diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 5e75168..3dcec17 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -38,7 +38,7 @@ jobs:
       fail-fast: false
       max-parallel: 10
       matrix:
-        php: ['7.2', '7.3', '7.4', '8.0', '8.1', '8.2', '8.3', '8.4', '8.5']
+        php: ['7.2', '7.3', '7.4', '8.0', '8.1', '8.2', '8.3', '8.4', '8.5', '8.6']
 
     steps:
       - name: Set up PHP
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0977430..30e24d8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # CHANGELOG
 
+## 1.5.4 - UPCOMING
+
+* Add support for PHP 8.6
+
 ## 1.5.3 - 2026-07-17
 
 * Require `guzzlehttp/guzzle` ^7.15 and `guzzlehttp/psr7` ^2.13