diff --git a/CHANGELOG.md b/CHANGELOG.md
index 56b6fbc92c..bf5dbd2ba9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,23 @@
 
 All notable changes to this project will be documented in this file.
 
+## [4.5.9] - 2026-04-15
+
+### Security
+
+- Insufficient verification of email addresses ([GHSA-5r37-qpwq-2jhh](https://github.com/mastodon/mastodon/security/advisories/GHSA-5r37-qpwq-2jhh))
+- Updated dependencies
+
+### Added
+
+- Add trademark warning to `mastodon:setup` task (#38548 by @ClearlyClaire)
+
+### Fixed
+
+- Fix definition for `quote` in JSON-LD context (#38686 by @ClearlyClaire)
+- Fix being unable to disable sound for quote update notification (#38537 by @ClearlyClaire)
+- Fix being able to quote someone you blocked (#38608 by @ClearlyClaire)
+
 ## [4.5.8] - 2026-03-24
 
 ### Security
diff --git a/docker-compose.yml b/docker-compose.yml
index 59d0cc12d1..2200b9851b 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -59,7 +59,7 @@ services:
   web:
     # You can uncomment the following line if you want to not use the prebuilt image, for example if you have local code changes
     # build: .
-    image: ghcr.io/mastodon/mastodon:v4.5.8
+    image: ghcr.io/mastodon/mastodon:v4.5.9
     restart: always
     env_file: .env.production
     command: bundle exec puma -C config/puma.rb
@@ -83,7 +83,7 @@ services:
     # build:
     #   dockerfile: ./streaming/Dockerfile
     #   context: .
-    image: ghcr.io/mastodon/mastodon-streaming:v4.5.8
+    image: ghcr.io/mastodon/mastodon-streaming:v4.5.9
     restart: always
     env_file: .env.production
     command: node ./streaming/index.js
@@ -102,7 +102,7 @@ services:
   sidekiq:
     # You can uncomment the following line if you want to not use the prebuilt image, for example if you have local code changes
     # build: .
-    image: ghcr.io/mastodon/mastodon:v4.5.8
+    image: ghcr.io/mastodon/mastodon:v4.5.9
     restart: always
     env_file: .env.production
     command: bundle exec sidekiq
diff --git a/lib/mastodon/version.rb b/lib/mastodon/version.rb
index 1141fdaeef..8801ca59be 100644
--- a/lib/mastodon/version.rb
+++ b/lib/mastodon/version.rb
@@ -17,7 +17,7 @@ module Mastodon
     end
 
     def default_prerelease
-      'alpha.6'
+      'alpha.7'
     end
 
     def prerelease