diff --git a/.github/workflows/linux_builds.yml b/.github/workflows/linux_builds.yml
index 193942a1bb3..6b786a7b584 100644
--- a/.github/workflows/linux_builds.yml
+++ b/.github/workflows/linux_builds.yml
@@ -140,6 +140,18 @@ jobs:
           python-version: 3.8
           scons-version: 4.0
 
+      - name: Force remove preinstalled .NET SDKs
+        if: matrix.build-mono
+        run: |
+          sudo rm -rf /usr/share/dotnet/sdk/*
+
+      - name: Setup older .NET SDK as baseline
+        if: matrix.build-mono
+        uses: actions/setup-dotnet@v4
+        with:
+          # Targeting the oldest version we want to support to ensure it still builds.
+          dotnet-version: '8.0.100'
+
       - name: Compilation
         uses: ./.github/actions/godot-build
         with:
@@ -163,6 +175,7 @@ jobs:
       - name: Build .NET solutions
         if: matrix.build-mono
         run: |
+          dotnet --info
           ./modules/mono/build_scripts/build_assemblies.py --godot-output-dir=./bin --godot-platform=linuxbsd
 
       - name: Prepare artifact
diff --git a/modules/mono/glue/GodotSharp/Godot.SourceGenerators.Internal/Godot.SourceGenerators.Internal.csproj b/modules/mono/glue/GodotSharp/Godot.SourceGenerators.Internal/Godot.SourceGenerators.Internal.csproj
index ee607ff279e..d291199ad04 100644
--- a/modules/mono/glue/GodotSharp/Godot.SourceGenerators.Internal/Godot.SourceGenerators.Internal.csproj
+++ b/modules/mono/glue/GodotSharp/Godot.SourceGenerators.Internal/Godot.SourceGenerators.Internal.csproj
@@ -8,7 +8,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.9.2" PrivateAssets="all" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.8.0" PrivateAssets="all" />
     <PackageReference Include="Microsoft.CodeAnalysis.Analyzers" Version="3.3.4" PrivateAssets="all" />
   </ItemGroup>