diff --git a/development/Win32/packaging/installer/ChangeLog.txt b/development/Win32/packaging/installer/ChangeLog.txt
index d1c358025a..8f9d140e8e 100644
--- a/development/Win32/packaging/installer/ChangeLog.txt
+++ b/development/Win32/packaging/installer/ChangeLog.txt
@@ -4,7 +4,7 @@
 - correct display of installer text for many languages 
 - fix bug that the BibTeX editor Jabref and the image editor Krita
   were not detected as 64bit application
-- updated to Qt 5.9.2
+- updated to Qt 5.9.3
 - updated to MiKTeX 2.9 build 6520
 - updated to ImageMagick 7.0.7-8
 - updated to Ghostscript 9.22
diff --git a/development/Win32/packaging/installer/settings.nsh b/development/Win32/packaging/installer/settings.nsh
index a0079c688d..c4ee544ddb 100644
--- a/development/Win32/packaging/installer/settings.nsh
+++ b/development/Win32/packaging/installer/settings.nsh
@@ -14,7 +14,7 @@ These typically need to be modified for each LyX release
 !define APP_VERSION_REVISION 0
 !define APP_VERSION_EMERGENCY "RC-1" # use "1" for an emergency release of LyX otherwise ""
 !define APP_EMERGENCY_DOT "" # use "." for an emergency release of LyX otherwise ""
-!define APP_VERSION_BUILD 5 # Start with 1 for the installer releases of each version
+!define APP_VERSION_BUILD 6 # Start with 1 for the installer releases of each version
 
 !define APP_VERSION "${APP_VERSION_MAJOR}.${APP_VERSION_MINOR}.${APP_VERSION_REVISION}${APP_EMERGENCY_DOT}${APP_VERSION_EMERGENCY}" # Version to display
 
@@ -38,7 +38,7 @@ These typically need to be modified for each LyX release
 
 !define FILES_LYX "D:\LyXPackage2.3\LyX"
 !define FILES_DEPS "D:\LyXGit\Master\lyx-windows-deps-msvc2015"
-!define FILES_QT "C:\Qt\Qt5.9.2\5.9.2\msvc2015"
+!define FILES_QT "C:\Qt\Qt5.9.3\5.9.3\msvc2015"
 !define ClassFileDir "${FILES_LYX}\Resources\tex"
 !define DVIPostFileDir "${FILES_DEPS}\tex"
 
diff --git a/development/cmake/build5-2015-installer.bat b/development/cmake/build5-2015-installer.bat
index 4411d74660..c0c4566537 100644
--- a/development/cmake/build5-2015-installer.bat
+++ b/development/cmake/build5-2015-installer.bat
@@ -5,7 +5,7 @@ REM Create a link and add  cmd.exe /k  in the preferences in front of the mingw.
 ::echo off
 
 REM Install Qt from qt.io
-set PATH=C:\Qt\Qt5.6.3\5.6.3\msvc2015\bin;%PATH%
+set PATH=C:\Qt\Qt5.9.3\5.9.3\msvc2015\bin;%PATH%
 
 set LYX_SOURCE=%~DP0..\..
 set LYX_BUILD=%LYX_SOURCE%\..\build-result-5-2015
diff --git a/development/cmake/build5-2015-x64.bat b/development/cmake/build5-2015-x64.bat
index aa7b3182d4..9ca66c9f0b 100644
--- a/development/cmake/build5-2015-x64.bat
+++ b/development/cmake/build5-2015-x64.bat
@@ -33,7 +33,7 @@ REM Save path
 set CALLED_FROM=%CD%
 
 REM Add path to qmake here or set PATH correctly on your system.
-set PATH=C:\Qt\Qt5.6.3\5.6.3\msvc2015_64\bin;%PATH%
+set PATH=C:\Qt\Qt5.9.3\5.9.3\msvc2015_64;%PATH%
 
 REM Edit pathes here or set the environment variables on your system.
 set GNUWIN32_DIR=D:\LyXGit\Master\lyx-windows-deps-msvc2015-x64
diff --git a/development/cmake/build5-2015.bat b/development/cmake/build5-2015.bat
index fded326f3f..413ec5388c 100644
--- a/development/cmake/build5-2015.bat
+++ b/development/cmake/build5-2015.bat
@@ -34,7 +34,7 @@ set CALLED_FROM=%CD%
 
 REM Edit pathes here or set the environment variables on your system.
 set CMAKE_PATH="C:\Program Files\CMake\bin"
-set QT_PATH="C:\Qt\Qt5.6.3\5.6.3\msvc2015\bin"
+set QT_PATH="C:\Qt\Qt5.9.3\5.9.3\msvc2015"
 set GNUWIN32_DIR="D:\LyXGit\Master\lyx-windows-deps-msvc2015"
 set LYX_SOURCE="D:\LyXGit\Master"
 set LYX_BUILD="D:\LyXGit\Master\compile-2015"