diff --git a/.github/workflows/posix.yml b/.github/workflows/posix.yml
index e6a64bf..8fc995b 100644
--- a/.github/workflows/posix.yml
+++ b/.github/workflows/posix.yml
@@ -11,7 +11,7 @@ on:
 
 env:
   REPO_DIR: OpenBLAS
-  OPENBLAS_COMMIT: "v0.3.29"
+  OPENBLAS_COMMIT: "v0.3.29-265-gb5456c1b"
   MACOSX_DEPLOYMENT_TARGET: 10.9
 
 jobs:
diff --git a/.github/workflows/windows-arm.yml b/.github/workflows/windows-arm.yml
new file mode 100644
index 0000000..39de70d
--- /dev/null
+++ b/.github/workflows/windows-arm.yml
@@ -0,0 +1,98 @@
+name: Windows-on-ARM
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+env:
+  OPENBLAS_COMMIT: "v0.3.29-265-gb5456c1b"
+  OPENBLAS_ROOT: "c:\\opt"
+  # Preserve working directory for calls into bash
+  # Without this, invoking bash will cd to the home directory
+  CHERE_INVOKING: "yes"
+  BASH_PATH: "C:\\Program Files\\Git\\bin\\bash.exe"
+  PLAT: arm64
+  INTERFACE64: 0
+  BUILD_BITS: 32
+
+jobs:
+  build:
+    runs-on: windows-11-arm
+    timeout-minutes: 90
+
+    steps:
+
+    - uses: actions/checkout@v4.1.1
+
+    - name: Set up Python
+      uses: actions/setup-python@v5
+      with:
+        python-version: 3.12
+        architecture: arm64
+
+    - name: Setup visual studio
+      uses: microsoft/setup-msbuild@v2
+
+    - name: Download, install 7zip.
+      run: |
+        Invoke-WebRequest https://www.7-zip.org/a/7z2409-arm64.exe -UseBasicParsing -OutFile 7z_arm.exe
+        Start-Process -FilePath ".\7z_arm.exe" -ArgumentList "/S" -Wait
+        echo "C:\Program Files\7-Zip" | Out-File -FilePath $env:GITHUB_PATH -Encoding utf8 -Append
+
+    - name: Download and install LLVM installer
+      run: |
+        Invoke-WebRequest https://github.com/llvm/llvm-project/releases/download/llvmorg-19.1.5/LLVM-19.1.5-woa64.exe -UseBasicParsing -OutFile LLVM-woa64.exe
+        Start-Process -FilePath ".\LLVM-woa64.exe" -ArgumentList "/S" -Wait
+        echo "C:\Program Files\LLVM\bin" | Out-File -FilePath $env:GITHUB_PATH -Encoding utf8 -Append
+
+    - name: Update CMake for WoA
+      run: |
+        pip install cmake
+        get-command cmake
+
+    - name: Build
+      run: |
+        git submodule update --init --recursive
+        .\tools\build_steps_win_arm64.bat
+
+    - name: Pack
+      run: |
+        cd local
+        cp -r "scipy_openblas${env:BUILD_BITS}" $env:BUILD_BITS
+        7z a ../builds/openblas-${env:PLAT}-${env:INTERFACE64}.zip -tzip $env:BUILD_BITS
+
+    - name: Test 32-bit interface wheel
+      run: |
+        python -m pip install --no-index --find-links dist scipy_openblas32
+        python -m scipy_openblas32
+        python -c "import scipy_openblas32; print(scipy_openblas32.get_pkg_config())"
+
+    - uses: actions/upload-artifact@v4.3.0
+      with:
+        name: wheels-${{ env.PLAT }}-${{ env.INTERFACE64 }}
+        path: dist/scipy_openblas*.whl
+
+    - uses: actions/upload-artifact@v4.3.0
+      with:
+        name: openblas-${{ env.PLAT }}-${{ env.INTERFACE64 }}
+        path: builds/openblas*.zip
+
+    - name: Install Anaconda client
+      run: |
+        # Rust installation needed for rpds-py.
+        Invoke-WebRequest https://static.rust-lang.org/rustup/dist/aarch64-pc-windows-msvc/rustup-init.exe -UseBasicParsing -Outfile rustup-init.exe
+        .\rustup-init.exe -y
+        $env:PATH="$env:PATH;$env:USERPROFILE\.cargo\bin"
+        pip install anaconda-client
+
+    - name: Upload
+      # see https://github.com/marketplace/actions/setup-miniconda for why
+      # `-el {0}` is required.
+      shell: bash -el {0}
+      env:
+       ANACONDA_SCIENTIFIC_PYTHON_UPLOAD: ${{ secrets.ANACONDA_SCIENTIFIC_PYTHON_UPLOAD }}
+      run: |
+        source tools/upload_to_anaconda_staging.sh
+        upload_wheels
diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
index 07bc986..4e28402 100644
--- a/.github/workflows/windows.yml
+++ b/.github/workflows/windows.yml
@@ -8,7 +8,7 @@ on:
   workflow_dispatch: null
 
 env:
-  OPENBLAS_COMMIT: "v0.3.29"
+  OPENBLAS_COMMIT: "v0.3.29-265-gb5456c1b"
   OPENBLAS_ROOT: "c:\\opt"
   # Preserve working directory for calls into bash
   # Without this, invoking bash will cd to the home directory
diff --git a/OpenBLAS b/OpenBLAS
index 0929865..b5456c1 160000
--- a/OpenBLAS
+++ b/OpenBLAS
@@ -1 +1 @@
-Subproject commit 092986582f8fb27dde00918d1f618776fe58c11a
+Subproject commit b5456c1b41ea88d4e0041778aa8ec09ee2a111a0
diff --git a/pyproject.toml b/pyproject.toml
index 3efd37f..7b2fa54 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -9,7 +9,7 @@ build-backend = "setuptools.build_meta"
 [project]
 name = "scipy-openblas64"
 # v0.3.29
-version = "0.3.29.0.0"
+version = "0.3.29.265.0"
 requires-python = ">=3.7"
 description = "Provides OpenBLAS for python packaging"
 readme = "README.md"
diff --git a/tools/build_steps_win_arm64.bat b/tools/build_steps_win_arm64.bat
old mode 100644
new mode 100755
index 2613865..808e04d
--- a/tools/build_steps_win_arm64.bat
+++ b/tools/build_steps_win_arm64.bat
@@ -1,52 +1,92 @@
 :: Build script for scipy_openblas wheel on Windows on ARM64
 
-:: Usage: build_steps_win_arm64.bat [build_bits]
-:: e.g build_steps_win_arm64.bat 64
+:: Usage: build_steps_win_arm64.bat [build_bits] [if_bits]
+:: e.g build_steps_win_arm64.bat 64 64
 
-:: BUILD_BITS  (default binary architecture, 32 or 64, unspec -> 64).
+:: build_bits  (default binary architecture, 32 or 64, unspec -> 64).
+:: if_bits (default interface size, 32 or 64, unspec -> 32)
+:: If INTERFACE64 environment variable is 1, then if_bits defaults to 64
 :: Expects these binaries on the PATH:
-:: clang-cl, flang-new, cmake, perl
+::   clang-cl, flang-new, cmake, perl
+:: Uses environment variable:
+::   OPENBLAS_COMMIT  (unspec -> current submodule commit, if contains
+::     Windows on ARM build fixes (see below), otherwise earliest commit
+::     with those fixes).
+
+:: First commit containing WoA build fixes.
+:: Minimum OpenBLAS commit to build; we'll update to this if commit not
+:: present.
+set first_woa_buildable_commit="de2380e5a6149706a633322a16a0f66faa5591fc"
 
 @echo off
 setlocal enabledelayedexpansion
 
 if "%1"=="" (
-    set BUILD_BIT=64
+    set build_bits=64
+) else (
+    set build_bits=%1
+)
+if "%INTERFACE64%"=="1" (
+    set "if_default=64"
+) else (
+    set "if_default=32"
+)
+if "%2"=="" (
+    set "if_bits=%if_default%"
 ) else (
-    set BUILD_BIT=%1
+    set "if_bits=%2"
 )
-echo Building for %BUILD_BIT%-bit configuration...
+echo Building for %build_bits%-bit binary, %if_bits%-bit interface...
  
 :: Define destination directory
-move "..\local\scipy_openblas64" "..\local\scipy_openblas32"
-set "DEST_DIR=%CD%\..\local\scipy_openblas32"
-cd ..
- 
-:: Check if 'openblas' folder exists and is empty
-if exist "openblas" (
-    dir /b "openblas" | findstr . >nul
-    if errorlevel 1 (
-        echo OpenBLAS folder exists but is empty. Deleting and recloning...
-        rmdir /s /q "openblas"
+pushd "%~dp0\.."
+set "ob_out_root=%CD%\local\scipy_openblas"
+set "ob_64=%ob_out_root%64"
+set "ob_32=%ob_out_root%32"
+set "local_dir=%CD%\local"
+for /d %%D in ("%local_dir%\*") do (
+    if /I not "%%~nxD"=="scipy_openblas64" (
+        rmdir /S /Q "%%D"
     )
 )
- 
-:: Clone OpenBLAS if not present
-if not exist "openblas" (
-    echo Cloning OpenBLAS repository with submodules...
-    git clone --recursive https://github.com/OpenMathLib/OpenBLAS.git OpenBLAS
-    if errorlevel 1 exit /b 1
+if "%if_bits%"=="64" (
+    set "DEST_DIR=%ob_64%"
+) else (
+    if exist "%ob_64%" (
+    xcopy /Y /H "%ob_64%\*.py" "%CD%\ob64_backup\"
+    move "%ob_64%" "%ob_32%"
+    set "DEST_DIR=%ob_32%"
+    )
 )
+
+:: Clone OpenBLAS
+echo Cloning OpenBLAS repository with submodules...
+git submodule update --init --recursive OpenBLAS
+if errorlevel 1 exit /b 1
  
-:: Enter OpenBLAS directory and checkout develop branch
-cd openblas
-git checkout develop
- 
-echo Checked out to the latest branch of OpenBLAS.
+:: Enter OpenBLAS directory and checkout buildable commit
+cd OpenBLAS
+if defined OPENBLAS_COMMIT (
+    echo Checking out OpenBLAS commit %OPENBLAS_COMMIT%
+    git checkout %OPENBLAS_COMMIT%
+)
+git merge-base --is-ancestor %first_woa_buildable_commit% HEAD 2>NUL
+if errorlevel 1 (
+    echo OpenBLAS commit does not contain WoA build fixes.
+    echo Commit needs to contain %first_woa_buildable_commit%.
+    exit /b 2
+)
  
+:: Set suffixed-ILP64 flags
+if "%if_bits%"=="64" (
+    set "interface_flags=-DINTERFACE64=1 -DSYMBOLSUFFIX=64_"
+) else (
+    set "interface_flags="
+)
+
 :: Create build directory and navigate to it
-if not exist build mkdir build
-cd build
+if exist build (rmdir /S /Q build || exit /b 1)
+mkdir build || exit /b 1 & cd build || exit /b 1
  
 echo Setting up ARM64 Developer Command Prompt and running CMake...
  
@@ -55,28 +95,30 @@ for /f "usebackq tokens=*" %%i in (`"C:\Program Files (x86)\Microsoft Visual Stu
  
 :: Run CMake and Ninja build
 cmake .. -G Ninja -DCMAKE_BUILD_TYPE=Release -DTARGET=ARMV8 -DBUILD_SHARED_LIBS=ON -DARCH=arm64 ^
--DBINARY=%BUILD_BIT% -DCMAKE_SYSTEM_PROCESSOR=ARM64 -DCMAKE_C_COMPILER=clang-cl ^
--DCMAKE_Fortran_COMPILER=flang-new -DSYMBOLPREFIX="scipy_" -DLIBNAMEPREFIX="scipy_"
+-DBINARY=%build_bits% -DCMAKE_SYSTEM_PROCESSOR=ARM64 -DCMAKE_C_COMPILER=clang-cl ^
+-DCMAKE_Fortran_COMPILER=flang-new -DSYMBOLPREFIX="scipy_" -DLIBNAMEPREFIX="scipy_" %interface_flags%
 if errorlevel 1 exit /b 1
- 
+
 ninja
 if errorlevel 1 exit /b 1
  
 echo Build complete. Returning to Batch.
 
-:: Rewrite the name of the project to scipy-openblas32
-echo Rewrite to scipy_openblas32
-cd ../..
-powershell -Command "(Get-Content 'pyproject.toml') -replace 'openblas64', 'openblas32' | Set-Content 'pyproject.toml'"
-powershell -Command "(Get-Content 'local\scipy_openblas32\__main__.py') -replace 'openblas64', 'openblas32' | Out-File 'local\scipy_openblas32\__main__.py' -Encoding utf8"
-powershell -Command "(Get-Content 'local\scipy_openblas32\__init__.py') -replace 'openblas64', 'openblas32' | Out-File 'local\scipy_openblas32\__init__.py' -Encoding utf8"
-powershell -Command "(Get-Content 'local\scipy_openblas32\__init__.py') -replace 'openblas_get_config64_', 'openblas_get_config' | Out-File 'local\scipy_openblas32\__init__.py' -Encoding utf8"
-powershell -Command "(Get-Content 'local\scipy_openblas32\__init__.py') -replace 'cflags =.*', 'cflags = \"-DBLAS_SYMBOL_PREFIX=scipy_\"' | Out-File 'local\scipy_openblas32\__init__.py' -Encoding utf8"
+if "%if_bits%"=="32" (
+    echo Rewrite to scipy_openblas32
+    cd ../..
+    set out_pyproject=pyproject_64_32.toml
+    powershell -Command "(Get-Content 'pyproject.toml') -replace 'openblas64', 'openblas32' | Set-Content !out_pyproject!"
+    powershell -Command "(Get-Content 'local\scipy_openblas32\__main__.py') -replace 'openblas64', 'openblas32' | Out-File 'local\scipy_openblas32\__main__.py' -Encoding utf8"
+    powershell -Command "(Get-Content 'local\scipy_openblas32\__init__.py') -replace 'openblas64', 'openblas32' | Out-File 'local\scipy_openblas32\__init__.py' -Encoding utf8"
+    powershell -Command "(Get-Content 'local\scipy_openblas32\__init__.py') -replace 'openblas_get_config64_', 'openblas_get_config' | Out-File 'local\scipy_openblas32\__init__.py' -Encoding utf8"
+    powershell -Command "(Get-Content 'local\scipy_openblas32\__init__.py') -replace 'cflags =.*', 'cflags = \"-DBLAS_SYMBOL_PREFIX=scipy_\"' | Out-File 'local\scipy_openblas32\__init__.py' -Encoding utf8"
+)
 
 :: Prepare destination directory
 cd OpenBLAS/build
 echo Preparing destination directory at %DEST_DIR%...
-if not exist "%DEST_DIR%\lib\cmake\openblas" mkdir "%DEST_DIR%\lib\cmake\openblas"
+if not exist "%DEST_DIR%\lib\cmake\OpenBLAS" mkdir "%DEST_DIR%\lib\cmake\OpenBLAS"
 if not exist "%DEST_DIR%\include" mkdir "%DEST_DIR%\include"
  
 :: Move library files
@@ -84,7 +126,11 @@ echo Moving library files...
 if exist lib\release (
     move /Y lib\release\*.dll "%DEST_DIR%\lib\"
     if errorlevel 1 exit /b 1
-    move /Y lib\release\*.dll.a "%DEST_DIR%\lib\scipy_openblas.lib"
+    for %%f in (lib\release\*.dll.a) do (
+        set "orig_name=%%~nxf"
+        call set "base_name=%%orig_name:.dll.a=%%"
+        move /Y "%%f" "%DEST_DIR%\lib\!base_name!.lib"
+    )
     if errorlevel 1 exit /b 1
 ) else (
     echo Error: lib/release directory not found!
@@ -99,7 +145,7 @@ if exist openblasconfigversion.cmake copy /Y openblasconfigversion.cmake "%DEST_
 :: Copy header files
 echo Copying generated header files...
 if exist generated xcopy /E /Y generated "%DEST_DIR%\include\"
-if exist lapacke_mangling copy /Y lapacke_mangling "%DEST_DIR%\include\"
+if exist lapacke_mangling.h copy /Y lapacke_mangling.h "%DEST_DIR%\include\"
 if exist openblas_config.h copy /Y openblas_config.h "%DEST_DIR%\include\"
 
  
@@ -113,12 +159,32 @@ cd ../..
  
 :: Build the Wheel & Install It
 echo Running 'python -m build' to build the wheel...
-python -m build
-if errorlevel 1 exit /b 1
- 
+python -c "import build" 2>NUL || pip install build
+if "%if_bits%"=="64" (
+    python -m build
+    if errorlevel 1 exit /b 1
+) else (
+    move /Y pyproject.toml pyproject.toml.bak
+    move /Y %out_pyproject% pyproject.toml
+    python -m build
+    if errorlevel 1 exit /b 1
+    move /Y pyproject.toml.bak pyproject.toml
+)
+if "%if_bits%"=="32" (
+    move /Y "%CD%\ob64_backup" "%ob_64%"
+)
+
+:: Rename the wheel
+for %%f in (dist\*any.whl) do (
+    set WHEEL_FILE=dist\%%f
+    set "filename=%%~nxf"
+    set "newname=!filename:any.whl=win_arm64.whl!"
+    ren "dist\!filename!" "!newname!"
+)
+
 :: Locate the built wheel
 for /f %%f in ('dir /b dist\scipy_openblas*.whl 2^>nul') do set WHEEL_FILE=dist\%%f
- 
+
 if not defined WHEEL_FILE (
     echo Error: No wheel file found in dist folder.
     exit /b 1
@@ -129,4 +195,4 @@ pip install "%WHEEL_FILE%"
 if errorlevel 1 exit /b 1
  
 echo Done.
-exit /b 0
\ No newline at end of file
+exit /b 0