Github increases SSH requirements

Today I received the following error message when accessing my Github repository on a Windows computer:

Couldn’t agree a key exchange algorithm (available: curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521)

After a short research I discovered the reason for this:

The following cryptographic standards considered vulnerable are no longer supported since 22nd Farbruar 2018:

TLSv1/TLSv1.1: This applies to all HTTPS connections, including web, API, and Git connections to https://github.com and https://api.github.com.
diffie-hellman-group1-sha1: This applies to all SSH connections to github.com
diffie-hellman-group14-sha1: This applies to all SSH connections to github.com

If you have problems with authentication at github, you should update your git client software!