diff --git a/monasca_tempest_tests/tests/api/constants.py b/monasca_tempest_tests/tests/api/constants.py
index 0caf3b6..9146d78 100644
--- a/monasca_tempest_tests/tests/api/constants.py
+++ b/monasca_tempest_tests/tests/api/constants.py
@@ -21,7 +21,7 @@ ALARM_DEFINITION_CREATION_WAIT = 3
 MAX_METRIC_NAME_LENGTH = 255
 MAX_DIMENSION_KEY_LENGTH = 255
 MAX_DIMENSION_VALUE_LENGTH = 255
-INVALID_DIMENSION_CHARS = "<>={},\"\;&"
+INVALID_DIMENSION_CHARS = "<>={},\"\\;&"
 INVALID_NAME_CHARS = INVALID_DIMENSION_CHARS + "()"
 
 MAX_ALARM_DEFINITION_NAME_LENGTH = 255
@@ -31,7 +31,7 @@ MAX_ALARM_DEFINITION_ACTIONS_LENGTH = 50
 MAX_NOTIFICATION_METHOD_NAME_LENGTH = 250
 MAX_NOTIFICATION_METHOD_TYPE_LENGTH = 100
 MAX_NOTIFICATION_METHOD_ADDRESS_LENGTH = 512
-INVALID_CHARS_NOTIFICATION = "<>={}(),\"\;&"
+INVALID_CHARS_NOTIFICATION = "<>={}(),\"\\;&"
 
 MAX_LIST_MEASUREMENTS_NAME_LENGTH = 255
 
diff --git a/monasca_tempest_tests/tests/api/test_alarm_definitions.py b/monasca_tempest_tests/tests/api/test_alarm_definitions.py
index 6d0b4f8..af9c5a1 100644
--- a/monasca_tempest_tests/tests/api/test_alarm_definitions.py
+++ b/monasca_tempest_tests/tests/api/test_alarm_definitions.py
@@ -220,7 +220,7 @@ class TestAlarmDefinitions(base.BaseMonascaTest):
         alarm_def_name = data_utils.rand_name('monitoring_alarm')
         alarm_definition = helpers.create_alarm_definition(
             name=alarm_def_name,
-            expression="avg(mem_total_mb{dev=\\usr\local\bin}) gt 0",
+            expression="avg(mem_total_mb{dev=\\usr\local\bin}) gt 0", # noqa
             alarm_actions=[notification_id],
             ok_actions=[notification_id],
             undetermined_actions=[notification_id],
diff --git a/monasca_tempest_tests/tests/api/test_alarms_count.py b/monasca_tempest_tests/tests/api/test_alarms_count.py
index ac2de33..f9fcaf8 100644
--- a/monasca_tempest_tests/tests/api/test_alarms_count.py
+++ b/monasca_tempest_tests/tests/api/test_alarms_count.py
@@ -232,7 +232,7 @@ class TestAlarmsCount(base.BaseMonascaTest):
         resp, response_body = self.monasca_client.list_alarms()
         alarm_low_count = 0
         for alarm in response_body['elements']:
-            if alarm['state'] is 'ALARM' and alarm['severity'] is 'LOW':
+            if alarm['state'] == 'ALARM' and alarm.get('severity', '') == 'LOW':
                 alarm_low_count += 1
 
         # Using urlencode mimics the CLI behavior. Without the urlencode, falcon
diff --git a/test-requirements.txt b/test-requirements.txt
index 1b760eb..97b2d45 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -2,7 +2,7 @@
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
 
-hacking>=1.1.0,<1.2.0 # Apache-2.0
+hacking>=3.0,<3.1.0;python_version>='3.5' # Apache-2.0
 
 sphinx!=1.6.6,!=1.6.7,!=2.1.0,>=1.6.2 # BSD
 openstackdocstheme>=1.20.0 # Apache-2.0