diff --git a/requirements.txt b/requirements.txt
index 198af45..33f17fc 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -13,7 +13,7 @@ oauth2client==4.1.3
 
 # Adafruit PN532 NFC/RFID reader
 adafruit-circuitpython-pn532==2.4.8
-adafruit-blinka==8.47.0
+adafruit-blinka==9.1.0
 
 # Required by Adafruit libraries (transitive dependencies)
 adafruit-circuitpython-busdevice==5.2.16