diff --git a/requirements-sbc.txt b/requirements-sbc.txt
index 40d7828..c568ee6 100644
--- a/requirements-sbc.txt
+++ b/requirements-sbc.txt
@@ -11,4 +11,4 @@ gpiozero==1.5.1
 rpi-piusv==0.1.0
 
 # Required for LoRaWAN.
-pycryptodome==3.10.1
+pycrypto==2.6.1
diff --git a/setup.py b/setup.py
index 4c4607b..a96c973 100644
--- a/setup.py
+++ b/setup.py
@@ -57,7 +57,7 @@
     ],
     'lorawan': [
         # Required for LoRaWAN.
-        'pycryptodome==3.10.1',
+        'pycrypto==2.6.1',
     ],
 
     # Victron Energy VE.Direct text protocol driver.