diff --git a/YACReader/CMakeLists.txt b/YACReader/CMakeLists.txt
index e6f74b0a..a6fcded6 100644
--- a/YACReader/CMakeLists.txt
+++ b/YACReader/CMakeLists.txt
@@ -232,15 +232,15 @@ qt_add_translations(YACReader
 )
 
 target_link_libraries(YACReader PRIVATE
-    Qt::Core
-    Qt::Gui
-    Qt::GuiPrivate
-    Qt::Network
-    Qt::Widgets
-    Qt::Multimedia
-    Qt::TextToSpeech
-    Qt::Svg
-    Qt::Core5Compat
+    Qt6::Core
+    Qt6::Gui
+    Qt6::GuiPrivate
+    Qt6::Network
+    Qt6::Widgets
+    Qt6::Multimedia
+    Qt6::TextToSpeech
+    Qt6::Svg
+    Qt6::Core5Compat
     comic_backend
     common_gui
     rhi_flow_reader
diff --git a/YACReaderLibrary/CMakeLists.txt b/YACReaderLibrary/CMakeLists.txt
index ef562b5e..d8586d48 100644
--- a/YACReaderLibrary/CMakeLists.txt
+++ b/YACReaderLibrary/CMakeLists.txt
@@ -32,10 +32,10 @@ target_include_directories(library_common PUBLIC
     ${CMAKE_CURRENT_SOURCE_DIR}/db
 )
 target_link_libraries(library_common PUBLIC
-    Qt::Core
-    Qt::Core5Compat
-    Qt::Network
-    Qt::Sql
+    Qt6::Core
+    Qt6::Core5Compat
+    Qt6::Network
+    Qt6::Sql
     common_all
     comic_backend
     cbx_backend
@@ -63,14 +63,14 @@ target_include_directories(db_helper PUBLIC
     ${CMAKE_CURRENT_SOURCE_DIR}/db
 )
 target_link_libraries(db_helper PUBLIC
-    Qt::Core
-    Qt::Sql
+    Qt6::Core
+    Qt6::Sql
     common_all
     QsLog
 )
 
 # When BUILD_SERVER_STANDALONE=ON, only library_common and db_helper are built.
-# The full YACReaderLibrary GUI app requires Qt::Widgets and other full-build components.
+# The full YACReaderLibrary GUI app requires Qt6::Widgets and other full-build components.
 if(NOT BUILD_SERVER_STANDALONE)
 
 # --- YACReaderLibrary executable ---
@@ -476,18 +476,18 @@ qt_add_translations(YACReaderLibrary
 )
 
 target_link_libraries(YACReaderLibrary PRIVATE
-    Qt::Core
-    Qt::Gui
-    Qt::GuiPrivate
-    Qt::Network
-    Qt::Widgets
-    Qt::Sql
-    Qt::Svg
-    Qt::Quick
-    Qt::Qml
-    Qt::QuickWidgets
-    Qt::QuickControls2
-    Qt::Core5Compat
+    Qt6::Core
+    Qt6::Gui
+    Qt6::GuiPrivate
+    Qt6::Network
+    Qt6::Widgets
+    Qt6::Sql
+    Qt6::Svg
+    Qt6::Quick
+    Qt6::Qml
+    Qt6::QuickWidgets
+    Qt6::QuickControls2
+    Qt6::Core5Compat
     library_common
     db_helper
     comic_backend
diff --git a/YACReaderLibrary/comic_vine/CMakeLists.txt b/YACReaderLibrary/comic_vine/CMakeLists.txt
index cc0ca1a1..947d01b6 100644
--- a/YACReaderLibrary/comic_vine/CMakeLists.txt
+++ b/YACReaderLibrary/comic_vine/CMakeLists.txt
@@ -60,9 +60,9 @@ target_include_directories(comic_vine PRIVATE
     ${PROJECT_SOURCE_DIR}/YACReaderLibrary/db
 )
 target_link_libraries(comic_vine PUBLIC
-    Qt::Core
-    Qt::Widgets
-    Qt::Network
+    Qt6::Core
+    Qt6::Widgets
+    Qt6::Network
     common_all
     common_gui
     custom_widgets_library
diff --git a/YACReaderLibrary/server/CMakeLists.txt b/YACReaderLibrary/server/CMakeLists.txt
index 5a78620c..af7b337e 100644
--- a/YACReaderLibrary/server/CMakeLists.txt
+++ b/YACReaderLibrary/server/CMakeLists.txt
@@ -73,9 +73,9 @@ if(UNIX AND NOT APPLE)
         "DATADIR=\"${CMAKE_INSTALL_FULL_DATADIR}\"")
 endif()
 target_link_libraries(server PUBLIC
-    Qt::Core
-    Qt::Network
-    Qt::Sql
+    Qt6::Core
+    Qt6::Network
+    Qt6::Sql
     QtWebApp_httpserver
     QtWebApp_templateengine
     QsLog
diff --git a/YACReaderLibraryServer/CMakeLists.txt b/YACReaderLibraryServer/CMakeLists.txt
index 42b5a27b..efaf364a 100644
--- a/YACReaderLibraryServer/CMakeLists.txt
+++ b/YACReaderLibraryServer/CMakeLists.txt
@@ -36,10 +36,10 @@ qt_add_translations(YACReaderLibraryServer
 )
 
 target_link_libraries(YACReaderLibraryServer PRIVATE
-    Qt::Core
-    Qt::Network
-    Qt::Sql
-    Qt::Core5Compat
+    Qt6::Core
+    Qt6::Network
+    Qt6::Sql
+    Qt6::Core5Compat
     library_common
     db_helper
     comic_backend
diff --git a/common/CMakeLists.txt b/common/CMakeLists.txt
index 96125dd6..d8017a65 100644
--- a/common/CMakeLists.txt
+++ b/common/CMakeLists.txt
@@ -18,7 +18,7 @@ target_include_directories(yr_global PUBLIC
     ${CMAKE_CURRENT_SOURCE_DIR}
     ${CMAKE_CURRENT_BINARY_DIR}
 )
-target_link_libraries(yr_global PUBLIC Qt::Core)
+target_link_libraries(yr_global PUBLIC Qt6::Core)
 if(UNIX AND NOT APPLE)
     target_compile_definitions(yr_global PRIVATE
         "LIBDIR=\"${CMAKE_INSTALL_FULL_LIBDIR}\"")
@@ -30,7 +30,7 @@ add_library(naturalsort STATIC
     qnaturalsorting.cpp
 )
 target_include_directories(naturalsort PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
-target_link_libraries(naturalsort PUBLIC Qt::Core)
+target_link_libraries(naturalsort PUBLIC Qt6::Core)
 
 # --- concurrent_queue ---
 add_library(concurrent_queue STATIC
@@ -38,7 +38,7 @@ add_library(concurrent_queue STATIC
     concurrent_queue.cpp
 )
 target_include_directories(concurrent_queue PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
-target_link_libraries(concurrent_queue PUBLIC Qt::Core)
+target_link_libraries(concurrent_queue PUBLIC Qt6::Core)
 
 # --- worker (header-only thread helpers) ---
 add_library(worker INTERFACE)
@@ -67,10 +67,10 @@ add_library(common_all STATIC
 )
 target_include_directories(common_all PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
 target_link_libraries(common_all PUBLIC
-    Qt::Core
-    Qt::Gui
-    Qt::Sql
-    Qt::Network
+    Qt6::Core
+    Qt6::Gui
+    Qt6::Sql
+    Qt6::Network
     yr_global
     naturalsort
     pdf_backend_iface
@@ -92,8 +92,8 @@ endif()
 
 target_include_directories(comic_backend PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
 target_link_libraries(comic_backend PUBLIC
-    Qt::Core
-    Qt::Gui
+    Qt6::Core
+    Qt6::Gui
     common_all
     pdf_backend_iface
     cbx_backend
@@ -101,7 +101,7 @@ target_link_libraries(comic_backend PUBLIC
 )
 
 # GUI-only targets: not needed for server-standalone builds (Qt 6.4+) which
-# lack Qt::Widgets, Qt::ShaderTools, Qt::GuiPrivate, etc.
+# lack Qt6::Widgets, Qt6::ShaderTools, Qt6::GuiPrivate, etc.
 if(NOT BUILD_SERVER_STANDALONE)
 
 # --- common_gui (GUI-only code: widgets, version check, themes infrastructure) ---
@@ -146,11 +146,11 @@ target_include_directories(common_gui PUBLIC
 )
 
 target_link_libraries(common_gui PUBLIC
-    Qt::Core
-    Qt::Core5Compat
-    Qt::Widgets
-    Qt::Network
-    Qt::Svg
+    Qt6::Core
+    Qt6::Core5Compat
+    Qt6::Widgets
+    Qt6::Network
+    Qt6::Svg
     common_all
     yr_global
     QsLog
@@ -178,10 +178,10 @@ target_include_directories(rhi_flow_reader PUBLIC
 )
 target_compile_definitions(rhi_flow_reader PRIVATE YACREADER)
 target_link_libraries(rhi_flow_reader PUBLIC
-    Qt::Core
-    Qt::Gui
-    Qt::GuiPrivate
-    Qt::Widgets
+    Qt6::Core
+    Qt6::Gui
+    Qt6::GuiPrivate
+    Qt6::Widgets
     yr_global
 )
 qt_add_shaders(rhi_flow_reader "flow_shaders_reader"
@@ -202,10 +202,10 @@ target_include_directories(rhi_flow_library PUBLIC
 )
 target_compile_definitions(rhi_flow_library PRIVATE YACREADER_LIBRARY)
 target_link_libraries(rhi_flow_library PUBLIC
-    Qt::Core
-    Qt::Gui
-    Qt::GuiPrivate
-    Qt::Widgets
+    Qt6::Core
+    Qt6::Gui
+    Qt6::GuiPrivate
+    Qt6::Widgets
     yr_global
 )
 qt_add_shaders(rhi_flow_library "flow_shaders_library"
diff --git a/compressed_archive/CMakeLists.txt b/compressed_archive/CMakeLists.txt
index 928fb622..a5f5ba5c 100644
--- a/compressed_archive/CMakeLists.txt
+++ b/compressed_archive/CMakeLists.txt
@@ -125,4 +125,4 @@ else()
 endif()
 
 # Qt, yr_global, and QsLog are needed by all backends
-target_link_libraries(cbx_backend PRIVATE Qt::Core yr_global QsLog)
+target_link_libraries(cbx_backend PRIVATE Qt6::Core yr_global QsLog)
diff --git a/custom_widgets/CMakeLists.txt b/custom_widgets/CMakeLists.txt
index aaa7ec25..84590dad 100644
--- a/custom_widgets/CMakeLists.txt
+++ b/custom_widgets/CMakeLists.txt
@@ -44,9 +44,9 @@ target_include_directories(custom_widgets_reader PRIVATE
 )
 target_compile_definitions(custom_widgets_reader PRIVATE YACREADER)
 target_link_libraries(custom_widgets_reader PUBLIC
-    Qt::Core
-    Qt::Widgets
-    Qt::Network
+    Qt6::Core
+    Qt6::Widgets
+    Qt6::Network
     common_gui
     rhi_flow_reader
     QsLog
@@ -91,9 +91,9 @@ target_include_directories(custom_widgets_library PRIVATE
 )
 target_compile_definitions(custom_widgets_library PRIVATE YACREADER_LIBRARY)
 target_link_libraries(custom_widgets_library PUBLIC
-    Qt::Core
-    Qt::Widgets
-    Qt::Network
+    Qt6::Core
+    Qt6::Widgets
+    Qt6::Network
     common_gui
     rhi_flow_library
     QsLog
diff --git a/shortcuts_management/CMakeLists.txt b/shortcuts_management/CMakeLists.txt
index 4cbbd721..3c893d06 100644
--- a/shortcuts_management/CMakeLists.txt
+++ b/shortcuts_management/CMakeLists.txt
@@ -22,7 +22,7 @@ target_include_directories(shortcuts_reader PRIVATE
     ${PROJECT_SOURCE_DIR}/YACReader/themes
 )
 target_compile_definitions(shortcuts_reader PRIVATE YACREADER)
-target_link_libraries(shortcuts_reader PUBLIC Qt::Core Qt::Widgets yr_global common_gui)
+target_link_libraries(shortcuts_reader PUBLIC Qt6::Core Qt6::Widgets yr_global common_gui)
 
 # --- shortcuts_library (YACREADER_LIBRARY define) ---
 add_library(shortcuts_library STATIC ${SHORTCUTS_SOURCES})
@@ -31,4 +31,4 @@ target_include_directories(shortcuts_library PRIVATE
     ${PROJECT_SOURCE_DIR}/YACReaderLibrary/themes
 )
 target_compile_definitions(shortcuts_library PRIVATE YACREADER_LIBRARY)
-target_link_libraries(shortcuts_library PUBLIC Qt::Core Qt::Widgets yr_global common_gui)
+target_link_libraries(shortcuts_library PUBLIC Qt6::Core Qt6::Widgets yr_global common_gui)
diff --git a/tests/compressed_archive_test/CMakeLists.txt b/tests/compressed_archive_test/CMakeLists.txt
index 7b3e40b0..4f0e1c47 100644
--- a/tests/compressed_archive_test/CMakeLists.txt
+++ b/tests/compressed_archive_test/CMakeLists.txt
@@ -4,7 +4,7 @@ qt_add_executable(compressed_archive_test
     main.cpp
 )
 target_link_libraries(compressed_archive_test PRIVATE
-    Qt::Core
+    Qt6::Core
     cbx_backend
 )
 if(WIN32)
diff --git a/tests/concurrent_queue_test/CMakeLists.txt b/tests/concurrent_queue_test/CMakeLists.txt
index b6c49093..380e52b5 100644
--- a/tests/concurrent_queue_test/CMakeLists.txt
+++ b/tests/concurrent_queue_test/CMakeLists.txt
@@ -4,8 +4,8 @@ qt_add_executable(concurrent_queue_test
     concurrent_queue_test.cpp
 )
 target_link_libraries(concurrent_queue_test PRIVATE
-    Qt::Core
-    Qt::Test
+    Qt6::Core
+    Qt6::Test
     concurrent_queue
 )
 add_test(NAME concurrent_queue_test
diff --git a/third_party/CMakeLists.txt b/third_party/CMakeLists.txt
index d4804f55..512e5745 100644
--- a/third_party/CMakeLists.txt
+++ b/third_party/CMakeLists.txt
@@ -21,7 +21,7 @@ add_library(QsLog STATIC
 )
 target_include_directories(QsLog PUBLIC QsLog)
 target_compile_definitions(QsLog PUBLIC QS_LOG_SEPARATE_THREAD)
-target_link_libraries(QsLog PUBLIC Qt::Core)
+target_link_libraries(QsLog PUBLIC Qt6::Core)
 
 # --- QrCode (QR code generation, no Qt dependency) ---
 add_library(QrCode STATIC
@@ -56,7 +56,7 @@ add_library(QtWebApp_httpserver STATIC
     QtWebApp/httpserver/staticfilecontroller.h
 )
 target_include_directories(QtWebApp_httpserver PUBLIC QtWebApp/httpserver)
-target_link_libraries(QtWebApp_httpserver PUBLIC Qt::Network)
+target_link_libraries(QtWebApp_httpserver PUBLIC Qt6::Network)
 
 # --- QtWebApp template engine ---
 add_library(QtWebApp_templateengine STATIC
@@ -69,7 +69,7 @@ add_library(QtWebApp_templateengine STATIC
     QtWebApp/templateengine/templatecache.h
 )
 target_include_directories(QtWebApp_templateengine PUBLIC QtWebApp/templateengine)
-target_link_libraries(QtWebApp_templateengine PUBLIC Qt::Core5Compat)
+target_link_libraries(QtWebApp_templateengine PUBLIC Qt6::Core5Compat)
 
 # --- KDSignalThrottler (from KDToolBox) ---
 add_library(KDSignalThrottler STATIC
@@ -77,4 +77,4 @@ add_library(KDSignalThrottler STATIC
     KDToolBox/KDSignalThrottler.h
 )
 target_include_directories(KDSignalThrottler PUBLIC KDToolBox)
-target_link_libraries(KDSignalThrottler PUBLIC Qt::Core)
+target_link_libraries(KDSignalThrottler PUBLIC Qt6::Core)