remembered to test now:

0% cat project.clj
(defproject lol "0.1.0-SNAPSHOT"
  :dependencies [[org.clojure/clojure "1.8.0"]
                 [hcadatalab/powderkeg "0.5.1"]])
0% lein update-in :dependencies conj "[org.apache.spark/spark-core_2.11 \"2.1.0\"] [org.apache.spark/spark-streaming_2.11 \"2.1.0\"]" -- deps :tree 2> /dev/null | grep kryo
     [com.esotericsoftware.kryo/kryo "2.21"]
     [com.esotericsoftware/kryo-shaded "3.0.3"]
0% lein update-in :dependencies conj "[org.apache.spark/spark-core_2.11 \"1.5.2\"] [org.apache.spark/spark-streaming_2.11 \"1.5.2\"]" -- deps :tree 2> /dev/null | grep kryo
     [com.esotericsoftware.kryo/kryo "2.21"]