diff --git a/tests/testcases.py b/tests/testcases.py
index 7f602bb55..13c24a928 100644
--- a/tests/testcases.py
+++ b/tests/testcases.py
@@ -10,7 +10,7 @@ class DockerClientTestCase(unittest.TestCase):
     @classmethod
     def setUpClass(cls):
         cls.client = Client(docker_url())
-        cls.client.pull('ubuntu')
+        cls.client.pull('ubuntu', tag='latest')
 
     def setUp(self):
         for c in self.client.containers(all=True):