How can I solve the ```Warning:kotlin: Runtime JAR...

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[Lawik]

How can I solve the

Warning:kotlin: Runtime JAR files in the classpath should have the same version. These files were found in the classpath:
    .../.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib-jdk7/1.2.31/95d6a67e8787280a82a2059e54e4db7ac6cfe74/kotlin-stdlib-jdk7-1.2.31.jar (version 1.2)
    .../.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib-jdk8/1.2.31/50094b02ec8a4c2e4444073c722bb56c8a52b83c/kotlin-stdlib-jdk8-1.2.31.jar (version 1.2)
    .../.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-reflect/1.3.10/dd02865be0351707554b16a896b766b2396cdafa/kotlin-reflect-1.3.10.jar (version 1.3)
    .../.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib/1.3.30/9ea98e65c246d34de9af59c104ad9bdea4908ee/kotlin-stdlib-1.3.30.jar (version 1.3)
    .../.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib-common/1.3.30/989a125fdb6e4d0d75a016032e03e1e3b57a13d/kotlin-stdlib-common-1.3.30.jar (version 1.3)h

warning? The 1.2 stdlib dependencies seem to come from a library I have added as a dependency to my project?

EDIT: Nevermind, I had to add kotlin-stdlib-jdk7:1.3.21 and kotlin-stdlib-jdk8:1.3.21 dependencies explicitly to fix it.