diff --git a/algorithm_exercises_csharp/algorithm_exercises_csharp.csproj b/algorithm_exercises_csharp/algorithm_exercises_csharp.csproj
index 98b5e69..ae62c59 100644
--- a/algorithm_exercises_csharp/algorithm_exercises_csharp.csproj
+++ b/algorithm_exercises_csharp/algorithm_exercises_csharp.csproj
@@ -21,7 +21,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.CodeAnalysis.NetAnalyzers" Version="8.0.0">
+    <PackageReference Include="Microsoft.CodeAnalysis.NetAnalyzers" Version="9.0.0">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>
diff --git a/algorithm_exercises_csharp_base/algorithm_exercises_csharp_base.csproj b/algorithm_exercises_csharp_base/algorithm_exercises_csharp_base.csproj
index 43d37d3..d377df9 100644
--- a/algorithm_exercises_csharp_base/algorithm_exercises_csharp_base.csproj
+++ b/algorithm_exercises_csharp_base/algorithm_exercises_csharp_base.csproj
@@ -24,7 +24,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.CodeAnalysis.NetAnalyzers" Version="8.0.0">
+    <PackageReference Include="Microsoft.CodeAnalysis.NetAnalyzers" Version="9.0.0">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>
diff --git a/algorithm_exercises_csharp_test/algorithm_exercises_csharp_test.csproj b/algorithm_exercises_csharp_test/algorithm_exercises_csharp_test.csproj
index 3e0d426..61c3f21 100644
--- a/algorithm_exercises_csharp_test/algorithm_exercises_csharp_test.csproj
+++ b/algorithm_exercises_csharp_test/algorithm_exercises_csharp_test.csproj
@@ -30,7 +30,7 @@
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>
-    <PackageReference Include="Microsoft.CodeAnalysis.NetAnalyzers" Version="8.0.0">
+    <PackageReference Include="Microsoft.CodeAnalysis.NetAnalyzers" Version="9.0.0">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>