diff --git a/CHANGELOG.md b/CHANGELOG.md
index fcd11cf2e..c7737d28c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,4 @@
-# 0.4.0 (Unreleased)
+# 0.4.0 (September 24, 2021)
 
 BREAKING CHANGES:
 * The `AttributeType` property of `tftypes.Map` has been renamed to `ElementType`. ([#105](https://github.com/hashicorp/terraform-plugin-go/issues/105))