BC jdk15on 1.62 incompatible with JDK 8

I got this in a build earlier today where its reporting a class in the
bcpkix-jdk15on jar having been built with JDK 9.

 [proguard] java.io.IOException: Can't read
[/home/mondain/.m2/repo/org/bouncycastle/bcpkix-jdk15on/1.62/bcpkix-jdk15on-1.62.jar]
(Can't process class [META-INF/versions/9/module-info.class] (Unsupported
class version number [53.0] (maximum 52.0, Java 1.8)))

Is there somewhere that I should post an issue report? or could I be
mistaken here?

Regards,
Paul
-- 
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