diff --git a/mqtt-io/requirements.txt b/mqtt-io/requirements.txt
index 57954e4..799aa03 100644
--- a/mqtt-io/requirements.txt
+++ b/mqtt-io/requirements.txt
@@ -15,5 +15,5 @@ pifacedigitalio==3.0.5
 pyserial==3.5
 RPi.bme280==0.2.4
 RPi.GPIO==0.7.1
-smbus2==0.4.2
+smbus2==0.4.3
 w1thermsensor==2.0.0