diff --git a/docs/modules/indicator.md b/docs/modules/indicator.md
index 25ba7d5..2c9ba3c 100644
--- a/docs/modules/indicator.md
+++ b/docs/modules/indicator.md
@@ -710,7 +710,7 @@ finally:
   (synchronous) and D-Bus calls (asynchronous) to run cooperatively in a
   single thread
 - The `_schedule()` pattern in `IndicatorApp` bridges sync GTK callbacks to
-  async coroutines by wrapping them in `asyncio.ensure_future()` and storing
+  async coroutines by wrapping them in `asyncio.create_task()` and storing
   task references to prevent garbage collection
 - Auto-reconnection: when the daemon exits or crashes, the client detects the
   `NameOwnerChanged` signal and retries the connection at a configurable
diff --git a/docs/modules/notifier.md b/docs/modules/notifier.md
index f1e1eb0..27da948 100644
--- a/docs/modules/notifier.md
+++ b/docs/modules/notifier.md
@@ -135,7 +135,7 @@ Uses a two-level cache:
 1. **In-memory** (`_avatar_cache`): instant lookup for avatars already downloaded
    this session
 2. **On-disk** (`_AVATAR_CACHE_DIR`): persists across restarts via deterministic
-   filenames (MD5 hash of the URL)
+   filenames (SHA-256 hash of the URL)
 
 The caller provides a shared `aiohttp.ClientSession` so that avatar downloads
 within a notification batch reuse the same HTTP connection.
@@ -273,7 +273,7 @@ await notify_new_prs(diff.new_prs, grouping="repo", repo_overrides=overrides)
   when the portal is unavailable. The portal approach is necessary because
   `xdg-open` fails silently inside the systemd sandbox when the browser is a
   Snap package (Snap's `snap-confine` rejects the restricted permissions)
-- Author avatars are downloaded from GitHub, cached on disk (MD5-hashed
+- Author avatars are downloaded from GitHub, cached on disk (SHA-256-hashed
   filenames), and passed to `notify-send` via `--icon={path}`. A shared
   `aiohttp.ClientSession` is used for all avatar downloads within a
   notification batch to avoid creating a new session per avatar
diff --git a/forgewatch/indicator/app.py b/forgewatch/indicator/app.py
index 603a7f8..ca6bc21 100644
--- a/forgewatch/indicator/app.py
+++ b/forgewatch/indicator/app.py
@@ -226,7 +226,7 @@ def _schedule(self, coro: Coroutine[object, object, None]) -> None:
         The task reference is stored in ``_tasks`` to prevent garbage
         collection before the coroutine completes.
         """
-        task = asyncio.ensure_future(coro)
+        task = asyncio.create_task(coro)
         self._tasks.add(task)
         task.add_done_callback(self._task_done)
 
diff --git a/forgewatch/indicator/client.py b/forgewatch/indicator/client.py
index ab6da76..53f96f4 100644
--- a/forgewatch/indicator/client.py
+++ b/forgewatch/indicator/client.py
@@ -258,7 +258,7 @@ def _fire() -> None:
             # a failed connect() -> _set_disconnected() -> _schedule_reconnect()
             # chain can schedule a fresh timer instead of bailing out.
             self._reconnect_handle = None
-            asyncio.ensure_future(self.connect())  # noqa: RUF006
+            asyncio.create_task(self.connect())  # noqa: RUF006
 
         self._reconnect_handle = loop.call_later(self._reconnect_interval, _fire)
         logger.debug("Reconnect scheduled in %ds", self._reconnect_interval)
diff --git a/forgewatch/notifier.py b/forgewatch/notifier.py
index 3e69900..784c8a9 100644
--- a/forgewatch/notifier.py
+++ b/forgewatch/notifier.py
@@ -78,7 +78,7 @@ async def _download_avatar(avatar_url: str, session: aiohttp.ClientSession) -> s
     _AVATAR_CACHE_DIR.mkdir(parents=True, exist_ok=True)
 
     # Deterministic filename from URL
-    url_hash = hashlib.md5(avatar_url.encode()).hexdigest()  # noqa: S324
+    url_hash = hashlib.sha256(avatar_url.encode()).hexdigest()
     dest = _AVATAR_CACHE_DIR / f"{url_hash}.png"
 
     # If already on disk (from a previous run), reuse
diff --git a/tests/test_notifier.py b/tests/test_notifier.py
index ec319a5..2a6a253 100644
--- a/tests/test_notifier.py
+++ b/tests/test_notifier.py
@@ -780,7 +780,7 @@ async def test_disk_cache_hit(self, tmp_path: Path) -> None:
         from forgewatch import notifier
 
         avatar_url = "https://avatars.githubusercontent.com/u/disk-cache-1"
-        url_hash = hashlib.md5(avatar_url.encode()).hexdigest()  # noqa: S324
+        url_hash = hashlib.sha256(avatar_url.encode()).hexdigest()
         cached_file = tmp_path / f"{url_hash}.png"
         cached_file.write_bytes(b"\x89PNG old data")