Unable to update High Sierra to 10.13.6
please i need help I tried updating my macbook pro macOS High Sierra version 10.13.4 to version 10.13.6 but when ever the update is done it show the to update again and also when I click update the update starts with 379mb which quite not normal, I tried updating it over and over but the problem keeps resisting
[Re-Titled by Host]MacBook Pro, iOS 10.3