(defproject clj-tutorials "0.1.0-SNAPSHOT"
  :description "FIXME: write description"
  :url "http://example.com/FIXME"
  :license {:name "Eclipse Public License"
            :url "http://www.eclipse.org/legal/epl-v10.html"}
  :dependencies [[org.clojure/clojure "1.6.0"]
                 [org.clojure/core.async "0.1.346.0-17112a-alpha"]
                 [http-kit "2.1.19"]
                 [ring/ring-core "1.3.1"]
                 [javax.servlet/servlet-api "2.5"]
                 [compojure "1.2.1"]
                 [clj-gatling "0.3.0"]])

(defproject clj-tutorials "0.1.0-SNAPSHOT"
  :description "FIXME: write description"
  :url "http://example.com/FIXME"
  :license {:name "Eclipse Public License"
            :url "http://www.eclipse.org/legal/epl-v10.html"}
  :dependencies [[org.clojure/clojure "1.6.0"]
                 [org.clojure/core.async "0.1.346.0-17112a-alpha"]
                 [http-kit "2.1.16"]
                 [ring/ring-core "1.3.1"]
                 [javax.servlet/servlet-api "2.5"]
                 [compojure "1.2.1"]
                 [clj-gatling "0.3.0"]])

Use correct version of http-kit
Use correct version of http-kit

mhjort/clj-tutorials