diff --git a/CHANGELOG.md b/CHANGELOG.md
index 15a61af..246aa46 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,3 +6,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+
+## [1.0.0] - 2026-03-20
+
+First release with changelog.
diff --git a/Cargo.toml b/Cargo.toml
index 8ece549..1e4af73 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "clocksource"
-version = "1.0.0-alpha.0"
+version = "1.0.0"
 authors = ["Brian Martin <brian@iop.systems>"]
 edition = "2024"
 description = "Library for times and durations with fixed-size representations"