diff --git a/README.rst b/README.rst
index 4f3d8d0..b44d952 100644
--- a/README.rst
+++ b/README.rst
@@ -142,7 +142,7 @@ Manually canceling tracing will not clear any tracing already done - it will sim
 Further information
 ===================
 
-If you’re interested in learning more about the OpenTracing standard, please visit `opentracing.io`_ or `join the mailing list`_. If you would like to implement OpenTracing in your project and need help, feel free to send us a note at `community@opentracing.io`_.
+If you're interested in learning more about the OpenTracing standard, please visit `opentracing.io`_ or `join the mailing list`_. If you would like to implement OpenTracing in your project and need help, feel free to send us a note at `community@opentracing.io`_.
 
 .. _opentracing.io: http://opentracing.io/
 .. _join the mailing list: http://opentracing.us13.list-manage.com/subscribe?u=180afe03860541dae59e84153&id=19117aa6cd
diff --git a/setup.py b/setup.py
index 5e42d38..2c44404 100644
--- a/setup.py
+++ b/setup.py
@@ -15,8 +15,9 @@
     platforms='any',
     install_requires=[
         'sqlalchemy',
-        'opentracing>=1.1,<=1.3'
+        'opentracing'
     ],
+    tests_require=['pytest-cov'],
     classifiers=[
         'Intended Audience :: Developers',
         'License :: OSI Approved :: BSD License',
diff --git a/tests/test_api.py b/tests/test_api.py
index b15a35c..fe50d18 100644
--- a/tests/test_api.py
+++ b/tests/test_api.py
@@ -1,5 +1,5 @@
 import unittest
-from mock import patch
+from unittest.mock import patch
 from sqlalchemy import create_engine, MetaData, Table, Column, Integer, String
 from sqlalchemy.engine import Engine
 from sqlalchemy.exc import OperationalError
diff --git a/tests/test_core.py b/tests/test_core.py
index 9a1a2a7..b77e60c 100644
--- a/tests/test_core.py
+++ b/tests/test_core.py
@@ -163,7 +163,7 @@ def test_traced_transaction(self):
         self.assertEqual(True, all(map(lambda x: x.is_finished, tracer.spans)))
         self.assertEqual(True, all(map(lambda x: x.child_of == parent_span, tracer.spans)))
         self.assertEqual(['create_table', 'insert', 'select'],
-                         map(lambda x: x.operation_name, tracer.spans))
+                         list(map(lambda x: x.operation_name, tracer.spans)))
 
     def test_traced_transaction_nested(self):
         tracer = DummyTracer()
@@ -189,7 +189,7 @@ def test_traced_transaction_nested(self):
         self.assertEqual(True, all(map(lambda x: x.is_finished, tracer.spans)))
         self.assertEqual(True, all(map(lambda x: x.child_of == parent_span, tracer.spans)))
         self.assertEqual(['create_table', 'insert', 'select'],
-                         map(lambda x: x.operation_name, tracer.spans))
+                         list(map(lambda x: x.operation_name, tracer.spans)))
 
     def test_traced_rollback(self):
         tracer = DummyTracer()
@@ -216,9 +216,9 @@ def test_traced_rollback(self):
         self.assertEqual(True, all(map(lambda x: x.is_finished, tracer.spans)))
         self.assertEqual(True, all(map(lambda x: x.child_of == parent_span, tracer.spans)))
         self.assertEqual(['insert', 'create_table'],
-                         map(lambda x: x.operation_name, tracer.spans))
+                         list(map(lambda x: x.operation_name, tracer.spans)))
         self.assertEqual(['false', 'true'],
-                         map(lambda x: x.tags.get('error', 'false'), tracer.spans))
+                         list(map(lambda x: x.tags.get('error', 'false'), tracer.spans)))
 
     def test_traced_after_transaction(self):
         tracer = DummyTracer()
diff --git a/tests/test_orm.py b/tests/test_orm.py
index bed6ee2..a2dba22 100644
--- a/tests/test_orm.py
+++ b/tests/test_orm.py
@@ -262,7 +262,7 @@ def test_traced_bulk_insert(self):
         parent_span = DummySpan('parent')
         session = self.session
         sqlalchemy_opentracing.set_parent_span(session, parent_span)
-        users = [User(name = 'User-%s' % i) for i in xrange(10)]
+        users = [User(name = 'User-%s' % i) for i in range(10)]
         session.bulk_save_objects(users)
 
         self.assertEqual(1, len(tracer.spans))