diff --git a/pkgs/by-name/op/open-web-calendar/package.nix b/pkgs/by-name/op/open-web-calendar/package.nix
index 5e77b50f470b..0d8c0cc7cac9 100644
--- a/pkgs/by-name/op/open-web-calendar/package.nix
+++ b/pkgs/by-name/op/open-web-calendar/package.nix
@@ -12,7 +12,7 @@ let
 in
 python.pkgs.buildPythonApplication rec {
   pname = "open-web-calendar";
-  version = "1.42";
+  version = "1.48";
   pyproject = true;
 
   disabled = python.pythonOlder "3.9";
@@ -20,7 +20,7 @@ python.pkgs.buildPythonApplication rec {
   src = fetchPypi {
     inherit version;
     pname = "open_web_calendar";
-    hash = "sha256-w4XaT1+qIM80K6B+LIAeYdZzYIw4FYSd/nvWphOx460=";
+    hash = "sha256-SSe5vkrfTpUFdSLglBxo5//VZfuXYnWs5sUKJL2zWOw=";
   };
 
   # The Pypi tarball doesn't contain open_web_calendars/features
@@ -35,6 +35,7 @@ python.pkgs.buildPythonApplication rec {
   build-system = with python.pkgs; [
     hatchling
     hatch-vcs
+    hatch-requirements-txt
   ];
 
   dependencies =
@@ -44,6 +45,10 @@ python.pkgs.buildPythonApplication rec {
       flask-allowed-hosts
       flask
       icalendar
+      icalendar-compatibility
+      cryptography
+      bcrypt
+      caldav
       requests
       pyyaml
       recurring-ical-events
@@ -52,6 +57,7 @@ python.pkgs.buildPythonApplication rec {
       beautifulsoup4
       lxml-html-clean
       pytz
+      mergecal
     ]
     ++ requests.optional-dependencies.socks;