diff --git a/.travis.yml b/.travis.yml
index 971c9381..1aef9974 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,6 +2,9 @@ language: python
 
 matrix:
   include:
+    - python: 3.4
+      dist: trusty
+      sudo: false
     - python: 3.5
       dist: trusty
       sudo: false
diff --git a/plugins/Bigfile/BigfilePlugin.py b/plugins/Bigfile/BigfilePlugin.py
index 2fa2bc93..f05cebfd 100644
--- a/plugins/Bigfile/BigfilePlugin.py
+++ b/plugins/Bigfile/BigfilePlugin.py
@@ -6,6 +6,7 @@ import collections
 import math
 import warnings
 import base64
+import binascii
 
 import gevent
 import gevent.lock
@@ -66,7 +67,7 @@ class UiRequestPlugin(object):
             )
 
         if len(piecemap_info["sha512_pieces"]) == 1:  # Small file, don't split
-            hash = piecemap_info["sha512_pieces"][0].hex()
+            hash = binascii.hexlify(piecemap_info["sha512_pieces"][0].encode())
             hash_id = site.content_manager.hashfield.getHashId(hash)
             site.content_manager.optionalDownloaded(inner_path, hash_id, upload_info["size"], own=True)
 
diff --git a/plugins/Bigfile/Test/TestBigfile.py b/plugins/Bigfile/Test/TestBigfile.py
index f7ac604e..e424ec5c 100644
--- a/plugins/Bigfile/Test/TestBigfile.py
+++ b/plugins/Bigfile/Test/TestBigfile.py
@@ -1,5 +1,6 @@
 import time
 import io
+import binascii
 
 import pytest
 import mock
@@ -39,7 +40,7 @@ class TestBigfile:
         piecemap = Msgpack.unpack(site.storage.open(file_node["piecemap"], "rb").read())["optional.any.iso"]
         assert len(piecemap["sha512_pieces"]) == 10
         assert piecemap["sha512_pieces"][0] != piecemap["sha512_pieces"][1]
-        assert piecemap["sha512_pieces"][0].hex() == "a73abad9992b3d0b672d0c2a292046695d31bebdcb1e150c8410bbe7c972eff3"
+        assert binascii.hexlify(piecemap["sha512_pieces"][0].encode()) == b"a73abad9992b3d0b672d0c2a292046695d31bebdcb1e150c8410bbe7c972eff3"
 
     def testVerifyPiece(self, site):
         inner_path = self.createBigfile(site)
diff --git a/src/Config.py b/src/Config.py
index b13b1ac9..eb265871 100644
--- a/src/Config.py
+++ b/src/Config.py
@@ -13,7 +13,7 @@ class Config(object):
 
     def __init__(self, argv):
         self.version = "0.7.0"
-        self.rev = 4015
+        self.rev = 4016
         self.argv = argv
         self.action = None
         self.pending_changes = {}
diff --git a/src/User/User.py b/src/User/User.py
index b97bae86..2557abc0 100644
--- a/src/User/User.py
+++ b/src/User/User.py
@@ -1,6 +1,7 @@
 import logging
 import json
 import time
+import binascii
 
 import gevent
 
@@ -53,7 +54,7 @@ class User(object):
             self.delayed_save_thread = gevent.spawn_later(5, self.save)
 
     def getAddressAuthIndex(self, address):
-        return int(address.encode("ascii").hex(), 16)
+        return int(binascii.hexlify(address.encode()), 16)
 
     @util.Noparallel()
     def generateAuthAddress(self, address):