diff --git a/.gitmodules b/.gitmodules
index 8791f9c..26dd48f 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -17,3 +17,9 @@
 [submodule "files_fulltextsearch"]
 	path = files_fulltextsearch
 	url = https://github.com/nextcloud/files_fulltextsearch.git
+[submodule "ical.js"]
+	path = ical.js
+	url = https://github.com/kewisch/ical.js.git
+[submodule "calendar-js"]
+	path = calendar-js
+	url = https://github.com/nextcloud/calendar-js.git
diff --git a/calendar b/calendar
index 56467f0..04eeeaa 160000
--- a/calendar
+++ b/calendar
@@ -1 +1 @@
-Subproject commit 56467f051c18b638b134335973f4cd2ab4f90927
+Subproject commit 04eeeaabab222fb35a96bc43b5723e8f7d3607a4
diff --git a/flake.nix b/flake.nix
index f62700a..9be0be2 100644
--- a/flake.nix
+++ b/flake.nix
@@ -21,6 +21,7 @@
             phpPackages.composer
             phpunit
             nodejs
+	    nodePackages.rollup
           ];
         };
         packages = { inherit start; };
diff --git a/vm-nextcloud.nix b/vm-nextcloud.nix
index 8075f71..bf7616f 100644
--- a/vm-nextcloud.nix
+++ b/vm-nextcloud.nix
@@ -43,12 +43,23 @@
     package = pkgs.nextcloud27;
     hostName = "localhost";
     extraApps = with config.services.nextcloud.package.packages.apps; {
-      inherit contacts polls;
-      # hmr_enable = pkgs.fetchNextcloudApp rec {
-      #   url = "https://github.com/nextcloud/hmr_enabler/archive/852acc47c64db1be85051197bf7939298059fe09.zip";
-      #   sha256 = "sha256-eTc51pkg3OdHJB7X4/hD39Ce+9vKzw1nlJ7BhPOzlll=";
-
-      # };
+      inherit contacts;
+      hmr_enabler = pkgs.php.buildComposerProject (finalAttrs: {
+        pname = "hmr_enabler";
+        version = "1.0.0";
+        src = pkgs.fetchFromGitHub {
+          owner = "onny";
+          repo = "hmr_enabler";
+          rev = "85404e232344c856133e0b14e3ea30bbb8118034";
+          hash = "sha256-mxUTWQozqcnTnlHrUtfUcsAX+X/N0fcLiUec4cGjGdg=";
+        };
+        composerNoDev = false;
+        vendorHash = "sha256-ENfs9gsXtrWP7u8+LKDMQ+hhiP3UKtn6t5lPl6wKOdQ=";
+        postInstall = ''
+          cp -r $out/share/php/hmr_enabler/* $out/
+          rm -r $out/share
+        '';
+      });
     };
     extraAppsEnable = true;
     config = {