diff --git a/project.clj b/project.clj
index 2760f64..ea5d75b 100644
--- a/project.clj
+++ b/project.clj
@@ -12,7 +12,7 @@
 ;; and limitations under the License.
 
 (defproject com.climate/claypoole
-  "0.3.3-SNAPSHOT"
+  "0.4.0"
   :description "Claypoole: Threadpool tools for Clojure."
   :url "http://github.com/TheClimateCorporation/claypoole/"
   :license {:name "Apache License Version 2.0"