diff --git a/dockercloud/__init__.py b/dockercloud/__init__.py
index 8bb6aa5..b660249 100644
--- a/dockercloud/__init__.py
+++ b/dockercloud/__init__.py
@@ -31,9 +31,11 @@
 basic_auth = auth.load_from_file("~/.docker/config.json")
 
 if os.environ.get('DOCKERCLOUD_USER') and os.environ.get('DOCKERCLOUD_PASS'):
-    basic_auth = base64.b64encode("%s:%s" % (os.environ.get('DOCKERCLOUD_USER'), os.environ.get('DOCKERCLOUD_PASS')))
+    creds = "%s:%s" % (os.environ.get('DOCKERCLOUD_USER'), os.environ.get('DOCKERCLOUD_PASS'))
+    basic_auth = base64.b64encode(creds.encode()).decode()
 if os.environ.get('DOCKERCLOUD_USER') and os.environ.get('DOCKERCLOUD_APIKEY'):
-    basic_auth = base64.b64encode("%s:%s" % (os.environ.get('DOCKERCLOUD_USER'), os.environ.get('DOCKERCLOUD_APIKEY')))
+    creds = "%s:%s" % (os.environ.get('DOCKERCLOUD_USER'), os.environ.get('DOCKERCLOUD_APIKEY'))
+    basic_auth = base64.b64encode(creds.encode()).decode()
 
 rest_host = os.environ.get("DOCKERCLOUD_REST_HOST") or 'https://cloud.docker.com/'
 stream_host = os.environ.get("DOCKERCLOUD_STREAM_HOST") or 'wss://ws.cloud.docker.com/'
diff --git a/dockercloud/api/auth.py b/dockercloud/api/auth.py
index 65d6668..d5987bd 100644
--- a/dockercloud/api/auth.py
+++ b/dockercloud/api/auth.py
@@ -12,9 +12,11 @@
 
 HUB_INDEX = "https://index.docker.io/v1/"
 
+
 def authenticate(username, password):
     verify_credential(username, password)
-    dockercloud.basic_auth = base64.b64encode("%s:%s" % (username, password))
+    cred = "%s:%s" % (username, password)
+    dockercloud.basic_auth = base64.b64encode(cred.encode())
 
 
 def verify_credential(username, password):
@@ -71,12 +73,14 @@ def load_from_file(f="~/.docker/config.json"):
 
 def get_auth_header():
     try:
-        dockercloud.basic_auth = base64.b64encode("%s:%s" % (dockercloud.user, dockercloud.password))
+        cred = "%s:%s" % (dockercloud.user, dockercloud.password)
+        dockercloud.basic_auth = base64.b64encode(cred.encode()).decode()
     except:
         pass
 
     try:
-        dockercloud.basic_auth = base64.b64encode("%s:%s" % (dockercloud.user, dockercloud.apikey))
+        cred = "%s:%s" % (dockercloud.user, dockercloud.apikey)
+        dockercloud.basic_auth = base64.b64encode(cred.encode()).decode()
     except:
         pass
 
diff --git a/dockercloud/api/http.py b/dockercloud/api/http.py
index f1d0696..ffd58ad 100644
--- a/dockercloud/api/http.py
+++ b/dockercloud/api/http.py
@@ -34,9 +34,9 @@ def new_session():
 
 def send_request(method, path, inject_header=True, **kwargs):
     json = None
-    url = urljoin(dockercloud.rest_host.rstrip("/"), path.strip("/").encode("ascii", "ignore"))
-    if not url.endswith("/"):
-        url = "%s/" % url
+    url = urljoin(dockercloud.rest_host.encode(), path.strip("/").encode())
+    if not url.endswith(b"/"):
+        url = b"%s/" % url
     user_agent = 'python-dockercloud/%s' % dockercloud.__version__
     if dockercloud.user_agent:
         user_agent = "%s %s" % (dockercloud.user_agent, user_agent)
diff --git a/requirements.txt b/requirements.txt
index fe172c4..8fe1f99 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,5 @@
 future==0.15.0
+mock==2.0.0
 requests==2.7.0
 six==1.9.0
 websocket-client==0.37.0
diff --git a/tests/test_action.py b/tests/test_action.py
index f5893a7..32255a3 100644
--- a/tests/test_action.py
+++ b/tests/test_action.py
@@ -1,8 +1,12 @@
 from __future__ import absolute_import
 
 import unittest
+import six
 
-import unittest.mock as mock
+if six.PY2:
+    import mock
+elif six.PY3:
+    import unittest.mock as mock
 
 import dockercloud
 from .fake_api import *
diff --git a/tests/test_auth.py b/tests/test_auth.py
index dd81a01..24ffa6b 100644
--- a/tests/test_auth.py
+++ b/tests/test_auth.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import
+from __future__ import absolute_import, print_function
 
 import os
 import tempfile
@@ -23,7 +23,7 @@ def tearDown(self):
     def test_auth_authenticate(self, mock_verify_credential):
         dockercloud.auth.authenticate(FAKE_USER, FAKE_PASSWORD)
         mock_verify_credential.assert_called_with(FAKE_USER, FAKE_PASSWORD)
-        self.assertEqual(dockercloud.basic_auth, FAKE_BASIC_AUTH)
+        self.assertEqual(dockercloud.basic_auth, FAKE_BASIC_AUTH.encode('latin-1'))
         self.tearDown()
 
     def test_auth_is_authenticated(self):
@@ -75,7 +75,7 @@ def test_auth_get_auth_header(self):
         dockercloud.basic_auth = FAKE_BASIC_AUTH
         self.assertEqual({'Authorization': FAKE_DOCKERCLOUD_AUTH}, dockercloud.auth.get_auth_header())
 
-        print "===================="
+        print("====================")
         dockercloud.dockercloud_auth = None
         dockercloud.basic_auth = FAKE_BASIC_AUTH
         self.assertEqual({'Authorization': 'Basic %s' % (FAKE_BASIC_AUTH)}, dockercloud.auth.get_auth_header())