Problems setting up Android Studio - cannot run project in emulator

Outdated Kotlin Runtime
Your version of Kotlin runtime in ‘Gradle: org.jetbrains.kotlin:kotlin-stdlib:1.2.30@jar’ library is 1.2.30-release-78 (1.2.30), while plugin version is 1.2.31-release-Studio3.1-1.
Runtime library should be updated to avoid compatibility problems.

When I try to update it says I have to do it manually. … any help appreciated