diff --git a/machines/nextcloud/configuration.nix b/machines/nextcloud/configuration.nix
index ad68296..0c9210f 100644
--- a/machines/nextcloud/configuration.nix
+++ b/machines/nextcloud/configuration.nix
@@ -33,7 +33,7 @@ with lib;
 
   services.nextcloud = {
     enable = true;
-    package = pkgs.nextcloud30;
+    package = pkgs.nextcloud31;
     hostName = "cloud.malobeo.org";
     config.adminpassFile = config.sops.secrets.nextcloudAdminPass.path;
     #https = true; #disable for testing
@@ -47,10 +47,10 @@ with lib;
     };
     extraAppsEnable = true;
     extraApps = {
-      inherit (config.services.nextcloud.package.packages.apps) contacts calendar deck polls registration;
-      collectives = pkgs.fetchNextcloudApp {
-        sha256 = "sha256-cj/8FhzxOACJaUEu0eG9r7iAQmnOG62yFHeyUICalFY=";
-        url = "https://github.com/nextcloud/collectives/releases/download/v2.15.2/collectives-2.15.2.tar.gz";
+      inherit (config.services.nextcloud.package.packages.apps) contacts calendar deck polls registration collectives forms;
+      appointments = pkgs.fetchNextcloudApp {
+        sha256 = "sha256-ls1rLnsX7U9wo2WkEtzhrvliTcWUl6LWXolE/9etJ78=";
+        url = "https://github.com/SergeyMosin/Appointments/raw/refs/tags/v2.4.3/build/artifacts/appstore/appointments.tar.gz";
         license = "agpl3Plus";
       };
     };
@@ -62,7 +62,7 @@ with lib;
     };
     phpOptions = {
       "realpath_cache_size" = "0";
-      "opcache.interned_strings_buffer" = "23";
+      "opcache.interned_strings_buffer" = "32";
     };
   };