diff --git a/CHANGELOG.md b/CHANGELOG.md
index 622bcf84..05ae4f3c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,4 @@
-Unreleased Changes
+4.0.0 (2024-07-18)
 ------------------
 
 * Feature - Add support for Action Mailbox with SES (#127).
diff --git a/VERSION b/VERSION
index 4eba2a62..fcdb2e10 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-3.13.0
+4.0.0