diff --git a/homecore_controller/CHANGELOG.md b/homecore_controller/CHANGELOG.md
index c01491c..b72636a 100644
--- a/homecore_controller/CHANGELOG.md
+++ b/homecore_controller/CHANGELOG.md
@@ -1,5 +1,14 @@
 # HomeCore Controller Changelog
 
+## 0.1.13
+
+- Fixes HomeCore self-update architecture for Home Assistant OS.
+- Home Assistant Supervisor intentionally blocks an app from updating itself directly.
+- HomeCore now asks Home Assistant Core to run the supported `update.install` action for the HomeCore Controller update entity.
+- Keeps repository validation, backup-before-update, restart recovery and completion reporting.
+- Automatic rollout remains disabled; deployment is still manual and per-controller from HomeCore Admin.
+- No functional home-control changes from 0.1.12.
+
 ## 0.1.12
 
 - End-to-end validation release for HomeCore Admin manual per-controller updating using the Supervisor `admin` API role.
diff --git a/homecore_controller/app/main.py b/homecore_controller/app/main.py
index cfcb80b..8394711 100644
--- a/homecore_controller/app/main.py
+++ b/homecore_controller/app/main.py
@@ -16,7 +16,7 @@ from cryptography.hazmat.primitives import serialization
 import uvicorn
 from updater import start_update_manager
 
-VERSION = "0.1.12"
+VERSION = "0.1.13"
 
 print(
     "HOMECORE SUPERVISOR: token "
diff --git a/homecore_controller/app/updater.py b/homecore_controller/app/updater.py
index 08a0e58..4b61d6f 100644
--- a/homecore_controller/app/updater.py
+++ b/homecore_controller/app/updater.py
@@ -62,6 +62,74 @@ def supervisor_request(method, path, payload=None, timeout=90):
     return body
 
 
+HOME_ASSISTANT_API = "http://supervisor/core/api"
+
+
+def homeassistant_request(method, path, payload=None, timeout=90):
+    r = httpx.request(
+        method,
+        HOME_ASSISTANT_API + path,
+        headers=supervisor_headers(),
+        json=payload,
+        timeout=timeout,
+    )
+    r.raise_for_status()
+
+    try:
+        return r.json()
+    except Exception:
+        return {}
+
+
+def find_homecore_update_entity(current_version, target_version):
+    states = homeassistant_request("GET", "/states", timeout=30)
+    if not isinstance(states, list):
+        raise RuntimeError("Home Assistant did not return entity states")
+
+    candidates = []
+
+    for state in states:
+        entity_id = str(state.get("entity_id", ""))
+        if not entity_id.startswith("update."):
+            continue
+
+        attrs = state.get("attributes") or {}
+        title = str(attrs.get("title") or "")
+        friendly = str(attrs.get("friendly_name") or "")
+        installed = str(attrs.get("installed_version") or "")
+        latest = str(attrs.get("latest_version") or "")
+
+        name_match = (
+            "homecore controller" in title.lower()
+            or "homecore controller" in friendly.lower()
+        )
+
+        version_match = (
+            installed == current_version
+            and latest == target_version
+        )
+
+        if name_match:
+            candidates.append((state, version_match))
+
+    exact = [state for state, version_match in candidates if version_match]
+    if exact:
+        return exact[0]
+
+    if len(candidates) == 1:
+        return candidates[0][0]
+
+    if not candidates:
+        raise RuntimeError(
+            "HomeCore Controller update entity was not found in Home Assistant"
+        )
+
+    raise RuntimeError(
+        "Multiple HomeCore Controller update entities were found; "
+        "cannot choose safely"
+    )
+
+
 def find_homecore_app():
     data = supervisor_request("GET", "/store/addons")
 
@@ -321,17 +389,44 @@ class HomeCoreUpdateManager:
             "Backup requested; Supervisor update starting",
         )
 
-        supervisor_request(
+        update_entity = find_homecore_update_entity(
+            self.current_version,
+            target,
+        )
+        update_entity_id = str(update_entity.get("entity_id", "")).strip()
+
+        if not update_entity_id:
+            raise RuntimeError(
+                "HomeCore Controller update entity ID is missing"
+            )
+
+        print(
+            "HOMECORE UPDATE: Home Assistant update action "
+            f"entity={update_entity_id} target={target}",
+            flush=True,
+        )
+
+        # Home Assistant Supervisor deliberately blocks an app from calling
+        # its own /store/addons/<slug>/update endpoint. Ask Home Assistant Core
+        # to execute the normal update.install action instead. Core performs
+        # the Supervisor update, exactly as if an administrator installed the
+        # app update from the Home Assistant UI.
+        #
+        # The state above is written before this call because updating this
+        # app stops the current container. On restart, mark_completed_if_required
+        # reports completion back to HomeCore Admin.
+        homeassistant_request(
             "POST",
-            f"/store/addons/{slug}/update",
+            "/services/update/install",
             {
+                "entity_id": update_entity_id,
                 "backup": True,
-                "background": True,
             },
+            timeout=300,
         )
 
         print(
-            "HOMECORE UPDATE: Supervisor accepted manual update job",
+            "HOMECORE UPDATE: Home Assistant accepted manual update action",
             flush=True,
         )
 
diff --git a/homecore_controller/config.yaml b/homecore_controller/config.yaml
index ce1ffdc..841f809 100644
--- a/homecore_controller/config.yaml
+++ b/homecore_controller/config.yaml
@@ -1,5 +1,5 @@
 name: HomeCore Controller
-version: "0.1.12"
+version: "0.1.13"
 slug: homecore_controller
 description: HomeCore local controller agent for Home Assistant Green.
 url: https://homecore.home-core.co.uk