diff --git a/src/TestableHttpClient/TestableHttpClient.csproj b/src/TestableHttpClient/TestableHttpClient.csproj
index 35bea58e..f4e53fd6 100644
--- a/src/TestableHttpClient/TestableHttpClient.csproj
+++ b/src/TestableHttpClient/TestableHttpClient.csproj
@@ -32,8 +32,8 @@
   </PropertyGroup>
 
   <ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.0'">
-    <PackageReference Include="System.Text.Json" Version="4.7.2" />
-    <PackageReference Include="System.Text.Encodings.Web" Version="4.7.2" />
+    <PackageReference Include="System.Text.Json" Version="10.0.0" />
+    <PackageReference Include="System.Text.Encodings.Web" Version="10.0.0" />
     <PackageReference Include="Perfors.UnreachableException" Version="1.0.0" />
     <PackageReference Include="PolyKit.Embedded" Version="3.0.9" />
   </ItemGroup>