diff --git a/pkgs/development/python-modules/caldav/default.nix b/pkgs/development/python-modules/caldav/default.nix
index d1e520aac493..f531cb4f0efc 100644
--- a/pkgs/development/python-modules/caldav/default.nix
+++ b/pkgs/development/python-modules/caldav/default.nix
@@ -14,13 +14,13 @@
 
 buildPythonPackage rec {
   pname = "caldav";
-  version = "0.11.0";
+  version = "1.0.1";
 
   src = fetchFromGitHub {
     owner = "python-caldav";
     repo = pname;
     rev = "refs/tags/v${version}";
-    hash = "sha256-fTl2mxQncsITSC8XpcCBYWYmjDboiueGkNGHbQxn+F8=";
+    hash = "sha256-1BGy4h0TpeiUNtUnj/BiGSfH4T9YXP8YGJ1+4UsRGug=";
   };
 
   propagatedBuildInputs = [
diff --git a/pkgs/development/python-modules/recurring-ical-events/default.nix b/pkgs/development/python-modules/recurring-ical-events/default.nix
index a40b4a089e11..989be20e4b0f 100644
--- a/pkgs/development/python-modules/recurring-ical-events/default.nix
+++ b/pkgs/development/python-modules/recurring-ical-events/default.nix
@@ -13,7 +13,7 @@
 
 buildPythonPackage rec {
   pname = "recurring-ical-events";
-  version = "1.1.0b0";
+  version = "2.0.0";
 
   format = "setuptools";
 
@@ -21,7 +21,7 @@ buildPythonPackage rec {
     owner = "niccokunzmann";
     repo = "python-recurring-ical-events";
     rev = "v${version}";
-    hash = "sha256-ePbyZd/l/O3p/6Mbq1kMFsktkFKpPAw/u7uUynZYP2Y=";
+    hash = "sha256-B6oLy4Ai30SGGTgGcO0V+f1mf1P1W8sMpzk7oIUtcJY=";
   };
 
   propagatedBuildInputs = [
@@ -41,6 +41,7 @@ buildPythonPackage rec {
   pythonImportsCheck = [ "recurring_ical_events" ];
 
   meta = {
+    changelog = "https://github.com/niccokunzmann/python-recurring-ical-events/blob/${src.rev}/README.rst#changelog";
     description = "Repeat ICalendar events by RRULE, RDATE and EXDATE";
     homepage = "https://github.com/niccokunzmann/python-recurring-ical-events";
     license = lib.licenses.lgpl3Plus;
diff --git a/pkgs/servers/home-assistant/default.nix b/pkgs/servers/home-assistant/default.nix
index 98201ef05641..586631f6ffda 100644
--- a/pkgs/servers/home-assistant/default.nix
+++ b/pkgs/servers/home-assistant/default.nix
@@ -85,6 +85,15 @@ let
         };
       });
 
+      icalendar = super.icalendar.overridePythonAttrs (oldAttrs: rec {
+        version = "4.1.0";
+        src = self.fetchPypi {
+          inherit (oldAttrs) pname;
+          inherit version;
+          hash = "sha256-l0i3wC78xD5Y0GFa4JdqxPJl6Q2t7ptPiE3imQXBs5U=";
+        };
+      });
+
       # Pinned due to API changes in 0.1.0
       poolsense = super.poolsense.overridePythonAttrs (oldAttrs: rec {
         version = "0.0.8";