'Why do I have different versions of Kotlin JARs in the classpath?

I decided to add a couple Kotlin files to an existing Java Android project in AS 3.0.

Once I added Kotlin files, I let the assistant add the appropriate lines to my build.gradle files, in particular:

project build.gradle

buildscript {
    ext.kotlin_version = '1.2.21'
    //...
    dependencies {
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"

app build.gradle

// top of file
apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
//....
dependencies {
    compile "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"

Unfortunately all builds now produce this warning:

Warning:Runtime JAR files in the classpath should have the same version. These files were found in the classpath:
/Users/sddsfsd/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib-jdk7/1.2.21/88bfff5aa470143a83b0bc5ec00c0be8cabd7cad/kotlin-stdlib-jdk7-1.2.21.jar (version 1.2)
/Applications/Android Studio.app/Contents/gradle/m2repository/org/jetbrains/kotlin/kotlin-stdlib-jre7/1.1.51/kotlin-stdlib-jre7-1.1.51.jar (version 1.1)
/Users/sddsfsd/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib/1.2.21/d64187eb2d9d1521be3421aa8c6774a8625cdde8/kotlin-stdlib-1.2.21.jar (version 1.2)

Why does Android Studio have its own older version of Kotlin in the classpath? How do I remove it?

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'Why do I have different versions of Kotlin JARs in the classpath?

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