diff --git a/usr/lib/python3.6/vmmgr/crypto.py b/usr/lib/python3.6/vmmgr/crypto.py
index 7d409bc..c3a90a9 100644
--- a/usr/lib/python3.6/vmmgr/crypto.py
+++ b/usr/lib/python3.6/vmmgr/crypto.py
@@ -8,7 +8,6 @@ from cryptography import x509
 from cryptography.hazmat.backends import default_backend
 from cryptography.hazmat.primitives import hashes, serialization
 from cryptography.hazmat.primitives.asymmetric import ec
-from cryptography.hazmat.primitives.serialization import load_pem_public_key
 from cryptography.x509.oid import NameOID, ExtendedKeyUsageOID
 
 CERT_PUB_FILE = '/etc/ssl/services.pem'
@@ -85,7 +84,7 @@ def get_cert_info():
 
 def verify_signature(file, signature):
     with open(SIG_PUB_FILE, 'rb') as f:
-        pub_key = load_pem_public_key(f.read(), default_backend())
+        pub_key = serialization.load_pem_public_key(f.read(), default_backend())
     pub_key.verify(packages_sig, packages, ec.ECDSA(hashes.SHA512()))
 
 def adminpwd_hash(password):
diff --git a/usr/lib/python3.6/vmmgr/wsgiapp.py b/usr/lib/python3.6/vmmgr/wsgiapp.py
index 3d3d589..079a4d5 100644
--- a/usr/lib/python3.6/vmmgr/wsgiapp.py
+++ b/usr/lib/python3.6/vmmgr/wsgiapp.py
@@ -3,11 +3,10 @@
 import json
 import os
 
-from werkzeug.exceptions import BadRequest, HTTPException, NotFound
+from werkzeug.exceptions import HTTPException, NotFound
 from werkzeug.routing import Map, Rule
 from werkzeug.utils import redirect
 from werkzeug.wrappers import Request, Response
-from werkzeug.wsgi import ClosingIterator
 from jinja2 import Environment, FileSystemLoader
 
 from cryptography.exceptions import InvalidSignature