diff --git a/app/SourceCodeRules/SourceCodeRules/SourceCodeRules.csproj b/app/SourceCodeRules/SourceCodeRules/SourceCodeRules.csproj
index 0a0944c81..6e8c73ca5 100644
--- a/app/SourceCodeRules/SourceCodeRules/SourceCodeRules.csproj
+++ b/app/SourceCodeRules/SourceCodeRules/SourceCodeRules.csproj
@@ -20,13 +20,13 @@
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
         </PackageReference>
         <!--
-            Never above the Roslyn of the .NET SDK we build with (see metadata.txt): the 9.0.1xx SDKs ship
-            Roslyn 4.12. Built against a newer one, the compiler skips these analyzers with CS9057. Raise
+            Never above the Roslyn of the .NET SDK we build with (see metadata.txt): the 10.0.1xx SDKs ship
+            Roslyn 5.0. Built against a newer one, the compiler skips these analyzers with CS9057. Raise
             both only together with the SDK feature band, with SourceGeneratedMappings, and with the Tests
             project.
         -->
-        <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.12.0" />
-        <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="4.12.0" />
+        <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="5.0.0" />
+        <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="5.0.0" />
     </ItemGroup>
 
 </Project>
diff --git a/app/SourceGeneratedMappings/SourceGeneratedMappings.csproj b/app/SourceGeneratedMappings/SourceGeneratedMappings.csproj
index d85c4bcfe..7d118d296 100644
--- a/app/SourceGeneratedMappings/SourceGeneratedMappings.csproj
+++ b/app/SourceGeneratedMappings/SourceGeneratedMappings.csproj
@@ -21,11 +21,11 @@
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
         </PackageReference>
         <!--
-            Never above the Roslyn of the .NET SDK we build with (see metadata.txt): the 9.0.1xx SDKs ship
-            Roslyn 4.12. Built against a newer one, the compiler skips this generator with CS9057, and the
+            Never above the Roslyn of the .NET SDK we build with (see metadata.txt): the 10.0.1xx SDKs ship
+            Roslyn 5.0. Built against a newer one, the compiler skips this generator with CS9057, and the
             generated namespaces such as AIStudio.Tools.PluginSystem.Assistants.Icons go missing. Raise it
             only together with the SDK feature band, with SourceCodeRules, and with the Tests project.
         -->
-        <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.12.0" />
+        <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="5.0.0" />
     </ItemGroup>
 </Project>
diff --git a/app/Tests/Tests.csproj b/app/Tests/Tests.csproj
index e9a2cca5e..8b115bef6 100644
--- a/app/Tests/Tests.csproj
+++ b/app/Tests/Tests.csproj
@@ -14,9 +14,9 @@
         <!--
             Held at the version the two analyzer projects build against, so that a test compiling a
             snippet uses the same Roslyn the analyzers themselves were written for. Raise all three
-            together, and never above the Roslyn of the .NET SDK in metadata.txt (4.12 for 9.0.1xx).
+            together, and never above the Roslyn of the .NET SDK in metadata.txt (5.0 for 10.0.1xx).
         -->
-        <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.12.0" />
+        <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="5.0.0" />
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.10.0" />
         <!--
             Pinned below 4.6.0 on purpose, verified by bisecting 4.4.0, 4.5.0, 4.5.1, 4.6.0 and 4.6.1