diff --git a/CHANGELOG.md b/CHANGELOG.md
index 04774f2..990c4f4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [1.0.0] - 2024-06-14
+
 - Initial release
 
-[unreleased]: https://gitlab.com/soapbox-pub/ditto/-/compare/main...HEAD
+[unreleased]: https://gitlab.com/soapbox-pub/ditto/-/compare/v1.0.0...HEAD
+[1.0.0]: https://gitlab.com/soapbox-pub/ditto/-/tags/v1.0.0
diff --git a/src/controllers/api/instance.ts b/src/controllers/api/instance.ts
index 4c3e981..bda055d 100644
--- a/src/controllers/api/instance.ts
+++ b/src/controllers/api/instance.ts
@@ -3,7 +3,7 @@ import { Conf } from '@/config.ts';
 import { Storages } from '@/storages.ts';
 import { getInstanceMetadata } from '@/utils/instance.ts';
 
-const version = '0.0.0 (compatible; Ditto 0.0.1)';
+const version = '3.0.0 (compatible; Ditto 1.0.0)';
 
 const instanceV1Controller: AppController = async (c) => {
   const { host, protocol } = Conf.url;