diff --git a/messagecomposer/CMakeLists.txt b/messagecomposer/CMakeLists.txt
index 3652c919..cce0ca9a 100644
--- a/messagecomposer/CMakeLists.txt
+++ b/messagecomposer/CMakeLists.txt
@@ -1,36 +1,36 @@
 ecm_setup_version(PROJECT VARIABLE_PREFIX MESSAGECOMPOSER
     VERSION_HEADER "${CMAKE_CURRENT_BINARY_DIR}/messagecomposer_version.h"
     PACKAGE_VERSION_FILE "${CMAKE_CURRENT_BINARY_DIR}/KF5MessageComposerConfigVersion.cmake"
-    SOVERSION 6
+    SOVERSION 5
     )
 
 configure_file(src/messagecomposer-version.h.cmake ${CMAKE_CURRENT_BINARY_DIR}/src/messagecomposer-version.h @ONLY)
 
 ########### CMake Config Files ###########
 set(CMAKECONFIG_INSTALL_DIR "${KDE_INSTALL_CMAKEPACKAGEDIR}/KF5MessageComposer")
 
 configure_package_config_file(
     "${CMAKE_CURRENT_SOURCE_DIR}/KF5MessageComposerConfig.cmake.in"
     "${CMAKE_CURRENT_BINARY_DIR}/KF5MessageComposerConfig.cmake"
     INSTALL_DESTINATION  ${CMAKECONFIG_INSTALL_DIR}
     )
 
 install(FILES
     "${CMAKE_CURRENT_BINARY_DIR}/KF5MessageComposerConfig.cmake"
     "${CMAKE_CURRENT_BINARY_DIR}/KF5MessageComposerConfigVersion.cmake"
     DESTINATION "${CMAKECONFIG_INSTALL_DIR}"
     COMPONENT Devel
     )
 
 install(EXPORT KF5MessageComposerTargets DESTINATION "${CMAKECONFIG_INSTALL_DIR}" FILE KF5MessageComposerTargets.cmake NAMESPACE KF5::)
 
 install(FILES
     ${CMAKE_CURRENT_BINARY_DIR}/messagecomposer_version.h
     DESTINATION ${KDE_INSTALL_INCLUDEDIR_KF5} COMPONENT Devel
     )
 
 add_subdirectory(src)
 if (BUILD_TESTING)
     add_subdirectory(autotests)
     add_subdirectory(tests)
 endif()
diff --git a/messagelist/CMakeLists.txt b/messagelist/CMakeLists.txt
index 86e1c7b3..0e9d905d 100644
--- a/messagelist/CMakeLists.txt
+++ b/messagelist/CMakeLists.txt
@@ -1,36 +1,36 @@
 ecm_setup_version(PROJECT VARIABLE_PREFIX MESSAGELIST
     VERSION_HEADER "${CMAKE_CURRENT_BINARY_DIR}/messagelist_version.h"
     PACKAGE_VERSION_FILE "${CMAKE_CURRENT_BINARY_DIR}/KF5MessageListConfigVersion.cmake"
-    SOVERSION 6
+    SOVERSION 5
     )
 
 ########### Targets ###########
 
 ########### CMake Config Files ###########
 set(CMAKECONFIG_INSTALL_DIR "${KDE_INSTALL_CMAKEPACKAGEDIR}/KF5MessageList")
 
 configure_package_config_file(
     "${CMAKE_CURRENT_SOURCE_DIR}/KF5MessageListConfig.cmake.in"
     "${CMAKE_CURRENT_BINARY_DIR}/KF5MessageListConfig.cmake"
     INSTALL_DESTINATION  ${CMAKECONFIG_INSTALL_DIR}
     )
 
 install(FILES
     "${CMAKE_CURRENT_BINARY_DIR}/KF5MessageListConfig.cmake"
     "${CMAKE_CURRENT_BINARY_DIR}/KF5MessageListConfigVersion.cmake"
     DESTINATION "${CMAKECONFIG_INSTALL_DIR}"
     COMPONENT Devel
     )
 
 install(EXPORT KF5MessageListTargets DESTINATION "${CMAKECONFIG_INSTALL_DIR}" FILE KF5MessageListTargets.cmake NAMESPACE KF5::)
 
 install(FILES
     ${CMAKE_CURRENT_BINARY_DIR}/messagelist_version.h
     DESTINATION ${KDE_INSTALL_INCLUDEDIR_KF5} COMPONENT Devel
     )
 
 add_subdirectory(src)
 if (BUILD_TESTING)
     add_subdirectory(autotests)
 endif()
 
diff --git a/messageviewer/CMakeLists.txt b/messageviewer/CMakeLists.txt
index 89db9efb..27485034 100644
--- a/messageviewer/CMakeLists.txt
+++ b/messageviewer/CMakeLists.txt
@@ -1,41 +1,41 @@
 ecm_setup_version(PROJECT VARIABLE_PREFIX MESSAGEVIEWER
     VERSION_HEADER "${CMAKE_CURRENT_BINARY_DIR}/messageviewer_version.h"
     PACKAGE_VERSION_FILE "${CMAKE_CURRENT_BINARY_DIR}/KF5MessageViewerConfigVersion.cmake"
-    SOVERSION 6
+    SOVERSION 5
     )
 
 
 ########### Targets ###########
 
 ########### CMake Config Files ###########
 set(CMAKECONFIG_INSTALL_DIR "${KDE_INSTALL_CMAKEPACKAGEDIR}/KF5MessageViewer")
 
 
 configure_package_config_file(
     "${CMAKE_CURRENT_SOURCE_DIR}/KF5MessageViewerConfig.cmake.in"
     "${CMAKE_CURRENT_BINARY_DIR}/KF5MessageViewerConfig.cmake"
     INSTALL_DESTINATION  ${CMAKECONFIG_INSTALL_DIR}
     )
 
 install(FILES
     "${CMAKE_CURRENT_BINARY_DIR}/KF5MessageViewerConfig.cmake"
     "${CMAKE_CURRENT_BINARY_DIR}/KF5MessageViewerConfigVersion.cmake"
     DESTINATION "${CMAKECONFIG_INSTALL_DIR}"
     COMPONENT Devel
     )
 
 install(EXPORT KF5MessageViewerTargets DESTINATION "${CMAKECONFIG_INSTALL_DIR}" FILE KF5MessageViewerTargets.cmake NAMESPACE KF5::)
 
 install(FILES
     ${CMAKE_CURRENT_BINARY_DIR}/messageviewer_version.h
     DESTINATION ${KDE_INSTALL_INCLUDEDIR_KF5} COMPONENT Devel
     )
 
 include_directories(${Messagelib_BINARY_DIR})
 
 add_subdirectory(src)
 if (BUILD_TESTING)
     add_subdirectory(autotests)
     add_subdirectory(tests)
 endif()
 
diff --git a/webengineviewer/CMakeLists.txt b/webengineviewer/CMakeLists.txt
index b4b27468..27c94685 100644
--- a/webengineviewer/CMakeLists.txt
+++ b/webengineviewer/CMakeLists.txt
@@ -1,32 +1,32 @@
 ecm_setup_version(PROJECT VARIABLE_PREFIX WEBENGINEVIEWER
     VERSION_HEADER "${CMAKE_CURRENT_BINARY_DIR}/webengineviewer_version.h"
     PACKAGE_VERSION_FILE "${CMAKE_CURRENT_BINARY_DIR}/KF5WebEngineViewerConfigVersion.cmake"
-    SOVERSION 6
+    SOVERSION 5
     )
 
 
 ########### CMake Config Files ###########
 set(CMAKECONFIG_INSTALL_DIR "${KDE_INSTALL_CMAKEPACKAGEDIR}/KF5WebEngineViewer")
 
 configure_package_config_file(
     "${CMAKE_CURRENT_SOURCE_DIR}/KF5WebEngineViewerConfig.cmake.in"
     "${CMAKE_CURRENT_BINARY_DIR}/KF5WebEngineViewerConfig.cmake"
     INSTALL_DESTINATION  ${CMAKECONFIG_INSTALL_DIR}
     )
 
 install(FILES
     "${CMAKE_CURRENT_BINARY_DIR}/KF5WebEngineViewerConfig.cmake"
     "${CMAKE_CURRENT_BINARY_DIR}/KF5WebEngineViewerConfigVersion.cmake"
     DESTINATION "${CMAKECONFIG_INSTALL_DIR}"
     COMPONENT Devel
     )
 
 install(EXPORT KF5WebEngineViewerTargets DESTINATION "${CMAKECONFIG_INSTALL_DIR}" FILE KF5WebEngineViewerTargets.cmake NAMESPACE KF5::)
 
 install(FILES
     ${CMAKE_CURRENT_BINARY_DIR}/webengineviewer_version.h
     DESTINATION ${KDE_INSTALL_INCLUDEDIR_KF5} COMPONENT Devel
     )
 include_directories(${Messagelib_BINARY_DIR})
 add_subdirectory(src)