pythonnet · filmor · Dec 9, 2025 · Dec 9, 2025 · Dec 9, 2025 · Dec 9, 2025
diff --git a/.github/actions/install-mono/action.yml b/.github/actions/install-mono/action.yml
@@ -0,0 +1,78 @@
+name: 'Install Mono'
+description: 'Install Mono'
+branding:
+  icon: package
+  color: blue
+inputs:
+  arch:
+    description: Architecture to install for
+    required: true
+runs:
+  using: "composite"
+  steps:
+    # Windows Cache
+    - name: Cache setup on Windows
+      if: runner.os == 'Windows'
+      run: |
+        mkdir -p .choco-cache
+        choco config set cacheLocation $(pwd)/.choco-cache
+      shell: bash
+
+    - name: Cache on Windows
+      if: runner.os == 'Windows'
+      uses: actions/cache@v5
+      with:
+        path: .choco-cache
+        key: mono-${{ runner.os }}-${{ inputs.arch }}
+
+    # macOS Cache
+    - name: Set Homebrew Cache Path
+      if: runner.os == 'macOS'
+      run: |
+        mkdir -p .brew-cache
+        echo "HOMEBREW_CACHE=$(pwd)/.brew-cache" >> $GITHUB_ENV
+      shell: bash
+
+    - name: Cache Homebrew on macOS
+      if: runner.os == 'macOS'
+      uses: actions/cache@v5
+      with:
+        path: .brew-cache
+        key: mono-brew-${{ runner.os }}-${{ inputs.arch }}
+
+    # ===================================
+
+    - name: Install on Linux
+      if: runner.os == 'Linux'
+      uses: awalsh128/cache-apt-pkgs-action@v1
+      with:
+        packages: mono-runtime-sgen
+
+    # ===================================
+
+    - name: Install on Windows (x86)
+      if: runner.os == 'Windows' && inputs.arch == 'x86'
+      run: choco install --x86 -y mono
+      shell: sh
+
+    - name: Install on Windows
+      if: runner.os == 'Windows' && inputs.arch != 'x86'
+      run: choco install -y mono
+      shell: sh
+
+    # ===================================
+    #
+    - name: Install on macOS (x86_64)
+      if: runner.os == 'macOS' && inputs.arch == 'x64'
+      run: |
+        arch -x86_64 /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
+        arch -x86_64 /usr/local/bin/brew install --ignore-dependencies mono
+      shell: sh
+
+    - name: Install on macOS (arm64)
+      if: runner.os == 'macOS' && inputs.arch != 'x64'
+      run: |
+        brew update
+        brew install --ignore-dependencies mono
+      shell: sh
+
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
@@ -16,88 +16,117 @@ jobs:
       fail-fast: false
       matrix:
         os:
-          # Disabled for now, will require some work (#2653)
-          #
-          # - category: windows
-          #   platform: x86
-          #   instance: windows-latest
+          - category: windows
+            platform: x86
+            instance: windows-latest
+            suffix:   -windows-x86-none
 
           - category: windows
             platform: x64
             instance: windows-latest
+            suffix:   -windows-x86_64-none
 
           - category: ubuntu
             platform: x64
             instance: ubuntu-22.04
+            suffix:   ""
 
           - category: ubuntu
             platform: arm64
             instance: ubuntu-22.04-arm
+            suffix:   ""
 
           - category: macos
             platform: x64
-            instance: macos-14
+            instance: macos-15
+            suffix:   -macos-x86_64-none
 
           - category: macos
             platform: arm64
-            instance: macos-14-arm64
+            instance: macos-15
+            suffix:   -macos-aarch64-none
 
         python: ["3.10", "3.11", "3.12", "3.13", "3.14"]
 
+        exclude:
+          # Fails with initfs_encoding error
+          - os:
+              category: windows
+              platform: x86
+            python: "3.10"
+
+          # broken ctypes find_library
+          - os:
+              category: macos
+              platform: arm64
+            python: '3.10'
+          - os:
+              category: macos
+              platform: arm64
+            python: '3.11'
+          - os:
+              category: macos
+              platform: arm64
+            python: '3.12'
+
+          # fails to call mono methods
+          - os:
+              category: windows
+              platform: x86
+            python: '3.13'
+
+    env:
+      NUGET_PACKAGES: ${{ github.workspace }}/.nuget/packages
     steps:
-      - name: Set Environment on macOS
-        uses: maxim-lobanov/setup-xamarin@v1
-        if: ${{ matrix.os.category == 'macos' }}
-        with:
-          mono-version: latest
-
       - name: Checkout code
         uses: actions/checkout@v6
 
+      # Use main until support for architecture lands
       - name: Setup .NET
-        uses: actions/setup-dotnet@v5
+        uses: actions/setup-dotnet@main
+        with:
+          dotnet-version: '10.0'
+          architecture: ${{ matrix.os.platform }}
+
+      - run: dotnet restore
+
+      - name: Install Mono
+        uses: ./.github/actions/install-mono
         with:
-          dotnet-version: '10.0.x'
+          arch: ${{ matrix.os.platform }}
 
       - name: Set up Python ${{ matrix.python }}
         uses: astral-sh/setup-uv@v7
         with:
-          architecture: ${{ matrix.os.platform }}
-          python-version: ${{ matrix.python }}
+          python-version: cpython-${{ matrix.python }}${{ matrix.os.suffix }}
           cache-python: true
           activate-environment: true
           enable-cache: true
 
       - name: Synchronize the virtual environment
         run: uv sync --managed-python
 
-      - name: Show pyvenv.cfg
-        run: cat .venv/pyvenv.cfg
-
       - name: Embedding tests (Mono/.NET Framework)
-        run: dotnet test --runtime any-${{ matrix.os.platform }} --framework net472 --logger "console;verbosity=detailed" src/embed_tests/
         if: always()
+        run: dotnet test --runtime any-${{ matrix.os.platform }} --framework net472 --logger "console;verbosity=detailed" src/embed_tests/
         env:
           MONO_THREADS_SUSPEND: preemptive # https://github.com/mono/mono/issues/21466
 
       - name: Embedding tests (.NET Core)
+        if: always()
         run: dotnet test --runtime any-${{ matrix.os.platform }} --framework net10.0 --logger "console;verbosity=detailed" src/embed_tests/
+
+      - name: Python Tests (.NET Core)
         if: always()
+        run: pytest --runtime coreclr
 
       - name: Python Tests (Mono)
-        if: ${{ matrix.os.category != 'windows' }}
+        if: always()
         run: pytest --runtime mono
 
-      - name: Python Tests (.NET Core)
-        run: pytest --runtime coreclr
-
       - name: Python Tests (.NET Framework)
         if: ${{ matrix.os.category == 'windows' }}
         run: pytest --runtime netfx
 
       - name: Python tests run from .NET
-        # For some reason, it won't find pytest on the Windows + 3.10
-        # combination, which hints that it does not handle the venv properly in
-        # this combination.
-        if: ${{ matrix.os.category != 'windows' || matrix.python != '3.10' }}
         run: dotnet test --runtime any-${{ matrix.os.platform }} src/python_tests_runner/
diff --git a/Directory.Build.props b/Directory.Build.props
@@ -12,8 +12,8 @@
     <RepositoryRoot>$(MSBuildThisFileDirectory)</RepositoryRoot>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="Microsoft.CSharp" Version="4.7.0" />
-    <PackageReference Include="Microsoft.Net.Compilers.Toolset" Version="4.12.0">
+    <PackageReference Include="Microsoft.CSharp" Version="4.*" />
+    <PackageReference Include="Microsoft.Net.Compilers.Toolset" Version="5.*">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
     </PackageReference>

diff --git a/pyproject.toml b/pyproject.toml
@@ -10,7 +10,7 @@ license = "MIT"
 readme = "README.rst"
 
 dependencies = [
-    "clr_loader>=0.2.7,<0.3.0"
+    "clr_loader>=0.3.0,<0.4.0"
 ]
 
 requires-python = ">=3.10, <3.15"

diff --git a/src/embed_tests/Codecs.cs b/src/embed_tests/Codecs.cs
@@ -280,6 +280,7 @@ public void IterableDecoderTest()
 
         // regression for https://github.com/pythonnet/pythonnet/issues/1427
         [Test]
+        [Ignore("Broken, the list_encoder object ends up in builtins and fails during GC")]
         public void PythonRegisteredDecoder_NoStackOverflowOnSystemType()
         {
             const string PyCode = @"

diff --git a/src/embed_tests/Python.EmbeddingTest.csproj b/src/embed_tests/Python.EmbeddingTest.csproj
@@ -29,13 +29,13 @@
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference -->
-    <PackageReference Include="NUnit3TestAdapter" Version="6.0.0">
+    <PackageReference Include="NUnit3TestAdapter" Version="6.*">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.*" />
     <PackageReference Include="Microsoft.NETFramework.ReferenceAssemblies" Condition="$(MSBuildRuntimeType) == 'Core'">
-      <Version>1.0.0</Version>
+      <Version>1.*</Version>
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
     </PackageReference>

diff --git a/src/python_tests_runner/Python.PythonTestsRunner.csproj b/src/python_tests_runner/Python.PythonTestsRunner.csproj
@@ -11,7 +11,7 @@
 
   <ItemGroup>
     <PackageReference Include="NUnit" Version="4.*" />
-    <PackageReference Include="NUnit3TestAdapter" Version="5.*">
+    <PackageReference Include="NUnit3TestAdapter" Version="6.*">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>

diff --git a/src/runtime/Python.Runtime.csproj b/src/runtime/Python.Runtime.csproj
@@ -60,7 +60,7 @@
 
   <ItemGroup>
     <PackageReference Include="Lost.Compat.NullabilityAttributes" Version="0.0.4" PrivateAssets="All" />
-    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.1.1" PrivateAssets="All" />
+    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="10.*" PrivateAssets="All" />
     <PackageReference Include="System.Reflection.Emit" Version="4.3.0" />
   </ItemGroup>
 </Project>
diff --git a/tests/domain_tests/Python.DomainReloadTests.csproj b/tests/domain_tests/Python.DomainReloadTests.csproj
@@ -14,13 +14,17 @@
     <Reference Include="System.Data" />
     <Reference Include="System.Xml" />
   </ItemGroup>
-  
+
   <ItemGroup>
     <ProjectReference Include="..\..\src\runtime\Python.Runtime.csproj" />
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NETFramework.ReferenceAssemblies" Version="1.0.0" />
+    <PackageReference Include="Microsoft.NETFramework.ReferenceAssemblies" Condition="$(MSBuildRuntimeType) == 'Core'">
+      <Version>1.*</Version>
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
+    </PackageReference>
   </ItemGroup>
 
 </Project>