diff --git a/composer.json b/composer.json
index 446c71afbec78c36e0f651516e3f3018643bcf92..b35eccd4f9035b4aed42eec38dcaecdae4953437 100644
--- a/composer.json
+++ b/composer.json
@@ -112,7 +112,7 @@
         "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": "4.7.3",
+        "wpackagist-plugin/activitypub": "5.0.0",
         "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 4cac5e533a62169284a4c02f619f8f947cdcdd1b..596719406021d9990ec3542606e309d197bf9949 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": "8060314d5ff8de26b4195beef3259ad2",
+    "content-hash": "1a1d124b456e466873d656dca268cc8f",
     "packages": [
         {
             "name": "composer/installers",
@@ -892,15 +892,15 @@
         },
         {
             "name": "wpackagist-plugin/activitypub",
-            "version": "4.7.3",
+            "version": "5.0.0",
             "source": {
                 "type": "svn",
                 "url": "https://plugins.svn.wordpress.org/activitypub/",
-                "reference": "tags/4.7.3"
+                "reference": "tags/5.0.0"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://downloads.wordpress.org/plugin/activitypub.4.7.3.zip"
+                "url": "https://downloads.wordpress.org/plugin/activitypub.5.0.0.zip"
             },
             "require": {
                 "composer/installers": "^1.0 || ^2.0"