diff --git a/requirements.txt b/requirements.txt
index 5571b16..6ac8bc8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,3 +5,4 @@
 Adafruit-Blinka>=7.0.0
 pyasn1
 adafruit-circuitpython-logging>=4.0.0
+adafruit-circuitpython-hashlib