```clojure
(defproject scrabble "0.1.0-SNAPSHOT"
  :dependencies [[org.clojure/clojure "1.6.0"]
                 [thinktopic/cortex "0.1.0-SNAPSHOT"]]
  :main scrabble.core)
```

Update to newer version of clojure.
user
```clojure
(defproject scrabble "0.1.0-SNAPSHOT"
  :dependencies [[org.clojure/clojure "1.8.0"]
                 [thinktopic/cortex "0.1.0-SNAPSHOT"]]
  :main scrabble.core)
```
assistant