diff --git a/salt/elastalert/files/modules/so/playbook-es.py b/salt/elastalert/files/modules/so/playbook-es.py
index c10a80f2c..ab2327ab7 100644
--- a/salt/elastalert/files/modules/so/playbook-es.py
+++ b/salt/elastalert/files/modules/so/playbook-es.py
@@ -17,7 +17,7 @@ class PlaybookESAlerter(Alerter):
     def alert(self, matches):
        for match in matches:
             today = strftime("%Y.%m.%d", gmtime())
-            timestamp = strftime("%Y-%m-%d"'T'"%H:%M:%S", gmtime())
+            timestamp = strftime("%Y-%m-%d"'T'"%H:%M:%S"'.000Z', gmtime())
             headers = {"Content-Type": "application/json"}
             payload = {"rule": { "name": self.rule['play_title'],"case_template": self.rule['play_id'],"uuid": self.rule['play_id'],"category": self.rule['rule.category']},"event":{ "severity": self.rule['event.severity'],"module": self.rule['event.module'],"dataset": self.rule['event.dataset'],"severity_label": self.rule['sigma_level']},"kibana_pivot": self.rule['kibana_pivot'],"soc_pivot": self.rule['soc_pivot'],"play_url": self.rule['play_url'],"sigma_level": self.rule['sigma_level'],"event_data": match, "@timestamp": timestamp}
             url = f"https://{self.rule['elasticsearch_host']}/so-playbook-alerts-{today}/_doc/"