diff --git a/driverlog/processor/main.py b/driverlog/processor/main.py
index 1493a81..161b977 100644
--- a/driverlog/processor/main.py
+++ b/driverlog/processor/main.py
@@ -29,9 +29,7 @@ LOG = logging.getLogger(__name__)
 
 
 def _find_vote(review, ci_id):
-    """
-    Finds vote corresponding to ci_id
-    """
+    """Finds vote corresponding to ci_id."""
     for approval in (review['currentPatchSet'].get('approvals') or []):
         if approval['type'] not in ['Verified', 'VRIF']:
             continue
@@ -43,9 +41,7 @@ def _find_vote(review, ci_id):
 
 
 def find_ci_result(review_iterator, ci):
-    """
-    For a given stream of reviews finds result left by specified ci
-    """
+    """For a given stream of reviews finds result left by specified ci."""
 
     for review in review_iterator:
         review_url = review['url']
@@ -85,9 +81,7 @@ def find_ci_result(review_iterator, ci):
 
 
 def _get_release_by_branch(releases, branch):
-    """
-    Translates branch name into release_id
-    """
+    """Translates branch name into release_id."""
     release = branch.lower()
     if release.find('/') > 0:
         return release.split('/')[1]
@@ -96,8 +90,8 @@ def _get_release_by_branch(releases, branch):
 
 
 def update_drivers(drivers, releases):
-    """
-    Iterates all drivers and searches for results produced by their CIs
+    """Iterates all drivers and searches for results produced by their CIs.
+
     Returns True if info was updated
     """
     branches = [('stable/' + r['id'].lower()) for r in releases] + ['master']
diff --git a/test-requirements.txt b/test-requirements.txt
index 18f8ce1..a468217 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,4 +1,4 @@
-hacking>=0.8.0,<0.9
+hacking>=0.9.2,<0.10
 
 coverage>=3.6
 discover
diff --git a/tests/unit/test_main.py b/tests/unit/test_main.py
index f3ff1e1..efd82b8 100644
--- a/tests/unit/test_main.py
+++ b/tests/unit/test_main.py
@@ -14,12 +14,12 @@
 # limitations under the License.
 
 import json
-import memcache
-import mock
 
 from driverlog.processor import main
 from driverlog.processor import utils
 
+import memcache
+import mock
 import testtools
 
 
diff --git a/tox.ini b/tox.ini
index 8fdd644..4317824 100644
--- a/tox.ini
+++ b/tox.ini
@@ -34,7 +34,9 @@ commands = python setup.py build_sphinx
 [flake8]
 # E125 continuation line does not distinguish itself from next logical line
 # H404 multi line docstring should start with a summary
-ignore = E125,H404
+# E251 unexpected spaces around keyword / parameter equals
+# E714 test for object identity should be 'is not'
+ignore = E125,H404,E251,E714
 show-source = true
 builtins = _
 exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,tools,build