diff --git a/composer.json b/composer.json
index a2a0aad0de821074f5982f5e04f983268e1d82b3..cadb3d24a48e6ddfd0314fcab96f04d9f3ea4438 100644
--- a/composer.json
+++ b/composer.json
@@ -81,7 +81,7 @@
         "npm-asset/prototype-js-core": "1.7.3",
         "noblogs/r2db": "0.1.7",
         "noblogs/ai-global-activity-plugin": "0.0.20",
-        "noblogs/ai-mu-plugins": "0.3.4",
+        "noblogs/ai-mu-plugins": "0.4.2",
         "noblogs/noblogs-wp-ssl": "0.1.0",
         "noblogs/remove-gravatar": "0.1.1",
         "noblogs/themes-child": "0.5.2",
@@ -122,7 +122,8 @@
         "wpackagist-theme/ff-multipurpose": "1.2.0",
         "wpackagist-plugin/two-factor-provider-webauthn": "1.0.3",
         "wpackagist-plugin/event-organiser": "3.12.0",
-        "noblogs/ai-authenticate-rest-api-plugin": "0.0.1"
+        "noblogs/ai-authenticate-rest-api-plugin": "0.0.1",
+        "wpackagist-plugin/multisite-custom-css": "^1.0"
     },    
     "extra": {
         "wordpress-install-dir": "app",
diff --git a/composer.lock b/composer.lock
index 17e659ae79627f51591c07e8d0dfd12a221d3cb2..8b6f1aea8c5b8fcf2adf39db625c76a2804ccbf8 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": "1fe35de53a193e0c30de29625718e724",
+    "content-hash": "e1a154d4f387ceb6c0615faf5aa84476",
     "packages": [
         {
             "name": "bjornjohansen/wplang",
@@ -498,16 +498,16 @@
         },
         {
             "name": "noblogs/ai-mu-plugins",
-            "version": "0.3.4",
+            "version": "0.4.2",
             "source": {
                 "type": "git",
                 "url": "https://git.autistici.org/noblogs/ai-mu-plugins.git",
-                "reference": "c4dc6afc6942d4e1df2e9ce7c9f44bc96ea69ee1"
+                "reference": "ffcd137d92be698d33e13bafb73ecacce7e634ed"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://git.autistici.org/api/v4/projects/452/packages/composer/archives/noblogs/ai-mu-plugins.zip?sha=c4dc6afc6942d4e1df2e9ce7c9f44bc96ea69ee1",
-                "reference": "c4dc6afc6942d4e1df2e9ce7c9f44bc96ea69ee1",
+                "url": "https://git.autistici.org/api/v4/projects/452/packages/composer/archives/noblogs/ai-mu-plugins.zip?sha=ffcd137d92be698d33e13bafb73ecacce7e634ed",
+                "reference": "ffcd137d92be698d33e13bafb73ecacce7e634ed",
                 "shasum": ""
             },
             "require": {
@@ -1149,6 +1149,24 @@
             "type": "wordpress-plugin",
             "homepage": "https://wordpress.org/plugins/more-privacy-options/"
         },
+        {
+            "name": "wpackagist-plugin/multisite-custom-css",
+            "version": "1.0",
+            "source": {
+                "type": "svn",
+                "url": "https://plugins.svn.wordpress.org/multisite-custom-css/",
+                "reference": "trunk"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://downloads.wordpress.org/plugin/multisite-custom-css.zip?timestamp=1614471423"
+            },
+            "require": {
+                "composer/installers": "^1.0 || ^2.0"
+            },
+            "type": "wordpress-plugin",
+            "homepage": "https://wordpress.org/plugins/multisite-custom-css/"
+        },
         {
             "name": "wpackagist-plugin/nofollow-free",
             "version": "1.6.3",
@@ -2168,5 +2186,5 @@
         "php": ">=7.1"
     },
     "platform-dev": [],
-    "plugin-api-version": "2.3.0"
+    "plugin-api-version": "2.0.0"
 }