diff --git a/.travis.yml b/.travis.yml
index 805698e44..e092a0afb 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,9 +4,10 @@ python:
   - "2.6"
   - "2.7"
   - "3.3"
+  - "3.4"
 install:
     - python setup.py -q install
 script:
-    - if [[ "$(python -c 'import sys; print sys.version_info[:2]')" == "(2, 6)" ]]; then pip install unittest2; fi
+    - if [[ "$(python -c 'import sys; print(sys.version_info[:2])')" == "(2, 6)" ]]; then pip install unittest2; fi
     - py.test --tb=native jsonschema
     - python -m doctest README.rst
diff --git a/jsonschema/tests/test_cli.py b/jsonschema/tests/test_cli.py
index 3f43dedfc..dcc1efc61 100644
--- a/jsonschema/tests/test_cli.py
+++ b/jsonschema/tests/test_cli.py
@@ -22,10 +22,16 @@ class TestParser(unittest.TestCase):
     FakeValidator = fake_validator()
 
     def setUp(self):
-        self.open = mock.mock_open(read_data='{}')
-        patch = mock.patch.object(cli, "open", self.open, create=True)
-        patch.start()
-        self.addCleanup(patch.stop)
+        mock_open = mock.mock_open()
+        patch_open = mock.patch.object(cli, "open", mock_open, create=True)
+        patch_open.start()
+        self.addCleanup(patch_open.stop)
+
+        mock_json_load = mock.Mock()
+        mock_json_load.return_value = {}
+        patch_json_load = mock.patch("json.load")
+        patch_json_load.start()
+        self.addCleanup(patch_json_load.stop)
 
     def test_find_validator_by_fully_qualified_object_name(self):
         arguments = cli.parse_args(