diff --git a/requirements.txt b/requirements.txt
index 247c98d3da660b6cbe64bd5d035d792cc87bf9ee..b604ac73fa0fef0ddedb49b9550969d49a09af71 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,6 +5,7 @@ Adafruit-Blinka==3.2.0
 adafruit-circuitpython-ads1x15==2.1.1
 adafruit-circuitpython-busdevice==4.0.1
 Adafruit-PlatformDetect==1.3.8
+adafruit-circuitpython-tca9548a==0.5.1
 Adafruit-PureIO==1.0.4
 numpy==1.17.4
 pandas==0.25.3