diff --git a/monkey/common/cloud/aws_instance.py b/monkey/common/cloud/aws_instance.py
index 40d7c622c..e7d1b2361 100644
--- a/monkey/common/cloud/aws_instance.py
+++ b/monkey/common/cloud/aws_instance.py
@@ -1,6 +1,7 @@
 import json
 import re
-import urllib2
+import urllib.request
+import urllib.error
 import logging
 
 
@@ -25,18 +26,18 @@ class AwsInstance(object):
         self.account_id = None
 
         try:
-            self.instance_id = urllib2.urlopen(
+            self.instance_id = urllib.request.urlopen(
                 AWS_LATEST_METADATA_URI_PREFIX + 'meta-data/instance-id', timeout=2).read()
             self.region = self._parse_region(
-                urllib2.urlopen(AWS_LATEST_METADATA_URI_PREFIX + 'meta-data/placement/availability-zone').read())
-        except urllib2.URLError as e:
-            logger.debug("Failed init of AwsInstance while getting metadata: {}".format(e.message))
+                urllib.request.urlopen(AWS_LATEST_METADATA_URI_PREFIX + 'meta-data/placement/availability-zone').read())
+        except urllib.error.URLError as e:
+            logger.debug("Failed init of AwsInstance while getting metadata: {}".format(e))
 
         try:
             self.account_id = self._extract_account_id(
-                urllib2.urlopen(
+                urllib.request.urlopen(
                     AWS_LATEST_METADATA_URI_PREFIX + 'dynamic/instance-identity/document', timeout=2).read())
-        except urllib2.URLError as e:
+        except urllib.error.URLError as e:
             logger.debug("Failed init of AwsInstance while getting dynamic instance data: {}".format(e))
 
     @staticmethod
diff --git a/monkey/infection_monkey/model/victim_host_generator_test.py b/monkey/infection_monkey/model/victim_host_generator_test.py
index 102014d45..3a159f245 100644
--- a/monkey/infection_monkey/model/victim_host_generator_test.py
+++ b/monkey/infection_monkey/model/victim_host_generator_test.py
@@ -17,8 +17,8 @@ class VictimHostGeneratorTester(TestCase):
         generator = VictimHostGenerator(test_ranges, '10.0.0.1', [])
         victims = generator.generate_victims(chunk_size)
         for i in range(5):  # quickly check the equally sided chunks
-            self.assertEqual(len(victims.next()), chunk_size)
-        victim_chunk_last = victims.next()
+            self.assertEqual(len(next(victims)), chunk_size)
+        victim_chunk_last = next(victims)
         self.assertEqual(len(victim_chunk_last), 1)
 
     def test_remove_blocked_ip(self):
diff --git a/monkey/infection_monkey/network/network_scanner.py b/monkey/infection_monkey/network/network_scanner.py
index 1a3d615a5..50fd21b4d 100644
--- a/monkey/infection_monkey/network/network_scanner.py
+++ b/monkey/infection_monkey/network/network_scanner.py
@@ -85,7 +85,7 @@ class NetworkScanner(object):
                 return
 
             results = pool.map(self.scan_machine, victim_chunk)
-            resulting_victims = filter(lambda x: x is not None, results)
+            resulting_victims = [x for x in results if x is not None]
             for victim in resulting_victims:
                 LOG.debug("Found potential victim: %r", victim)
                 victims_count += 1
diff --git a/monkey/infection_monkey/transport/http.py b/monkey/infection_monkey/transport/http.py
index 6610e082d..eb1e5d355 100644
--- a/monkey/infection_monkey/transport/http.py
+++ b/monkey/infection_monkey/transport/http.py
@@ -3,7 +3,7 @@ import os.path
 import select
 import socket
 import threading
-import urllib.request, urllib.parse, urllib.error
+import urllib
 from logging import getLogger
 from urllib.parse import urlsplit
 
diff --git a/monkey/infection_monkey/utils/auto_new_user.py b/monkey/infection_monkey/utils/auto_new_user.py
index e749020d6..0a34d93c0 100644
--- a/monkey/infection_monkey/utils/auto_new_user.py
+++ b/monkey/infection_monkey/utils/auto_new_user.py
@@ -4,7 +4,7 @@ import abc
 logger = logging.getLogger(__name__)
 
 
-class AutoNewUser:
+class AutoNewUser(metaclass=abc.ABCMeta):
     """
     RAII object to use for creating and using a new user. Use with `with`.
     User will be created when the instance is instantiated.
@@ -19,7 +19,6 @@ class AutoNewUser:
         # Logged off and deleted
         ...
         """
-    __metaclass__ = abc.ABCMeta
 
     def __init__(self, username, password):
         self.username = username
diff --git a/monkey/monkey_island/requirements.txt b/monkey/monkey_island/requirements.txt
index ee66bb797..49c1e37a5 100644
--- a/monkey/monkey_island/requirements.txt
+++ b/monkey/monkey_island/requirements.txt
@@ -1,6 +1,6 @@
 bson
 python-dateutil
-tornado==5.1.1
+tornado
 werkzeug
 jinja2
 markupsafe
@@ -10,10 +10,9 @@ flask
 Flask-Pymongo
 Flask-Restful
 Flask-JWT
-jsonschema==2.6.0
+jsonschema
 netifaces
 ipaddress
-enum34
 pycryptodome
 boto3
 botocore