diff --git a/src/sysdiagnose/utils/jsonlogger.py b/src/sysdiagnose/utils/jsonlogger.py
index 2036087..c9e99f6 100644
--- a/src/sysdiagnose/utils/jsonlogger.py
+++ b/src/sysdiagnose/utils/jsonlogger.py
@@ -6,4 +6,4 @@ class SysdiagnoseJsonFormatter(jsonlogger.JsonFormatter):
     '''Custom JSON logger formatter '''
     # https://stackoverflow.com/questions/50873446/python-logger-output-dates-in-is8601-format
     def formatTime(self, record, datefmt=None):
-        return datetime.fromtimestamp(record.created).astimezone().isoformat(timespec='milliseconds')
+        return datetime.fromtimestamp(record.created).astimezone().isoformat(timespec='microseconds')