We now build against .NET Framework 4.6.1 to enable support for TLS 1.2, to allow connections to new versions of dynamics CRM - see eg https://community.dynamics.com/365/financeandoperations/b/arbelatechnologiesblog/archive/2018/02/25/transport-layer-security-tls-1-2-connectivity-requirements-for-dynamics-365-online-v9