diff --git a/registry.txt b/registry.txt
index 9956faf1..ef96692b 100644
--- a/registry.txt
+++ b/registry.txt
@@ -4293,3 +4293,4 @@ https://github.com/masadaruma/TB67H450-arduino-library.git|Contributed|TB67H450-
 https://github.com/Tinyu-Zhao/TFTTerminal.git|Contributed|TFTTerminal
 https://github.com/1452206376/CH9328-Keyboard.git|Contributed|CH9328-Keyboard
 https://github.com/cygig/DailyStruggleButton.git|Contributed|DailyStrugleButton
+https://github.com/9glt/arduino-attiny85-mcp23017-library.git|Contributed|MCP23017_Attiny85