我在项目中有build.properties文件，其中包含以下行：

sbt.version=1.2.8

build.properties文件与build.sbt文件位于同一文件夹中。
但是当我输入命令“sbt about”时，它会报告1.0.3。以下是命令的实际输出：

/Users/kale> sbt about
[info] Loading settings from idea.sbt ...
[info] Loading global plugins from /Users/kale/.sbt/1.0/plugins
[info] Loading settings from plugins.sbt ...
[info] Loading project definition from 
/Users/kale/workspace/gr8Project/myapp/project
[info] Loading settings from build.sbt ...
[info] Set current project to myapp (in build 
file:/Users/kale/workspace/gr8Project/myapp/)
[info] This is sbt 1.0.3
[info] The current project is 
{file:/Users/kale/workspace/gr8Project/myapp/}myapp 0.1-SNAPSHOT
[info] The current project is built against Scala 2.12.8
[info] Available Plugins: sbt.plugins.IvyPlugin, 
sbt.plugins.JvmPlugin, sbt.plugins.CorePlugin, 
sbt.plugins.JUnitXmlReportPlugin, 
sbt.plugins.Giter8TemplatePlugin, sbtassembly.AssemblyPlugin, 
com.lucidchart.sbt.scalafmt.ScalafmtCorePlugin, 
com.lucidchart.sbt.scalafmt.ScalafmtPlugin, 
com.lucidchart.sbt.scalafmt.ScalafmtSbtPlugin, 
scoverage.ScoverageSbtPlugin, 
net.virtualvoid.sbt.graph.DependencyGraphPlugin, 
sbtdocker.DockerPlugin, Build, Docker
[info] sbt, sbt plugins, and build definitions are using Scala 
2.12.4

如何将sbt版本更改为1.2.8？