diff --git a/samples/Catalog.Api/Catalog.Api.csproj b/samples/Catalog.Api/Catalog.Api.csproj
index 4651e22..6b7788f 100644
--- a/samples/Catalog.Api/Catalog.Api.csproj
+++ b/samples/Catalog.Api/Catalog.Api.csproj
@@ -17,6 +17,7 @@
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
     <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" />
+    <PackageReference Include="Microsoft.OpenApi" />
   </ItemGroup>
 
 </Project>
diff --git a/samples/Orders.Api/Orders.Api.csproj b/samples/Orders.Api/Orders.Api.csproj
index 0dbbe81..0f3ce60 100644
--- a/samples/Orders.Api/Orders.Api.csproj
+++ b/samples/Orders.Api/Orders.Api.csproj
@@ -14,6 +14,7 @@
   </PropertyGroup>
 
   <ItemGroup>
+    <PackageReference Include="Microsoft.OpenApi" />
     <PackageReference Include="Swashbuckle.AspNetCore" />
     <PackageReference Include="Microsoft.Extensions.ApiDescription.Server">
       <PrivateAssets>all</PrivateAssets>