diff --git a/src/Core/Core.csproj b/src/Core/Core.csproj
index f5659acfca..484d2cb6a1 100644
--- a/src/Core/Core.csproj
+++ b/src/Core/Core.csproj
@@ -37,7 +37,7 @@
     <PackageReference Include="Braintree" Version="4.5.0" />
     <PackageReference Include="Sendgrid" Version="9.10.0" />
     <PackageReference Include="Stripe.net" Version="19.9.2" />
-    <PackageReference Include="U2F.Core" Version="2.0.0" />
+    <PackageReference Include="U2F.Core" Version="1.0.4" />
     <PackageReference Include="Otp.NET" Version="1.2.0" />
     <PackageReference Include="YubicoDotNetClient" Version="1.2.0" />
   </ItemGroup>