diff --git a/CHANGELOG.md b/CHANGELOG.md
index bb0d7a244a..9e17ea8d61 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,7 +6,21 @@ All notable changes to this project will be documented in this file.
 ## End of life notice
 
 **The 3.5.x branch will not receive any update after 2023-12-31.**
-This means that no security fix will be made available for this branch after this date, and you will need to update to a more recent version (such as the 4.1.x branch) to receive security fixes.
+This means that no security fix will be made available for this branch after this date, and you will need to update to a more recent version (such as the 4.2.x branch) to receive security fixes.
+
+## [3.5.15] - 2023-10-10
+
+### Changed
+
+- Change user archive export allowed period from 7 days to 6 days ([suddjian](https://github.com/mastodon/mastodon/pull/27200))
+
+### Fixed
+
+- Fix mentions being matched in some URL query strings ([mjankowski](https://github.com/mastodon/mastodon/pull/25656))
+- Fix importer returning negative row estimates ([jgillich](https://github.com/mastodon/mastodon/pull/27258))
+- Fix filtering audit log for entries about disabling 2FA ([ClearlyClaire](https://github.com/mastodon/mastodon/pull/27186))
+- Fix tIME chunk not being properly removed from PNG uploads ([TheEssem](https://github.com/mastodon/mastodon/pull/27111))
+- Fix inefficient queries in “Follows and followers” as well as several admin pages ([ClearlyClaire](https://github.com/mastodon/mastodon/pull/27116), [ClearlyClaire](https://github.com/mastodon/mastodon/pull/27306))
 
 ## [3.5.14] - 2023-09-19
 
diff --git a/docker-compose.yml b/docker-compose.yml
index 4001b1e7fc..a6840f40da 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -44,7 +44,7 @@ services:
 
   web:
     build: .
-    image: ghcr.io/mastodon/mastodon:v3.5.14
+    image: ghcr.io/mastodon/mastodon:v3.5.15
     restart: always
     env_file: .env.production
     command: bash -c "rm -f /mastodon/tmp/pids/server.pid; bundle exec rails s -p 3000"
@@ -65,7 +65,7 @@ services:
 
   streaming:
     build: .
-    image: ghcr.io/mastodon/mastodon:v3.5.14
+    image: ghcr.io/mastodon/mastodon:v3.5.15
     restart: always
     env_file: .env.production
     command: node ./streaming
@@ -83,7 +83,7 @@ services:
 
   sidekiq:
     build: .
-    image: ghcr.io/mastodon/mastodon:v3.5.14
+    image: ghcr.io/mastodon/mastodon:v3.5.15
     restart: always
     env_file: .env.production
     command: bundle exec sidekiq
diff --git a/lib/mastodon/version.rb b/lib/mastodon/version.rb
index 0dcef7f6b3..30e7cac69a 100644
--- a/lib/mastodon/version.rb
+++ b/lib/mastodon/version.rb
@@ -13,7 +13,7 @@ module Mastodon
     end
 
     def patch
-      14
+      15
     end
 
     def flags