diff --git a/teuthology/lock/cli.py b/teuthology/lock/cli.py
index c562a3d51..e5f97fb63 100644
--- a/teuthology/lock/cli.py
+++ b/teuthology/lock/cli.py
@@ -133,7 +133,7 @@ def main(ctx):
                 for s in sorted(statuses, key=lambda s: s.get('name')):
                     locked = 'unlocked' if s['locked'] == 0 else 'locked'
                     up = 'up' if s['up'] else 'down'
-                    mo = re.match('\w+@(\w+?)\..*', s['name'])
+                    mo = re.match(r'\w+@(\w+?)\..*', s['name'])
                     host = mo.group(1) if mo else s['name']
                     print(node_status_template.format(
                         up=up, locked=locked, host=host,
diff --git a/teuthology/task/kernel.py b/teuthology/task/kernel.py
index ca4718784..59242d31b 100644
--- a/teuthology/task/kernel.py
+++ b/teuthology/task/kernel.py
@@ -1033,7 +1033,7 @@ def get_image_version(remote, path):
         raise UnsupportedPackageTypeError(remote)
 
     for file in files.split('\n'):
-        match = re.search('/lib/modules/(.*)/modules\.order$', file)
+        match = re.search(r'/lib/modules/(.*)/modules\.order$', file)
         if match:
             version = match.group(1)
             break
diff --git a/teuthology/task/mpi.py b/teuthology/task/mpi.py
index 6c709fd17..0e1b504dd 100644
--- a/teuthology/task/mpi.py
+++ b/teuthology/task/mpi.py
@@ -18,7 +18,7 @@ def _check_mpi_version(remotes):
     for remote in remotes:
         version_str = remote.sh("mpiexec --version")
         try:
-            version = re.search("^\s+Version:\s+(.+)$", version_str, re.MULTILINE).group(1)
+            version = re.search(r"^\s+Version:\s+(.+)$", version_str, re.MULTILINE).group(1)
         except AttributeError:
             raise RuntimeError("Malformed MPI version output: {0}".format(version_str))
         else:
diff --git a/teuthology/task/ssh_keys.py b/teuthology/task/ssh_keys.py
index 9c899e8fa..0f497ebe9 100644
--- a/teuthology/task/ssh_keys.py
+++ b/teuthology/task/ssh_keys.py
@@ -54,7 +54,7 @@ def particular_ssh_key_test(line_to_test, ssh_key):
     """
     Check the validity of the ssh_key
     """
-    match = re.match('[\w-]+ {key} \S+@\S+'.format(key=re.escape(ssh_key)), line_to_test)
+    match = re.match(r'[\w-]+ {key} \S+@\S+'.format(key=re.escape(ssh_key)), line_to_test)
 
     if match:
         return False
@@ -65,7 +65,7 @@ def ssh_keys_user_line_test(line_to_test, username ):
     """
     Check the validity of the username
     """
-    match = re.match('[\w-]+ \S+ {username}@\S+'.format(username=username), line_to_test)
+    match = re.match(r'[\w-]+ \S+ {username}@\S+'.format(username=username), line_to_test)
 
     if match:
         return False
diff --git a/teuthology/timer.py b/teuthology/timer.py
index 0119b8b3a..9ca5d76a7 100644
--- a/teuthology/timer.py
+++ b/teuthology/timer.py
@@ -2,7 +2,7 @@
 import time
 import yaml
 
-from datetime import datetime
+import datetime
 
 log = logging.getLogger(__name__)
 
@@ -68,8 +68,8 @@ def get_datetime_string(self, time):
 
         :param time: Time in seconds; like from time.time()
         """
-        _datetime = datetime.utcfromtimestamp(time)
-        return datetime.strftime(
+        _datetime = datetime.datetime.fromtimestamp(time, datetime.timezone.utc)
+        return datetime.datetime.strftime(
             _datetime,
             self.datetime_format,
         )
diff --git a/teuthology/util/scanner.py b/teuthology/util/scanner.py
index b67d88c92..421d5a028 100644
--- a/teuthology/util/scanner.py
+++ b/teuthology/util/scanner.py
@@ -130,7 +130,7 @@ def __init__(self, remote=None) -> None:
 
     def _parse(self, file_content: str) -> Tuple[Optional[str], Optional[dict]]:
         xml_tree = etree.fromstring(file_content)
-        if not xml_tree:
+        if xml_tree is None:
             return None, None
         
         error_tree = xml_tree.find('error')