diff --git a/CHANGELOG.md b/CHANGELOG.md
index f5a24fc..3b9b99f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,6 @@
 # CHANGELOG.md
 
-## UNRELEASED
+## 4.0.0
 
 ### Breaking
 
diff --git a/project.clj b/project.clj
index 739be68..e927efd 100644
--- a/project.clj
+++ b/project.clj
@@ -1,4 +1,4 @@
-(defproject town.lilac/pyramid "3.4.0"
+(defproject town.lilac/pyramid "4.0.0"
   :description "A library for storing and querying graph data in a Clojure map"
   :url "https://github.com/lilactown/pyramid"
   :scm {:name "git" :url "https://github.com/lilactown/pyramid"}