What worked for me was:
android list sdk -a
Which showed me the following list:
1- Android SDK Tools, revision 24.0.2
2- Android SDK Platform-tools, revision 21
3- Android SDK Build-tools, revision 21.1.2
4- Android SDK Build-tools, revision 21.1.1
5- Android SDK Build-tools, revision 21.1
6- Android SDK Build-tools, revision 21.0.2
7- Android SDK Build-tools, revision 21.0.1
... and a great many more
Followed by the command:
android update sdk -a -u -t 3
The “3” in the command refers the the index listed in the output of the first command.