diff --git a/test-requirements.txt b/test-requirements.txt
index ef2a53d..15a745f 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -2,5 +2,5 @@
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
 
-hacking>=0.10.0,<0.11
+hacking>=3.0,<3.1.0 # Apache-2.0
 stestr>=2.0.0 # Apache-2.0
diff --git a/tests/test_titles.py b/tests/test_titles.py
index afe7f7a..5dd9982 100644
--- a/tests/test_titles.py
+++ b/tests/test_titles.py
@@ -84,7 +84,7 @@ class TestTitles(testtools.TestCase):
             if line.startswith("..") and "image::" in line:
                 continue
             # Allow lines which do not contain any whitespace
-            if re.match("\s*[^\s]+$", line):
+            if re.match(r"\s*[^\s]+$", line):
                 continue
             self.assertTrue(
                 len(line) < 80,