diff --git a/requirements.txt b/requirements.txt
index 4530e02..ed767aa 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -10,6 +10,6 @@ netifaces==0.11.0
 RPi.GPIO==0.7.0
 adafruit-blinka==6.10.0
 adafruit-circuitpython-busdevice==5.0.6
-adafruit-circuitpython-mcp230xx==2.4.6
+adafruit-circuitpython-mcp230xx==2.5.9
 Adafruit-PlatformDetect==3.13.3
 Adafruit-PureIO==1.1.8