diff --git a/_extensions/posit-docs/_extension.yml b/_extensions/posit-docs/_extension.yml
index 3b7ae4a..7e73a8d 100644
--- a/_extensions/posit-docs/_extension.yml
+++ b/_extensions/posit-docs/_extension.yml
@@ -1,6 +1,6 @@
 title: posit-docs
 author: Ashley Henry, David Aja, Aron Atkins
-version: 3.1.0
+version: 4.0.0
 quarto-required: ">=1.3.340"
 contributes:
   project:
diff --git a/changelog.md b/changelog.md
index bf13d92..1e9d5ab 100644
--- a/changelog.md
+++ b/changelog.md
@@ -1,4 +1,4 @@
-# unreleased
+# v.4.0.0
 
 * Add Posit dark mode theme
 * Resolves Callout colors issue (#57)