diff --git a/SampleAuthServer/SampleAuthServer.csproj b/SampleAuthServer/SampleAuthServer.csproj
index 229f536..768f428 100644
--- a/SampleAuthServer/SampleAuthServer.csproj
+++ b/SampleAuthServer/SampleAuthServer.csproj
@@ -9,7 +9,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="IdentityServer4" Version="2.4.0" />
+    <PackageReference Include="IdentityServer4" Version="4.1.2" />
     <PackageReference Include="Microsoft.AspNetCore.All" Version="2.0.9" />
   </ItemGroup>