diff --git a/README.md b/README.md
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@@ -166,7 +166,7 @@ Only main chapters:
 ##### :black_small_square: Network
 
 <p>
-&nbsp;&nbsp; <a href="https://www.putty.org/"><b>PuTTY</b></a> - is an SSH and telnet client, developed originally by Simon Tatham.<br>
+&nbsp;&nbsp; <a href="https://www.chiark.greenend.org.uk/~sgtatham/putty/"><b>PuTTY</b></a> - is an SSH and telnet client, developed originally by Simon Tatham.<br>
 &nbsp;&nbsp; <a href="https://mosh.org/"><b>Mosh</b></a> - is a SSH wrapper designed to keep a SSH session alive over a volatile connection.<br>
 &nbsp;&nbsp; <a href="https://eternalterminal.dev/"><b>Eternal Terminal</b></a> - enables mouse-scrolling and tmux commands inside the SSH session.<br>
 &nbsp;&nbsp; <a href="https://nmap.org/"><b>nmap</b></a> - is a free and open source (license) utility for network discovery and security auditing.<br>