diff --git a/crypto_dev_signer/encoding.py b/crypto_dev_signer/encoding.py
index 79d6532..dac0dc8 100644
--- a/crypto_dev_signer/encoding.py
+++ b/crypto_dev_signer/encoding.py
@@ -25,7 +25,7 @@ def private_key_to_address(pk, result_format='hex'):
     elif result_format == 'bytes':
         return z[:20]
     raise ValueError('invalid result format "{}"'.format(result_format))
-    
+
 
 def is_address(address_hex):
     try:
diff --git a/requirements.txt b/requirements.txt
index 1710871..fe01b7f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,8 @@
 psycopg2==2.8.6
 cryptography==3.2.1
 pysha3==1.0.2
-simple-rlp==0.1.2
+#simple-rlp==0.1.2
+rlp==2.0.1
 json-rpc==1.13.0
 confini~=0.3.6a3
 sqlalchemy==1.3.20