diff --git a/.travis.yml b/.travis.yml
index 74d12fc..90f17de 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,10 +1,11 @@
 language: python
+sudo: true
+dist: xenial
 python:
 - '2.7'
-- '3.4'
-- '3.5'
 - '3.6'
-- pypy
+- '3.7'
+- pypy3.5
 install:
 - pip install coveralls
 - pip install 'coverage<4'
diff --git a/setup.py b/setup.py
index f435962..41db631 100644
--- a/setup.py
+++ b/setup.py
@@ -43,8 +43,7 @@
         'Programming Language :: Python :: 2',
         'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.4',
-        'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
+        'Programming Language :: Python :: 3.7',
     ]
 )
diff --git a/tox.ini b/tox.ini
index 20c543a..7722ed8 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = flake8,py27,py34,py35,py36
+envlist = flake8,py27,py34,py35,py36,py37
 
 [flake8]
 ; E501: line too long (X > 79 characters)
@@ -35,3 +35,6 @@ basepython = python3.5
 
 [testenv:py36]
 basepython = python3.6
+
+[testenv:py37]
+basepython = python3.7
diff --git a/voluptuous/schema_builder.py b/voluptuous/schema_builder.py
index fa29b34..8d7a81a 100644
--- a/voluptuous/schema_builder.py
+++ b/voluptuous/schema_builder.py
@@ -898,7 +898,6 @@ def _iterate_object(obj):
         for key in slots:
             if key != '__dict__':
                 yield (key, getattr(obj, key))
-    raise StopIteration()
 
 
 class Msg(object):