diff --git a/Dockerfile.py3 b/Dockerfile.py3
new file mode 100644
index 0000000..3f9f12e
--- /dev/null
+++ b/Dockerfile.py3
@@ -0,0 +1,8 @@
+FROM python:3.5.3-alpine
+
+RUN apk update && apk add ca-certificates
+
+ADD . /sdk
+WORKDIR sdk
+RUN python setup.py install
+
diff --git a/docker-compose.test.yml b/docker-compose.test.yml
index f4d914a..f767563 100644
--- a/docker-compose.test.yml
+++ b/docker-compose.test.yml
@@ -1,3 +1,11 @@
-sut:
-  build: .
-  command: python setup.py test
+version: '3'
+services:
+  sut:
+    build: .
+    command: python setup.py test
+
+  sut-py3:
+    build: 
+      context: .
+      dockerfile: Dockerfile.py3
+    command: python setup.py test
diff --git a/dockercloud/__init__.py b/dockercloud/__init__.py
index 482dbc9..9715fba 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 ccfec44..eb4e88f 100644
--- a/dockercloud/api/auth.py
+++ b/dockercloud/api/auth.py
@@ -15,7 +15,8 @@
 
 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):
@@ -73,12 +74,14 @@ 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 7dd08bf..2db2bd3 100644
--- a/dockercloud/api/http.py
+++ b/dockercloud/api/http.py
@@ -16,7 +16,7 @@
 
 
 def get_session(time=time):
-    if (dockercloud.reconnection_interval >= 0):
+    if dockercloud.reconnection_interval is not None and (dockercloud.reconnection_interval >= 0):
         global last_connection_time
         if (time.time() - last_connection_time > dockercloud.reconnection_interval):
             new_session()
@@ -40,9 +40,9 @@ 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_auth.py b/tests/test_auth.py
index 6ce8ab5..48c6273 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
@@ -26,7 +26,7 @@ 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):