In grails 2.x version, the bouncy castle provided by the grails itself is present in the runtime environment In grails 2.x version, the bouncy castle provided by the grails itself is present in the runtime environment. Since the bc library in part of grail lib, is it possible to overwrite with latest bc library. Even though I defined the dependency as below, still it is using the old version present in grails lib directory. dependencies { runtime 'org.bouncycastlebcprov jdk18on1.80' runtime 'org.bouncycastlebcpkix jdk18on1.80' }