diff --git a/csharp/ContentfulWebhookVerification.csproj b/csharp/ContentfulWebhookVerification.csproj
index 16fdc32..36a4c14 100644
--- a/csharp/ContentfulWebhookVerification.csproj
+++ b/csharp/ContentfulWebhookVerification.csproj
@@ -10,7 +10,7 @@
     <PackageReference Include="Microsoft.AspNetCore.Mvc" Version="2.2.0" />
     <PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="8.0.11" />
     <PackageReference Include="Swashbuckle.AspNetCore" Version="6.6.2" />
-    <PackageReference Include="System.Text.Json" Version="8.0.5" />
+    <PackageReference Include="System.Text.Json" Version="9.0.4" />
   </ItemGroup>
 
 </Project>