diff --git a/Dfe.PersonsApi.Client/Dfe.PersonsApi.Client.csproj b/Dfe.PersonsApi.Client/Dfe.PersonsApi.Client.csproj
index afac01a2f..947298372 100644
--- a/Dfe.PersonsApi.Client/Dfe.PersonsApi.Client.csproj
+++ b/Dfe.PersonsApi.Client/Dfe.PersonsApi.Client.csproj
@@ -25,7 +25,7 @@
     <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="8.0.0" />
     <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="8.0.1" />
     <PackageReference Include="Microsoft.Extensions.Http" Version="8.0.0" />
-    <PackageReference Include="Microsoft.Identity.Client" Version="4.61.3" />
+    <PackageReference Include="Microsoft.Identity.Client" Version="4.66.2" />
     <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
   </ItemGroup>