diff --git a/checkbox-ng/checkbox_ng/utils.py b/checkbox-ng/checkbox_ng/utils.py
index 44f816931e..c5f86aa5f4 100644
--- a/checkbox-ng/checkbox_ng/utils.py
+++ b/checkbox-ng/checkbox_ng/utils.py
@@ -60,7 +60,9 @@ def generate_resume_candidate_description(candidate):
     last_job_id = candidate.metadata.running_job_name or "Unknown"
     last_job_timestamp = candidate.metadata.last_job_start_time or None
     if last_job_timestamp:
-        dt = datetime.datetime.fromtimestamp(last_job_timestamp, datetime.UTC)
+        dt = datetime.datetime.fromtimestamp(
+            last_job_timestamp, datetime.timezone.utc
+        )
         last_job_start_time = dt.strftime("%Y-%m-%d %H:%M:%S")
     else:
         last_job_start_time = "Unknown"
diff --git a/checkbox-ng/plainbox/impl/exporter/jinja2.py b/checkbox-ng/plainbox/impl/exporter/jinja2.py
index 7a62afc973..b67dfe18c9 100644
--- a/checkbox-ng/plainbox/impl/exporter/jinja2.py
+++ b/checkbox-ng/plainbox/impl/exporter/jinja2.py
@@ -104,7 +104,7 @@ def __init__(
         self._system_id = system_id
         # Generate a time-stamp if needed
         self._timestamp = timestamp or datetime.datetime.now(
-            datetime.UTC
+            datetime.timezone.utc
         ).strftime("%Y-%m-%dT%H:%M:%S")
         # Use current version unless told otherwise
         self._client_version = client_version or get_version_string()
diff --git a/checkbox-ng/plainbox/impl/runner.py b/checkbox-ng/plainbox/impl/runner.py
index 87f4491145..bcb21ab86c 100644
--- a/checkbox-ng/plainbox/impl/runner.py
+++ b/checkbox-ng/plainbox/impl/runner.py
@@ -62,7 +62,7 @@ def on_begin(self, args, kwargs):
 
         Begins tracking time (relative time entries)
         """
-        self.last_msg = datetime.datetime.now(datetime.UTC)
+        self.last_msg = datetime.datetime.now(datetime.timezone.utc)
 
     def on_line(self, stream_name, line):
         """
@@ -72,7 +72,7 @@ def on_line(self, stream_name, line):
         Maintains a timestamp of the last message so that approximate delay
         between each piece of output can be recorded as well.
         """
-        now = datetime.datetime.now(datetime.UTC)
+        now = datetime.datetime.now(datetime.timezone.utc)
         delay = now - self.last_msg
         self.last_msg = now
         record = IOLogRecord(delay.total_seconds(), stream_name, line)
diff --git a/checkbox-ng/plainbox/impl/session/storage.py b/checkbox-ng/plainbox/impl/session/storage.py
index 6654953b8a..18b6a63162 100644
--- a/checkbox-ng/plainbox/impl/session/storage.py
+++ b/checkbox-ng/plainbox/impl/session/storage.py
@@ -233,7 +233,9 @@ def create(cls, prefix="pbox-"):
         WellKnownDirsHelper.populate_base()
 
         isoformat = "%Y-%m-%dT%H.%M.%S"
-        timestamp = datetime.datetime.now(datetime.UTC).strftime(isoformat)
+        timestamp = datetime.datetime.now(datetime.timezone.utc).strftime(
+            isoformat
+        )
         session_id = "{prefix}{timestamp}".format(
             prefix=slugify(prefix), timestamp=timestamp
         )