Lacinia targets Clojure 1.9, and makes specific use of clojure.spec.
To use Lacinia with Clojure 1.8, modify your :file:`project.clj` to include clojure-future-spec:
:dependencies [[org.clojure/clojure "1.8.0"]
[com.walmartlabs/lacinia "x.y.z"]
[clojure-future-spec ""]
...]