diff --git a/package.json b/package.json
index cbf4835..a432530 100644
--- a/package.json
+++ b/package.json
@@ -57,7 +57,7 @@
     "niceName": "Connector for Mobilizon",
     "phpMinimumVersion": 7.4,
     "wordpressMinimumVersion": 5.6,
-    "wordpressTestedUpToVersion": 5.8
+    "wordpressTestedUpToVersion": 5.9
   },
   "lint-staged": {
     "source/**/*.js": "eslint",
diff --git a/source/changelog.txt b/source/changelog.txt
index ff2a46f..6ad3522 100644
--- a/source/changelog.txt
+++ b/source/changelog.txt
@@ -1,6 +1,7 @@
 ### [Unreleased]
 #### Added
 #### Changed
+- Confirm compatibility with WordPress 5.9
 #### Deprecated
 #### Removed
 #### Fixed