diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index abcfb54..2074e54 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -11,7 +11,7 @@ jobs:
     name: Windows Server Core LTSC2025
     runs-on: windows-2025
     env:
-      TAG: "windowsservercore-ltsc2025-qt6.6-64bit"
+      TAG: "windowsservercore-ltsc2025-qt6.9-64bit"
     permissions:
       contents: read
       packages: write
diff --git a/README.md b/README.md
index 7916708..5a208f2 100644
--- a/README.md
+++ b/README.md
@@ -55,6 +55,12 @@ and OpenCascade OCCT 7.7.2. This image was intended for deployment of official
 ### `windowsservercore-ltsc2025-qt6.6-64bit`
 
 Based on Windows Server Core LTSC2025 with Qt6.6.x, MinGW 11.2.0 64-bit
+and OpenCascade OCCT 7.9.1. This image was intended for deployment of official
+64-bit binary releases of LibrePCB for Windows.
+
+### `windowsservercore-ltsc2025-qt6.9-64bit`
+
+Based on Windows Server Core LTSC2025 with Qt6.9.x, MinGW 13.1.0 64-bit
 and OpenCascade OCCT 7.9.1. This image is intended for deployment of official
 64-bit binary releases of LibrePCB for Windows.
 
diff --git a/windowsservercore-ltsc2025-qt6.9-64bit/Dockerfile b/windowsservercore-ltsc2025-qt6.9-64bit/Dockerfile
new file mode 100644
index 0000000..0d5a70d
--- /dev/null
+++ b/windowsservercore-ltsc2025-qt6.9-64bit/Dockerfile
@@ -0,0 +1,207 @@
+# Image tag: ltsc2025
+# Referenced by digest to avoid broken caching on CI.
+FROM mcr.microsoft.com/windows/servercore@sha256:4c8150b6fe78cac412f24690d250c97c29a8cf2b0f241be7e9330e7d93292305
+
+# Add OpenGL DLLs from a Windows desktop to allow running unit tests within the container
+ADD *.dll C:/Windows/System32/
+
+# Add Arial font since Slint requires it, see
+# https://github.com/slint-ui/slint/issues/2556#issuecomment-2995413102
+ADD arial.ttf C:/Windows/Fonts/
+
+# Install Microsoft Visual C++ Redistributable for Visual Studio 2015-2022
+ARG VCREDIST_URL="https://download.visualstudio.microsoft.com/download/pr/6ba404bb-6312-403e-83be-04b062914c98/1AD7988C17663CC742B01BEF1A6DF2ED1741173009579AD50A94434E54F56073/VC_redist.x64.exe"
+RUN curl -o "C:/tmp.exe" -L "%VCREDIST_URL%" \
+  && C:/tmp.exe /quiet /norestart \
+  && del C:\tmp.exe
+
+# Install 7-Zip
+# Attention: I observed issues with version 2409, thus better keep the old version
+ARG 7ZIP_URL="https://7-zip.org/a/7z2301-x64.exe"
+RUN curl -o "C:/tmp.exe" -L "%7ZIP_URL%" \
+  && C:/tmp.exe /S /D="C:/7zip" \
+  && setx PATH "%PATH%;C:\7zip" \
+  && del C:\tmp.exe
+
+# Install Git
+# Attention: Version 2.50 breaks our CI in a strange way!
+ARG GIT_VERSION="2.44.0"
+ARG GIT_URL="https://github.com/git-for-windows/git/releases/download/v$GIT_VERSION.windows.1/Git-$GIT_VERSION-64-bit.exe"
+RUN curl -o "C:/tmp.exe" -L "%GIT_URL%" \
+  && C:/tmp.exe /VERYSILENT /NORESTART /NOCANCEL /SP- /CLOSEAPPLICATIONS /RESTARTAPPLICATIONS \
+                /COMPONENTS="gitlfs" /o:PathOption="CmdTools" /o:CRLFOption="LFOnly" /DIR:"C:/git" \
+  && del C:\tmp.exe
+
+# Install UV
+ARG UV_URL="https://github.com/astral-sh/uv/releases/download/0.7.13/uv-x86_64-pc-windows-msvc.zip"
+RUN curl -o "C:/tmp.zip" -L "%UV_URL%" \
+  && 7z x C:/tmp.zip -oC:/uv -bsp1 \
+  && setx PYTHONIOENCODING "UTF-8" \
+  && setx PATH "%PATH%;C:\uv" \
+  && del C:\tmp.zip
+
+# Install CMake
+ARG CMAKE_VERSION="4.0.3"
+ARG CMAKE_URL="https://github.com/Kitware/CMake/releases/download/v$CMAKE_VERSION/cmake-$CMAKE_VERSION-windows-x86_64.zip"
+RUN curl -o "C:/tmp.zip" -L "%CMAKE_URL%" \
+  && 7z x C:/tmp.zip -oC:/ -bsp1 \
+  && rename cmake-%CMAKE_VERSION%-windows-x86_64 cmake \
+  && setx PATH "%PATH%;C:\cmake\bin" \
+  && del C:\tmp.zip
+
+# Install Ninja
+ARG NINJA_URL="https://github.com/ninja-build/ninja/releases/download/v1.12.1/ninja-win.zip"
+RUN curl -o "C:/tmp.zip" -L "%NINJA_URL%" \
+  && 7z x C:/tmp.zip -oC:/ninja -bsp1 \
+  && setx PATH "%PATH%;C:\ninja" \
+  && del C:\tmp.zip
+
+# Install CCache
+ARG CCACHE_VERSION="4.11.3"
+ARG CCACHE_URL="https://github.com/ccache/ccache/releases/download/v$CCACHE_VERSION/ccache-$CCACHE_VERSION-windows-x86_64.zip"
+RUN curl -o "C:/tmp.zip" -L "%CCACHE_URL%" \
+  && 7z x C:/tmp.zip -oC:/ -bsp1 \
+  && rename ccache-%CCACHE_VERSION%-windows-x86_64 ccache \
+  && setx PATH "%PATH%;C:\ccache" \
+  && del C:\tmp.zip
+
+# Install MinGW
+ARG MINGW_URL="https://download.qt.io/online/qtsdkrepository/windows_x86/desktop/tools_mingw1310/qt.tools.win64_mingw1310/13.1.0-202407240918mingw1310.7z"
+RUN curl -o "C:/tmp.7z" -L "%MINGW_URL%" \
+  && 7z x C:/tmp.7z -oC:/Qt -bsp1 \
+  && setx PATH "%PATH%;C:\Qt\Tools\mingw1310_64\bin" \
+  && del C:\tmp.7z
+
+# Install Rust
+ARG RUST_VERSION="1.87.0"
+ENV RUSTUP_HOME="C:\rustup" \
+    CARGO_HOME="C:\cargo"
+RUN curl -o "C:/rustup-init.exe" -L "https://win.rustup.rs/x86_64" \
+  && C:/rustup-init.exe -y -v \
+     --profile minimal \
+     --default-host x86_64-pc-windows-gnu \
+     --default-toolchain none \
+  && C:\cargo\bin\rustup install %RUST_VERSION% \
+  && del C:\rustup-init.exe
+
+# Install ZLib
+ARG ZLIB_VERSION="1.3.1"
+ARG ZLIB_URL="https://github.com/madler/zlib/releases/download/v$ZLIB_VERSION/zlib131.zip"
+RUN curl -o "C:/tmp.zip" -L "%ZLIB_URL%" \
+  && 7z x C:/tmp.zip -oC:/ -bsp1 \
+  && cd C:/zlib-%ZLIB_VERSION% \
+  && cmake . -G "Ninja" -DCMAKE_INSTALL_PREFIX=C:/zlib \
+  && ninja \
+  && ninja install \
+  && setx ZLIB_ROOT "C:/zlib" \
+  && setx PATH "%PATH%;C:\zlib\bin" \
+  && cd .. \
+  && rmdir C:\zlib-%ZLIB_VERSION% /s /q \
+  && del C:\tmp.zip
+
+# Install OpenCascade
+ARG OCC_VERSION="7_9_1"
+ARG OCC_URL="https://github.com/Open-Cascade-SAS/OCCT/archive/refs/tags/V$OCC_VERSION.zip"
+RUN curl -o "C:/tmp.zip" -L "%OCC_URL%" \
+  && 7z x C:/tmp.zip -oC:/ -bsp1 \
+  && cd C:\OCCT-%OCC_VERSION% \
+  && cmake . -G "Ninja" \
+       -DCMAKE_BUILD_TYPE=Release \
+       -DINSTALL_DIR=C:/OpenCascade \
+       -DBUILD_LIBRARY_TYPE=Shared \
+       -DBUILD_DOC_Overview=0 \
+       -DBUILD_MODULE_ApplicationFramework=0 \
+       -DBUILD_MODULE_DataExchange=1 \
+       -DBUILD_MODULE_Draw=0 \
+       -DBUILD_MODULE_FoundationClasses=0 \
+       -DBUILD_MODULE_ModelingAlgorithms=0 \
+       -DBUILD_MODULE_ModelingData=0 \
+       -DBUILD_MODULE_Visualization=0 \
+       -DUSE_DRACO=0 \
+       -DUSE_FREEIMAGE=0 \
+       -DUSE_FREETYPE=0 \
+       -DUSE_GLES2=0 \
+       -DUSE_OPENGL=0 \
+       -DUSE_OPENVR=0 \
+       -DUSE_RAPIDJSON=0 \
+       -DUSE_TBB=0 \
+       -DUSE_TK=0 \
+       -DUSE_VTK=0 \
+  && cmake --build . \
+  && cmake --install . \
+  && setx OpenCASCADE_DIR C:/OpenCascade/cmake \
+  && setx PATH "%PATH%;C:\OpenCascade\win64\gcc\bin" \
+  && cd .. \
+  && rmdir C:\OCCT-%OCC_VERSION% /s /q \
+  && del C:\tmp.zip
+
+# Install Qt Runtime DLLs
+ARG QT_VERSION="6.9.1"
+ARG QT_BASEURL="https://download.qt.io/online/qtsdkrepository/windows_x86/desktop/qt6_691/qt6_691"
+ARG QT_URL="${QT_BASEURL}/qt.qt6.691.win64_mingw/6.9.1-0-202505291653"
+ARG QT_DLLS_URL="${QT_URL}MinGW-w64-x86_64-13.1.0-release-posix-seh-msvcrt-rt_v11-rev1-runtime.7z"
+RUN curl -o "C:/tmp.7z" -L "%QT_DLLS_URL%" \
+  && 7z x C:/tmp.7z -oC:/Qt/%QT_VERSION%/mingw_64/bin -bsp1 \
+  && del C:\tmp.7z
+
+# Install Qt Tools
+ARG QT_TOOLS_URL="${QT_URL}qttools-Windows-Windows_10_22H2-Mingw-Windows-Windows_10_22H2-X86_64.7z"
+RUN curl -o "C:/tmp.7z" -L "%QT_TOOLS_URL%" \
+  && 7z x C:/tmp.7z -oC:/Qt/%QT_VERSION%/mingw_64 -bsp1 \
+  && setx PATH "%PATH%;C:\Qt\%QT_VERSION%\mingw_64\bin" \
+  && del C:\tmp.7z
+
+# Install Qt Base
+ARG QT_BASE_URL="${QT_URL}qtbase-Windows-Windows_10_22H2-Mingw-Windows-Windows_10_22H2-X86_64.7z"
+RUN curl -o "C:/tmp.7z" -L "%QT_BASE_URL%" \
+  && 7z x C:/tmp.7z -oC:/Qt/%QT_VERSION%/mingw_64 -bsp1 \
+  && del C:\tmp.7z
+
+# Install Qt SVG
+ARG QT_SVG_URL="${QT_URL}qtsvg-Windows-Windows_10_22H2-Mingw-Windows-Windows_10_22H2-X86_64.7z"
+RUN curl -o "C:/tmp.7z" -L "%QT_SVG_URL%" \
+  && 7z x C:/tmp.7z -oC:/Qt/%QT_VERSION%/mingw_64 -bsp1 \
+  && del C:\tmp.7z
+
+# Install Qt OpenGL (not sure if needed)
+ARG QT_QT5OPENGL_URL="${QT_URL}opengl32sw-64-mesa_11_2_2-signed_sha256.7z"
+RUN curl -o "C:/tmp.7z" -L "%QT_QT5OPENGL_URL%" \
+  && 7z x C:/tmp.7z -oC:/Qt/%QT_VERSION%/mingw_64/bin -bsp1 \
+  && del C:\tmp.7z
+
+# Install Qt Translations
+ARG QT_TRANSLATIONS_URL="${QT_URL}qttranslations-Windows-Windows_10_22H2-Mingw-Windows-Windows_10_22H2-X86_64.7z"
+RUN curl -o "C:/tmp.7z" -L "%QT_TRANSLATIONS_URL%" \
+  && 7z x C:/tmp.7z -oC:/Qt/%QT_VERSION%/mingw_64 -bsp1 \
+  && del C:\tmp.7z
+
+# Install Qt Image Formats Plugin
+ARG QT_IMAGEFORMATS_URL="${QT_BASEURL}/qt.qt6.691.addons.qtimageformats.win64_mingw/6.9.1-0-202505291653qtimageformats-Windows-Windows_10_22H2-Mingw-Windows-Windows_10_22H2-X86_64.7z"
+RUN curl -o "C:/tmp.7z" -L "%QT_IMAGEFORMATS_URL%" \
+  && 7z x C:/tmp.7z -oC:/Qt/%QT_VERSION%/mingw_64 -bsp1 \
+  && del C:\tmp.7z
+
+# Install Inno Setup
+# Note: 6.4.3 emits some warnings when generating the LibrePCB installer,
+# should be reviewed when upgrading
+ARG INNOSETUP_URL="https://files.jrsoftware.org/is/6/innosetup-6.2.2.exe"
+RUN curl -o "C:/tmp.exe" -L "%INNOSETUP_URL%" \
+  && C:/tmp.exe /NOICONS /VERYSILENT /DIR=C:\innosetup \
+  && setx PATH "%PATH%;C:\innosetup" \
+  && del C:\tmp.exe
+
+# Install AzureSignTool for signing official releases
+ARG AZURESIGNTOOL_URL="https://github.com/vcsjones/AzureSignTool/releases/download/v6.0.1/AzureSignTool-x64.exe"
+RUN mkdir C:\ast \
+  && curl -o "C:/ast/AzureSignTool.exe" -L "%AZURESIGNTOOL_URL%" \
+  && setx PATH "%PATH%;C:\ast"
+
+# Pre-install a Python version
+RUN uv python install 3.13
+
+# Install OpenSSL (last one in Dockerfile because it should be updated regularly)
+ARG OPENSSL_URL="https://download.qt.io/online/qtsdkrepository/windows_x86/desktop/tools_opensslv3_x64/qt.tools.opensslv3.win_x64/3.0.16-1openssl_3.0.16_prebuild_x64.7z"
+RUN curl -o "C:/tmp.7z" -L "%OPENSSL_URL%" \
+  && 7z x C:/tmp.7z -oC:/Qt/Tools/OpenSSLv3 -bsp1 \
+  && setx OPENSSL_ROOT "C:/Qt/Tools/OpenSSLv3/Win_x64" \
+  && del C:\tmp.7z
diff --git a/windowsservercore-ltsc2025-qt6.9-64bit/arial.ttf b/windowsservercore-ltsc2025-qt6.9-64bit/arial.ttf
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diff --git a/windowsservercore-ltsc2025-qt6.9-64bit/glu32.dll b/windowsservercore-ltsc2025-qt6.9-64bit/glu32.dll
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diff --git a/windowsservercore-ltsc2025-qt6.9-64bit/opengl32.dll b/windowsservercore-ltsc2025-qt6.9-64bit/opengl32.dll
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