diff --git a/CHANGELOG.md b/CHANGELOG.md
index d251f9879..35ad9caea 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,12 @@ All notable changes to this project will be documented in this file.
 **The 4.0.x branch will not receive any update after 2023-10-31.**
 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.
 
+## [4.0.11] - 2023-09-20
+
+### Fixed
+
+- Fix post translation erroring out ([ClearlyClaire](https://github.com/mastodon/mastodon/pull/26990))
+
 ## [4.0.10] - 2023-09-19
 
 ### Fixed
diff --git a/app/lib/translation_service/deepl.rb b/app/lib/translation_service/deepl.rb
index 537fd24c0..2b4746a4d 100644
--- a/app/lib/translation_service/deepl.rb
+++ b/app/lib/translation_service/deepl.rb
@@ -46,7 +46,7 @@ class TranslationService::DeepL < TranslationService
 
     raise UnexpectedResponseError unless json.is_a?(Hash)
 
-    Translation.new(text: json.dig('translations', 0, 'text'), detected_source_language: json.dig('translations', 0, 'detected_source_language')&.downcase, provider: 'DeepL.com')
+    Translation.new(text: Sanitize.fragment(json.dig('translations', 0, 'text'), Sanitize::Config::MASTODON_STRICT), detected_source_language: json.dig('translations', 0, 'detected_source_language')&.downcase, provider: 'DeepL.com')
   rescue Oj::ParseError
     raise UnexpectedResponseError
   end
diff --git a/app/lib/translation_service/libre_translate.rb b/app/lib/translation_service/libre_translate.rb
index 43576e306..ee668d298 100644
--- a/app/lib/translation_service/libre_translate.rb
+++ b/app/lib/translation_service/libre_translate.rb
@@ -37,7 +37,7 @@ class TranslationService::LibreTranslate < TranslationService
 
     raise UnexpectedResponseError unless json.is_a?(Hash)
 
-    Translation.new(text: json['translatedText'], detected_source_language: source_language, provider: 'LibreTranslate')
+    Translation.new(text: Sanitize.fragment(json['translatedText'], Sanitize::Config::MASTODON_STRICT), detected_source_language: source_language, provider: 'LibreTranslate')
   rescue Oj::ParseError
     raise UnexpectedResponseError
   end
diff --git a/app/services/translate_status_service.rb b/app/services/translate_status_service.rb
index b905f8158..6e6ed87b0 100644
--- a/app/services/translate_status_service.rb
+++ b/app/services/translate_status_service.rb
@@ -12,8 +12,8 @@ class TranslateStatusService < BaseService
     @content = status_content_format(@status)
     @target_language = target_language
 
-    Rails.cache.fetch("translations/#{@status.language}/#{@target_language}/#{content_hash}", expires_in: CACHE_TTL) do
-      Sanitize.fragment(translation_backend.translate(@content, @status.language, @target_language), Sanitize::Config::MASTODON_STRICT)
+    Rails.cache.fetch("translations:v2/#{@status.language}/#{@target_language}/#{content_hash}", expires_in: CACHE_TTL) do
+      translation_backend.translate(@content, @status.language, @target_language)
     end
   end
 
diff --git a/docker-compose.yml b/docker-compose.yml
index c59d0b525..dbe314a12 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -56,7 +56,7 @@ services:
 
   web:
     build: .
-    image: ghcr.io/mastodon/mastodon:v4.0.10
+    image: ghcr.io/mastodon/mastodon:v4.0.11
     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:v4.0.10
+    image: ghcr.io/mastodon/mastodon:v4.0.11
     restart: always
     env_file: .env.production
     command: node ./streaming
@@ -95,7 +95,7 @@ services:
 
   sidekiq:
     build: .
-    image: ghcr.io/mastodon/mastodon:v4.0.10
+    image: ghcr.io/mastodon/mastodon:v4.0.11
     restart: always
     env_file: .env.production
     command: bundle exec sidekiq
diff --git a/lib/mastodon/version.rb b/lib/mastodon/version.rb
index 1465e4372..1185e1d72 100644
--- a/lib/mastodon/version.rb
+++ b/lib/mastodon/version.rb
@@ -13,7 +13,7 @@ module Mastodon
     end
 
     def patch
-      10
+      11
     end
 
     def flags