Why is sbt 0.13.9 reporting that it's 0.13.8?

Question

I downloaded and installed sbt-0.13.9.msi from the official sbt site. However it reports that it's actually 0.13.8:

>sbt --version
Java HotSpot(TM) 64-Bit Server VM warning: ignoring option MaxPermSize=256m; sup
port was removed in 8.0
sbt launcher version 0.13.8

sbt about reports the same thing:

>sbt about
Java HotSpot(TM) 64-Bit Server VM warning: ignoring option MaxPermSize=256m; support was removed in 8.0
[info] Loading global plugins from C:\Users\$USER$\.sbt\0.13\plugins
[info] Set current project to documents (in build file:/C:/Users/$USER$/Documents/)

[info] This is sbt 0.13.8
[info] The current project is {file:/C:/Users/$USER$/Documents/}documents 0.1-SNAPSHOT
[info] The current project is built against Scala 2.10.4
[info] Available Plugins: sbt.plugins.IvyPlugin, sbt.plugins.JvmPlugin, sbt.plugins.CorePlugin, sbt.plugins.JUnitXmlReportPlugin
[info] sbt, sbt plugins, and build definitions are using Scala 2.10.4

What am I doing wrong here? Or is this a bug?

Answer 1

sbt is set to 0.13.8 in your project configuration.

Your build.properties file probably contains the line sbt.version=0.13.8

If you want your project to be executed by version 0.13.9 simply update the value.