diff --git a/plexpy/common.py b/plexpy/common.py
index 2c7ccbcc..50dc6f37 100644
--- a/plexpy/common.py
+++ b/plexpy/common.py
@@ -304,6 +304,7 @@ NOTIFICATION_PARAMETERS = [
              {'name': 'Server Version', 'type': 'str', 'value': 'server_version', 'description': 'The current version of your Plex Server.'},
              {'name': 'Server ID', 'type': 'str', 'value': 'server_machine_id', 'description': 'The unique identifier for your Plex Server.'},
              {'name': 'Action', 'type': 'str', 'value': 'action', 'description': 'The action that triggered the notification.'},
+             {'name': 'Week Number', 'type': 'int', 'value': 'week_number', 'description': 'The week number when the notfication was triggered.'},
              {'name': 'Datestamp', 'type': 'str', 'value': 'datestamp', 'description': 'The date (in date format) when the notification was triggered.'},
              {'name': 'Timestamp', 'type': 'str', 'value': 'timestamp', 'description': 'The time (in time format) when the notification was triggered.'},
              {'name': 'Unix Time', 'type': 'int', 'value': 'unixtime', 'description': 'The unix timestamp when the notification was triggered.'},
diff --git a/plexpy/newsletters.py b/plexpy/newsletters.py
index b5b12100..a8ccefed 100644
--- a/plexpy/newsletters.py
+++ b/plexpy/newsletters.py
@@ -308,7 +308,7 @@ class Newsletter(object):
     _TEMPLATE_MASTER = ''
     _TEMPLATE = ''
 
-    def __init__(self, config=None, email_config=None, start_date=None, week_number=None, end_date=None,
+    def __init__(self, config=None, email_config=None, start_date=None, end_date=None,
                  subject=None, body=None, message=None):
         self.config = self.set_config(config=config, default=self._DEFAULT_CONFIG)
         self.email_config = self.set_config(config=email_config, default=self._DEFAULT_EMAIL_CONFIG)
@@ -333,9 +333,6 @@ class Newsletter(object):
             except ValueError:
                 pass
 
-        if week_number is None:
-            self.week_number = int(datetime.date.today().strftime("%W"))
-
         if self.start_date is None:
             self.start_date = self.end_date.shift(days=-self.config['last_days']+1).floor('day')
 
diff --git a/plexpy/notification_handler.py b/plexpy/notification_handler.py
index 6242db34..5a124647 100644
--- a/plexpy/notification_handler.py
+++ b/plexpy/notification_handler.py
@@ -703,7 +703,6 @@ def build_media_notify_params(notify_action=None, session=None, timeline=None, m
         'tautulli_remote': plexpy.CONFIG.GIT_REMOTE,
         'tautulli_branch': plexpy.CONFIG.GIT_BRANCH,
         'tautulli_commit': plexpy.CURRENT_VERSION,
-        'week_number': int(datetime.date.today().strftime("%W")),
         'server_name': plexpy.CONFIG.PMS_NAME,
         'server_ip': plexpy.CONFIG.PMS_IP,
         'server_port': plexpy.CONFIG.PMS_PORT,
@@ -712,6 +711,7 @@ def build_media_notify_params(notify_action=None, session=None, timeline=None, m
         'server_platform': plexpy.CONFIG.PMS_PLATFORM,
         'server_version': plexpy.CONFIG.PMS_VERSION,
         'action': notify_action.lstrip('on_'),
+        'week_number': arrow.now().isocalendar()[1],
         'datestamp': arrow.now().format(date_format),
         'timestamp': arrow.now().format(time_format),
         'unixtime': int(time.time()),