diff --git a/composer.json b/composer.json
index 8cf5be95fbc7956f6da2a228ee922f5260beeedb..3f2fea4267503a8ac7469c513a3d434344b40ec7 100644
--- a/composer.json
+++ b/composer.json
@@ -114,7 +114,7 @@
         "wpackagist-plugin/event-organiser": "3.12.8",
         "noblogs/ai-authenticate-rest-api-plugin": "0.0.4",
         "wpackagist-plugin/multisite-custom-css": "1.0",
-        "wpackagist-plugin/activitypub": "5.2.0",
+        "wpackagist-plugin/activitypub": "5.3.0",
         "wpackagist-plugin/gallery-block-lightbox": "1.15",
         "wpackagist-plugin/unconfirmed": "1.3.7",
         "noblogs/wp-mat": "0.1.4",
diff --git a/composer.lock b/composer.lock
index dd5aa700820f17f774294d7dbe40ab2997e17344..dd3834f1f23bee2f7a76987b8f9cfcba12d0c6f3 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "2741a98273e85557561edfcfd9b5c94d",
+    "content-hash": "ca8800de7cc397ce9a9ef52c47d075c9",
     "packages": [
         {
             "name": "composer/installers",
@@ -918,15 +918,15 @@
         },
         {
             "name": "wpackagist-plugin/activitypub",
-            "version": "5.2.0",
+            "version": "5.3.0",
             "source": {
                 "type": "svn",
                 "url": "https://plugins.svn.wordpress.org/activitypub/",
-                "reference": "tags/5.2.0"
+                "reference": "tags/5.3.0"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://downloads.wordpress.org/plugin/activitypub.5.2.0.zip"
+                "url": "https://downloads.wordpress.org/plugin/activitypub.5.3.0.zip"
             },
             "require": {
                 "composer/installers": "^1.0 || ^2.0"
@@ -2162,12 +2162,12 @@
     "packages-dev": [],
     "aliases": [],
     "minimum-stability": "stable",
-    "stability-flags": [],
+    "stability-flags": {},
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": {
         "php": ">=7.1"
     },
-    "platform-dev": [],
+    "platform-dev": {},
     "plugin-api-version": "2.6.0"
 }