diff --git a/app_decoder.py b/app_decoder.py
index 10ebd5e..588a0b7 100755
--- a/app_decoder.py
+++ b/app_decoder.py
@@ -43,7 +43,7 @@ def find_preferences_xml():
 
 
 def save_key_to_pem(pfx_data, pfx_password):
-        private_key, certificate, additional_certificates = pkcs12.load_key_and_certificates(pfx_data, bytes.fromhex(pfx_password))
+        private_key, certificate, additional_certificates = pkcs12.load_key_and_certificates(pfx_data, bytes.fromhex(pfx_password),None)
         with open("public.pem", "wb") as f:
             f.write(certificate.public_bytes(encoding=serialization.Encoding.PEM))
 
diff --git a/requirements.txt b/requirements.txt
index 2bf40fa..2e64fe0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,7 @@
 paho-mqtt>=1.5.0
 dash>=1.18.0
 plotly>=4
-cryptography>=3.1
+cryptography>=3.0
 pandas
 oauth2_client
 requests