diff --git a/.github/workflows/continuous-integration-32-bits.yml b/.github/workflows/continuous-integration-32-bits.yml
index 4c7d5815..2ae309a2 100644
--- a/.github/workflows/continuous-integration-32-bits.yml
+++ b/.github/workflows/continuous-integration-32-bits.yml
@@ -4,9 +4,11 @@ on:
   push:
     branches:
       - main
+      - 5.x.x
   pull_request:
     branches:
       - main
+      - 5.x.x
 
 env:
   COMPOSER_FLAGS: "--ansi --no-interaction --no-progress --prefer-dist"
diff --git a/.github/workflows/continuous-integration.yml b/.github/workflows/continuous-integration.yml
index f5632b4d..ee0fc948 100644
--- a/.github/workflows/continuous-integration.yml
+++ b/.github/workflows/continuous-integration.yml
@@ -4,9 +4,11 @@ on:
   push:
     branches:
       - main
+      - 5.x.x
   pull_request:
     branches:
       - main
+      - 5.x.x
 
 env:
   COMPOSER_FLAGS: "--ansi --no-interaction --no-progress --prefer-dist"
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index 34a45e95..90784e04 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -7,6 +7,7 @@ on:
   pull_request:
     branches:
       - main
+      - 5.x.x
 
 jobs:
   lint:
diff --git a/.github/workflows/style-check.yml b/.github/workflows/style-check.yml
index 0b0b88e3..d31164a2 100644
--- a/.github/workflows/style-check.yml
+++ b/.github/workflows/style-check.yml
@@ -4,9 +4,11 @@ on:
   push:
     branches:
       - main
+      - 5.x.x
   pull_request:
     branches:
       - main
+      - 5.x.x
 
 jobs:
   style-check:
diff --git a/CHANGELOG.md b/CHANGELOG.md
index d9fca36e..0fbbb5ea 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Changed
+- ci: Run workflows against 5.x.x branches ([#859](https://github.com/jsonrainbow/json-schema/pull/859))
 
 ## [6.6.3] - 2025-12-02
 ### Changed