt6::Widgets
                                 ${CMAKE_THREAD_LIBS_INIT}
 #                                ${Boost_LIBRARY_DIRS}
                                 ${FFTW_LIBRARIES}
@@ -247,7 +247,7 @@
                         ${SOURCE_FILES}
                         ${GUI_SOURCE_FILES})
         target_link_libraries(prismatic-gui
-                                Qt5::Widgets
+                                Qt6::Widgets
                                 ${CMAKE_THREAD_LIBS_INIT}
 #                                ${Boost_LIBRARY_DIRS}
                                 ${FFTW_LIBRARIES}