I have this in my building.gradle
buildscript {
    ext.kotlin_version = '1.1.2-4'
    ext.kotlin_version = '1.1.2'
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:2.3.3'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
}
and always show me this
Outdated Kotlin Runtime
        Your version of Kotlin runtime in 'kotlin-stdlib-1.1.2' library is 1.1.2, while plugin version is 1.1.2-release-Studio2.3-5.
        Runtime library should be updated to avoid compatibility problems.

Update the Kotlin version to 1.1.2-5:
buildscript {
    ext.kotlin_version = '1.1.2-5'
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:2.3.3'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
}
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