diff --git a/src/Parlance.CSharp.Analyzers/Parlance.CSharp.Analyzers.csproj b/src/Parlance.CSharp.Analyzers/Parlance.CSharp.Analyzers.csproj
index 16018c3..e6cd89a 100644
--- a/src/Parlance.CSharp.Analyzers/Parlance.CSharp.Analyzers.csproj
+++ b/src/Parlance.CSharp.Analyzers/Parlance.CSharp.Analyzers.csproj
@@ -25,7 +25,7 @@
          (the .NET SDK's csc), or they are silently disabled with CS9057. The .NET 10
          SDK ships Roslyn 5.0, so this stays at 4.12.0 for broad host compatibility —
          do not let dependabot bump it above the lowest supported Roslyn. -->
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.12.0" PrivateAssets="all" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="5.3.0" PrivateAssets="all" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/tests/Parlance.TestAnalyzer/Parlance.TestAnalyzer.csproj b/tests/Parlance.TestAnalyzer/Parlance.TestAnalyzer.csproj
index e8af603..bf57830 100644
--- a/tests/Parlance.TestAnalyzer/Parlance.TestAnalyzer.csproj
+++ b/tests/Parlance.TestAnalyzer/Parlance.TestAnalyzer.csproj
@@ -9,8 +9,8 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.CodeAnalysis.Analyzers" Version="3.3.4" PrivateAssets="all" />
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.12.0" PrivateAssets="all" />
+    <PackageReference Include="Microsoft.CodeAnalysis.Analyzers" Version="5.3.0-2.25625.1" PrivateAssets="all" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="5.3.0" PrivateAssets="all" />
   </ItemGroup>
 
 </Project>