Does OkHttp 4.0.0 require JVM target 1.8?

Found a blog post with some explanations. Since OkHttp 3.13.1 JVM target 1.8 is required. The suggested change is:

android {
  compileOptions {
    sourceCompatibility JavaVersion.VERSION_1_8
    targetCompatibility JavaVersion.VERSION_1_8
  }
  ...
}

I found that it still fails. Adding one more instruction finally fixes the build.

kotlinOptions {
    jvmTarget = '1.8'
}