diff --git a/project.clj b/project.clj
index 06ea177..9bc5e35 100644
--- a/project.clj
+++ b/project.clj
@@ -1,4 +1,4 @@
-(defproject techascent/tech.datatype "4.57"
+(defproject techascent/tech.datatype "4.58-SNAPSHOT"
   :description "Library for efficient manipulation of contiguous mutable containers of primitive datatypes."
   :url "http://github.com/tech-ascent/tech.datatype"
   :license {:name "Eclipse Public License"