diff --git a/CHANGELOG.md b/CHANGELOG.md
index f858c27..04c2e9a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
+## [Unreleased]
+
+### Fixed
+
+- CI: fix Psalm cache directory, declare a unique composer autoloader suffix
+
 ## [2.14.8] - 2026-09-30
 
 ### Fixed
diff --git a/composer.json b/composer.json
index a308b53..f1e2ad1 100644
--- a/composer.json
+++ b/composer.json
@@ -3,6 +3,7 @@
         "php": ">=8.2"
     },
     "config": {
+        "autoloader-suffix": "PluginTag",
         "optimize-autoloader": true,
         "platform": {
             "php": "8.2.99"
diff --git a/psalm.xml b/psalm.xml
index 0f4848a..bbc882f 100644
--- a/psalm.xml
+++ b/psalm.xml
@@ -1,6 +1,7 @@
 <?xml version="1.0"?>
 <psalm
     runTaintAnalysis="true"
+    cacheDirectory="var/psalm"
 >
     <projectFiles>
         <directory name="ajax" />