diff --git a/CHANGELOG.md b/CHANGELOG.md
index b2229f9fdcb..f3e364320bd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,27 @@
 
 All notable changes to this project will be documented in this file.
 
+## [4.2.13] - 2024-09-30
+
+### Security
+
+- Fix ReDoS vulnerability on some Ruby versions ([GHSA-jpxp-r43f-rhvx](https://github.com/mastodon/mastodon/security/advisories/GHSA-jpxp-r43f-rhvx))
+- Update dependencies
+
+### Added
+
+- Add “A Mastodon update is available.” message on admin dashboard for non-bugfix updates (#32106 by @ClearlyClaire)
+
+### Changed
+
+- Change Mastodon to issue correct HTTP signatures by default (#31994 by @ClearlyClaire)
+
+### Fixed
+
+- Fix replies collection being cached improperly
+- Fix security context sometimes not being added in LD-Signed activities (#31871 by @ClearlyClaire)
+- Fix error when encountering reblog of deleted post in feed rebuild (#32001 by @ClearlyClaire)
+
 ## [4.2.12] - 2024-08-19
 
 ### Fixed
diff --git a/docker-compose.yml b/docker-compose.yml
index d4d5e89febf..2645c9eebe9 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -56,7 +56,7 @@ services:
 
   web:
     build: .
-    image: ghcr.io/mastodon/mastodon:v4.2.12
+    image: ghcr.io/mastodon/mastodon:v4.2.13
     restart: always
     env_file: .env.production
     command: bash -c "rm -f /mastodon/tmp/pids/server.pid; bundle exec rails s -p 3000"
@@ -77,7 +77,7 @@ services:
 
   streaming:
     build: .
-    image: ghcr.io/mastodon/mastodon:v4.2.12
+    image: ghcr.io/mastodon/mastodon:v4.2.13
     restart: always
     env_file: .env.production
     command: node ./streaming
@@ -95,7 +95,7 @@ services:
 
   sidekiq:
     build: .
-    image: ghcr.io/mastodon/mastodon:v4.2.12
+    image: ghcr.io/mastodon/mastodon:v4.2.13
     restart: always
     env_file: .env.production
     command: bundle exec sidekiq
diff --git a/lib/mastodon/version.rb b/lib/mastodon/version.rb
index f0e0554c3f2..da6bca7b3ea 100644
--- a/lib/mastodon/version.rb
+++ b/lib/mastodon/version.rb
@@ -13,7 +13,7 @@ module Mastodon
     end
 
     def patch
-      12
+      13
     end
 
     def default_prerelease