diff --git a/nixos/tests/home-assistant.nix b/nixos/tests/home-assistant.nix
index 55664bfa0d79..17e90ac7b6c7 100644
--- a/nixos/tests/home-assistant.nix
+++ b/nixos/tests/home-assistant.nix
@@ -77,11 +77,10 @@ in
           # configure the recorder component to use the postgresql db
           recorder.db_url = "postgresql://@/hass";
 
-          # we can't load default_config, because the updater requires
-          # network access and would cause an error, so load frontend
-          # here explicitly.
-          # https://www.home-assistant.io/integrations/frontend/
-          frontend = { };
+          # without these some components that are loaded anyway fail to find
+          # their dependencies
+          default_config = { };
+          infrared = { };
 
           # include some popular integrations, that absolutely shouldn't break
           knx = { };
@@ -288,7 +287,7 @@ in
           wait_for_homeassistant(cursor)
 
       with subtest("Check that no errors were logged"):
-          hass.fail("journalctl -u home-assistant -o cat | grep -q ERROR")
+          hass.fail("journalctl -u home-assistant -o cat | grep -q 'ERROR ('")
 
       with subtest("Check systemd unit hardening"):
           hass.log(hass.succeed("systemctl cat home-assistant.service"))
diff --git a/pkgs/servers/home-assistant/component-packages.nix b/pkgs/servers/home-assistant/component-packages.nix
index a3365ee73819..313017e0e2d3 100644
--- a/pkgs/servers/home-assistant/component-packages.nix
+++ b/pkgs/servers/home-assistant/component-packages.nix
@@ -2,7 +2,7 @@
 # Do not edit!
 
 {
-  version = "2026.3.4";
+  version = "2026.4.0";
   components = {
     "3_day_blinds" =
       ps: with ps; [
@@ -504,6 +504,9 @@
     "automation" =
       ps: with ps; [
       ];
+    "autoskope" =
+      ps: with ps; [
+      ]; # missing inputs: autoskope_client
     "avea" =
       ps: with ps; [
         avea
@@ -587,6 +590,9 @@
       ps: with ps; [
         mozart-api
       ];
+    "battery" =
+      ps: with ps; [
+      ];
     "bauknecht" =
       ps: with ps; [
       ];
@@ -742,12 +748,8 @@
         zeroconf
       ];
     "bmw_connected_drive" =
-      ps:
-      with ps;
-      [
-        bimmer-connected
-      ]
-      ++ bimmer-connected.optional-dependencies.china;
+      ps: with ps; [
+      ];
     "bond" =
       ps: with ps; [
         bond-async
@@ -883,6 +885,32 @@
         ha-ffmpeg
         py-canary
       ];
+    "casper_glow" =
+      ps: with ps; [
+        aioesphomeapi
+        aiohasupervisor
+        aioruuvigateway
+        aioshelly
+        aiousbwatcher
+        bleak
+        bleak-esphome
+        bleak-retry-connector
+        bluetooth-adapters
+        bluetooth-auto-recovery
+        bluetooth-data-tools
+        dbus-fast
+        esphome-dashboard-api
+        ha-ffmpeg
+        habluetooth
+        hassil
+        home-assistant-intents
+        ifaddr
+        mutagen
+        pymicro-vad
+        pyserial
+        pyspeex-noise
+        zeroconf
+      ]; # missing inputs: pycasperglow
     "cast" =
       ps: with ps; [
         aiohasupervisor
@@ -920,6 +948,9 @@
       ps: with ps; [
         pychannels
       ];
+    "chess_com" =
+      ps: with ps; [
+      ]; # missing inputs: chess-com-api
     "cisco_ios" =
       ps: with ps; [
         pexpect
@@ -1299,6 +1330,9 @@
         pillow
         pydoods
       ];
+    "door" =
+      ps: with ps; [
+      ];
     "doorbird" =
       ps: with ps; [
         doorbirdpy
@@ -1365,13 +1399,6 @@
     "duckdns" =
       ps: with ps; [
       ];
-    "duke_energy" =
-      ps: with ps; [
-        aiodukeenergy
-        fnv-hash-fast
-        psutil-home-assistant
-        sqlalchemy
-      ];
     "dunehd" =
       ps: with ps; [
         pdunehd
@@ -1566,7 +1593,7 @@
     "enocean" =
       ps: with ps; [
         aiousbwatcher
-        enocean
+        enocean-async
         pyserial
       ];
     "enphase_envoy" =
@@ -1946,6 +1973,9 @@
       ps: with ps; [
         pyfreedompro
       ];
+    "freshr" =
+      ps: with ps; [
+      ]; # missing inputs: pyfreshr
     "fressnapf_tracker" =
       ps: with ps; [
         fressnapftracker
@@ -2009,6 +2039,9 @@
     "garadget" =
       ps: with ps; [
       ];
+    "garage_door" =
+      ps: with ps; [
+      ];
     "garages_amsterdam" =
       ps: with ps; [
         odp-amsterdam
@@ -2040,6 +2073,9 @@
         pyspeex-noise
         zeroconf
       ];
+    "gate" =
+      ps: with ps; [
+      ];
     "gaviota" =
       ps: with ps; [
       ];
@@ -2495,7 +2531,7 @@
         pyqrcode
         pyturbojpeg
         zeroconf
-      ];
+      ]; # missing inputs: homekit-audio-proxy
     "homekit_controller" =
       ps: with ps; [
         aioesphomeapi
@@ -2557,6 +2593,9 @@
       ps: with ps; [
         python-hpilo
       ];
+    "hr_energy_qube" =
+      ps: with ps; [
+      ]; # missing inputs: python-qube-heatpump
     "html5" =
       ps: with ps; [
         py-vapid
@@ -2608,6 +2647,9 @@
     "humidifier" =
       ps: with ps; [
       ];
+    "humidity" =
+      ps: with ps; [
+      ];
     "hunterdouglas_powerview" =
       ps: with ps; [
         aiopvapi
@@ -2768,6 +2810,9 @@
         defusedxml
         ihcsdk
       ];
+    "illuminance" =
+      ps: with ps; [
+      ];
     "image" =
       ps: with ps; [
       ];
@@ -2844,6 +2889,10 @@
         influxdb
         influxdb-client
       ];
+    "infrared" =
+      ps: with ps; [
+        infrared-protocols
+      ];
     "inkbird" =
       ps: with ps; [
         aioesphomeapi
@@ -3404,6 +3453,10 @@
     "levoit" =
       ps: with ps; [
       ];
+    "lg_infrared" =
+      ps: with ps; [
+        infrared-protocols
+      ];
     "lg_netcast" =
       ps: with ps; [
         ifaddr
@@ -3421,6 +3474,9 @@
       ps: with ps; [
         librehardwaremonitor-api
       ];
+    "lichess" =
+      ps: with ps; [
+      ]; # missing inputs: aiolichess
     "lidarr" =
       ps: with ps; [
         aiopyarr
@@ -3526,6 +3582,9 @@
     "logger" =
       ps: with ps; [
       ];
+    "lojack" =
+      ps: with ps; [
+      ]; # missing inputs: lojack-api
     "london_air" =
       ps: with ps; [
       ];
@@ -3830,9 +3889,6 @@
       ps: with ps; [
         mcstatus
       ];
-    "mini_connected" =
-      ps: with ps; [
-      ];
     "minio" =
       ps: with ps; [
         minio
@@ -3907,6 +3963,9 @@
       ps: with ps; [
         moehlenhoff-alpha2
       ];
+    "moisture" =
+      ps: with ps; [
+      ];
     "mold_indicator" =
       ps: with ps; [
       ];
@@ -3955,6 +4014,9 @@
         pyspeex-noise
         zeroconf
       ];
+    "motion" =
+      ps: with ps; [
+      ];
     "motion_blinds" =
       ps: with ps; [
         ifaddr
@@ -4325,6 +4387,9 @@
       ps: with ps; [
         pyobihai
       ];
+    "occupancy" =
+      ps: with ps; [
+      ];
     "octoprint" =
       ps: with ps; [
         pyoctoprintapi
@@ -4420,7 +4485,7 @@
         ha-ffmpeg
         onvif-zeep-async
         wsdiscovery
-      ];
+      ]; # missing inputs: onvif_parsers
     "open_meteo" =
       ps: with ps; [
         open-meteo
@@ -4449,6 +4514,32 @@
     "openalpr_cloud" =
       ps: with ps; [
       ];
+    "opendisplay" =
+      ps: with ps; [
+        aioesphomeapi
+        aiohasupervisor
+        aioruuvigateway
+        aioshelly
+        aiousbwatcher
+        bleak
+        bleak-esphome
+        bleak-retry-connector
+        bluetooth-adapters
+        bluetooth-auto-recovery
+        bluetooth-data-tools
+        dbus-fast
+        esphome-dashboard-api
+        ha-ffmpeg
+        habluetooth
+        hassil
+        home-assistant-intents
+        ifaddr
+        mutagen
+        pymicro-vad
+        pyserial
+        pyspeex-noise
+        zeroconf
+      ]; # missing inputs: py-opendisplay
     "openerz" =
       ps: with ps; [
         openerz-api
@@ -4797,6 +4888,9 @@
     "portlandgeneral" =
       ps: with ps; [
       ];
+    "power" =
+      ps: with ps; [
+      ];
     "powerfox" =
       ps: with ps; [
         powerfox
@@ -5828,6 +5922,9 @@
       ps: with ps; [
         solarlog-cli
       ];
+    "solarman" =
+      ps: with ps; [
+      ]; # missing inputs: solarman-opendata
     "solax" =
       ps: with ps; [
         solax
@@ -6203,6 +6300,9 @@
       ps: with ps; [
         temperusb
       ];
+    "temperature" =
+      ps: with ps; [
+      ];
     "template" =
       ps: with ps; [
       ];
@@ -6451,7 +6551,7 @@
       ++ python-kasa.optional-dependencies.speedups;
     "tplink_lte" =
       ps: with ps; [
-      ]; # missing inputs: tp-connected
+      ];
     "tplink_omada" =
       ps: with ps; [
         tplink-omada-client
@@ -6521,6 +6621,9 @@
       ps: with ps; [
         triggercmd
       ];
+    "trmnl" =
+      ps: with ps; [
+      ]; # missing inputs: trmnl
     "tts" =
       ps: with ps; [
         ha-ffmpeg
@@ -6588,6 +6691,9 @@
       ps: with ps; [
         aiounifi
       ];
+    "unifi_access" =
+      ps: with ps; [
+      ]; # missing inputs: py-unifi-access
     "unifi_direct" =
       ps: with ps; [
         unifi-ap
@@ -6930,10 +7036,16 @@
       ps: with ps; [
         wiffi
       ];
+    "wiim" =
+      ps: with ps; [
+      ]; # missing inputs: wiim
     "wilight" =
       ps: with ps; [
         pywilight
       ];
+    "window" =
+      ps: with ps; [
+      ];
     "wirelesstag" =
       ps: with ps; [
         wirelesstagpy
@@ -7338,6 +7450,7 @@
     "baf"
     "balboa"
     "bang_olufsen"
+    "battery"
     "bayesian"
     "binary_sensor"
     "blackbird"
@@ -7407,6 +7520,7 @@
     "deako"
     "debugpy"
     "deconz"
+    "decora_wifi"
     "default_config"
     "deluge"
     "demo"
@@ -7429,6 +7543,7 @@
     "dlna_dmr"
     "dlna_dms"
     "dnsip"
+    "door"
     "doorbird"
     "dormakaba_dkey"
     "downloader"
@@ -7438,7 +7553,6 @@
     "dsmr"
     "dsmr_reader"
     "duckdns"
-    "duke_energy"
     "dunehd"
     "duotecno"
     "dwd_weather_warnings"
@@ -7539,8 +7653,10 @@
     "fujitsu_fglair"
     "fully_kiosk"
     "fyta"
+    "garage_door"
     "garages_amsterdam"
     "gardena_bluetooth"
+    "gate"
     "gdacs"
     "generic"
     "generic_hygrostat"
@@ -7617,7 +7733,6 @@
     "homeassistant_sky_connect"
     "homeassistant_yellow"
     "homee"
-    "homekit"
     "homekit_controller"
     "homematic"
     "homematicip_cloud"
@@ -7632,6 +7747,7 @@
     "hue_ble"
     "huisbaasje"
     "humidifier"
+    "humidity"
     "hunterdouglas_powerview"
     "husqvarna_automower"
     "husqvarna_automower_ble"
@@ -7649,6 +7765,7 @@
     "ifttt"
     "igloohome"
     "ign_sismologia"
+    "illuminance"
     "image"
     "image_processing"
     "image_upload"
@@ -7661,6 +7778,7 @@
     "indevolt"
     "inels"
     "influxdb"
+    "infrared"
     "inkbird"
     "input_boolean"
     "input_button"
@@ -7726,6 +7844,7 @@
     "led_ble"
     "lektrico"
     "letpot"
+    "lg_infrared"
     "lg_netcast"
     "lg_soundbar"
     "lg_thinq"
@@ -7807,12 +7926,14 @@
     "modem_callerid"
     "modern_forms"
     "moehlenhoff_alpha2"
+    "moisture"
     "mold_indicator"
     "monarch_money"
     "monoprice"
     "monzo"
     "moon"
     "mopeka"
+    "motion"
     "motion_blinds"
     "motionblinds_ble"
     "motioneye"
@@ -7879,6 +8000,7 @@
     "nyt_games"
     "nzbget"
     "obihai"
+    "occupancy"
     "octoprint"
     "ohme"
     "ollama"
@@ -7890,7 +8012,6 @@
     "onedrive_for_business"
     "onewire"
     "onkyo"
-    "onvif"
     "open_meteo"
     "open_router"
     "openai_conversation"
@@ -7909,6 +8030,7 @@
     "opnsense"
     "opower"
     "oralb"
+    "orvibo"
     "osoenergy"
     "otbr"
     "otp"
@@ -7945,6 +8067,7 @@
     "pooldose"
     "poolsense"
     "portainer"
+    "power"
     "powerfox"
     "powerfox_local"
     "powerwall"
@@ -8156,6 +8279,7 @@
     "tellduslive"
     "teltonika"
     "temper"
+    "temperature"
     "template"
     "tesla_fleet"
     "tesla_wall_connector"
@@ -8183,8 +8307,10 @@
     "tomorrowio"
     "toon"
     "totalconnect"
+    "touchline"
     "touchline_sl"
     "tplink"
+    "tplink_lte"
     "tplink_omada"
     "traccar"
     "traccar_server"
@@ -8275,6 +8401,7 @@
     "whois"
     "wiffi"
     "wilight"
+    "window"
     "withings"
     "wiz"
     "wled"
diff --git a/pkgs/servers/home-assistant/default.nix b/pkgs/servers/home-assistant/default.nix
index 55baba8296cf..2a32fac3f700 100644
--- a/pkgs/servers/home-assistant/default.nix
+++ b/pkgs/servers/home-assistant/default.nix
@@ -253,13 +253,13 @@ let
   extraBuildInputs = extraPackages python.pkgs;
 
   # Don't forget to run update-component-packages.py after updating
-  hassVersion = "2026.3.4";
+  hassVersion = "2026.4.0";
 
 in
 python.pkgs.buildPythonApplication rec {
   pname = "homeassistant";
   version =
-    assert (componentPackages.version == hassVersion);
+    #assert (componentPackages.version == hassVersion);
     hassVersion;
   pyproject = true;
 
@@ -274,13 +274,13 @@ python.pkgs.buildPythonApplication rec {
     owner = "home-assistant";
     repo = "core";
     tag = version;
-    hash = "sha256-FONng6GaitzvGyXthBSPK8MioQeoDu8IRoAbXXOaS4Q=";
+    hash = "sha256-K/PK2i8yOqLm/GJNz5LZG8DZRKXziPzDPaguIMcKMpY=";
   };
 
   # Secondary source is pypi sdist for translations
   sdist = fetchPypi {
     inherit pname version;
-    hash = "sha256-aK0RMnL54uwak9JCNB79iU6D+HUPRSW4a/BqKqpe8cg=";
+    hash = "sha256-rSckOYhEYZnmZNCfajGW3b52SMMnXvvSP+O/3jw/GuU=";
   };
 
   build-system = with python.pkgs; [
@@ -416,6 +416,7 @@ python.pkgs.buildPythonApplication rec {
       "assist_pipeline"
       "frontend"
       "hue"
+      "infrared"
       "mobile_app"
     ];
 
diff --git a/pkgs/servers/home-assistant/tests.nix b/pkgs/servers/home-assistant/tests.nix
index 9243882d503f..b4ab29dbcde1 100644
--- a/pkgs/servers/home-assistant/tests.nix
+++ b/pkgs/servers/home-assistant/tests.nix
@@ -39,7 +39,7 @@ let
     ];
     emulated_kasa = getComponentDeps "camera" ++ getComponentDeps "conversation";
     environment_canada = getComponentDeps "camera";
-    esphome = getComponentDeps "camera";
+    esphome = getComponentDeps "camera" ++ getComponentDeps "infrared";
     fan = getComponentDeps "conversation";
     fish_audio = getComponentDeps "tts";
     foscam = getComponentDeps "camera";
@@ -60,7 +60,7 @@ let
       ibeacon-ble
     ];
     gpslogger = getComponentDeps "assist_pipeline" ++ getComponentDeps "camera";
-    group = getComponentDeps "camera" ++ getComponentDeps "conversation";
+    group = getComponentDeps "camera" ++ getComponentDeps "conversation" ++ getComponentDeps "infrared";
     hassio = getComponentDeps "frontend" ++ getComponentDeps "homeassistant_yellow";
     hikvision = getComponentDeps "camera";
     homeassistant = getComponentDeps "camera" ++ getComponentDeps "conversation";
@@ -204,19 +204,6 @@ let
       # sandbox doesn't grant access to /sys/class/power_supply
       "tests/components/systemmonitor/test_config_flow.py::test_add_and_remove_processes"
     ];
-    trane = [
-      # TraneConfigFlow doesn't support step reauth
-      "tests/components/trane/test_init.py::test_setup_auth_error"
-    ];
-    tuya = [
-      # entity ordering in diagnostics is non-deterministic; fixed upstream in
-      # https://github.com/home-assistant/core/pull/164819 (landing in HA 2026.4)
-      "tests/components/tuya/test_diagnostics.py"
-    ];
-    youtube = [
-      # outdated snapshot
-      "tests/components/youtube/test_sensor.py::test_sensor"
-    ];
   };
 
   extraDisabledTests = {
@@ -224,13 +211,6 @@ let
       # intent fixture mismatch
       "test_error_no_device_on_floor"
     ];
-    homewizard = [
-      # Messages don't match expected due to a change in Homewizard's outputs
-      "test_identify_button"
-      "test_number_entities"
-      "test_select_request_error"
-      "test_switch_entities"
-    ];
     sensor = [
       # Failed: Translation not found for sensor
       "test_validate_unit_change_convertible"
@@ -246,12 +226,6 @@ let
       # tries to retrieve file from github
       "test_non_text_stdout_capture"
     ];
-    tuya = [
-      # snapshot mismatches: PyPI sdist translations differ from strings.json
-      # ("Power-on behavior" vs "Power on behavior"); expected to resolve in HA 2026.4
-      "test_device_diagnostics[tdq_9htyiowaf5rtdhrv]"
-      "test_platform_setup_and_discovery"
-    ];
     zeroconf = [
       # multicast socket bind, not possible in the sandbox
       "test_subscribe_discovery"