diff --git a/FluentAssertions.Mockly.v8/FluentAssertions.Mockly.v8.csproj b/FluentAssertions.Mockly.v8/FluentAssertions.Mockly.v8.csproj
index 8996aaf..cd5de1d 100644
--- a/FluentAssertions.Mockly.v8/FluentAssertions.Mockly.v8.csproj
+++ b/FluentAssertions.Mockly.v8/FluentAssertions.Mockly.v8.csproj
@@ -48,7 +48,7 @@
   </ItemGroup>
 
   <ItemGroup Condition=" '$(TargetFramework)' == 'net472' ">
-    <PackageReference Include="System.Text.Json" Version="8.0.6" />
+    <PackageReference Include="System.Text.Json" Version="9.0.18" />
   </ItemGroup>
 
   <PropertyGroup Condition=" '$(Configuration)' == 'Debug' ">