diff --git a/composer.json b/composer.json
index 43b9e94fcdf5648087f8ce6c1c141390e671fee6..9733e3f6e01952d70195923e025bfe5cbcb5eae7 100644
--- a/composer.json
+++ b/composer.json
@@ -113,7 +113,7 @@
         "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": "5.5.0",
+        "wpackagist-plugin/activitypub": "5.6.1",
         "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 f720282888a80bc27ad74b5e04a530b233043431..c6a25a87e3cb8166a7b768c50df14e292683a2e2 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": "618594b8d5fcaddc854d17acf1180ed0",
+    "content-hash": "0f9ec22bbf6adbf228192f37b813074f",
     "packages": [
         {
             "name": "composer/installers",
@@ -918,15 +918,15 @@
         },
         {
             "name": "wpackagist-plugin/activitypub",
-            "version": "5.5.0",
+            "version": "5.6.1",
             "source": {
                 "type": "svn",
                 "url": "https://plugins.svn.wordpress.org/activitypub/",
-                "reference": "tags/5.5.0"
+                "reference": "tags/5.6.1"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://downloads.wordpress.org/plugin/activitypub.5.5.0.zip"
+                "url": "https://downloads.wordpress.org/plugin/activitypub.5.6.1.zip"
             },
             "require": {
                 "composer/installers": "^1.0 || ^2.0"