diff --git a/.ruff.toml b/.ruff.toml
index 7d379ff4623..fb6aec7ca3f 100644
--- a/.ruff.toml
+++ b/.ruff.toml
@@ -8,14 +8,22 @@ select = [
   "E",      # pycodestyles
   "W",      # pycodestyles
   "F",      # pyflakes
+  "FURB",   # refurb
   "I",      # isort
+  "PERF",   # Perflint
   "PGH",    # pygrep-hooks
   "PLC",    # pylint conventions
   "PLE",    # pylint errors
+  "PLR",    # pylint refactor
+  "PTH",    # Use pathlib
+  "RUF",    # Ruff rules
+  "TRY",    # Exception related lints
   "UP",     # pyupgrade
 ]
 ignore = [
   "E402",  # module import not at top of file
+  "PLR2004", # Magic value used in comparison
+  "TRY003", # Avoid specifying long messages outside the exception class
   "UP038",  # Use X | Y in isinstance check instead of (X, Y)
 ]
 
diff --git a/src/pyodide/internal/asgi.py b/src/pyodide/internal/asgi.py
index 060ed74729f..5aacd1e37d3 100644
--- a/src/pyodide/internal/asgi.py
+++ b/src/pyodide/internal/asgi.py
@@ -7,6 +7,15 @@
 ASGI = {"spec_version": "2.0", "version": "3.0"}
 
 
+background_tasks = set()
+
+
+def run_in_background(coro):
+    fut = ensure_future(coro)
+    background_tasks.add(fut)
+    fut.add_done_callback(background_tasks.discard)
+
+
 @Depends
 async def env(request: Request):
     return request.scope["env"]
@@ -78,7 +87,7 @@ async def send(got):
             print("Application shutdown complete")
         raise RuntimeError(f"Unexpected lifespan event {got['type']}")
 
-    ensure_future(
+    run_in_background(
         app(
             {
                 "asgi": ASGI,
@@ -184,7 +193,7 @@ async def ws_receive():
         return received
 
     env = {}
-    ensure_future(app(request_to_scope(req, env, ws=True), ws_receive, ws_send))
+    run_in_background(app(request_to_scope(req, env, ws=True), ws_receive, ws_send))
 
     return Response.new(None, status=101, webSocket=client)
 
diff --git a/src/pyodide/internal/patches/httpx.py b/src/pyodide/internal/patches/httpx.py
index 1ef76c61e5b..9e4ff509a1c 100644
--- a/src/pyodide/internal/patches/httpx.py
+++ b/src/pyodide/internal/patches/httpx.py
@@ -53,7 +53,7 @@ async def _send_single_request(self, request: Request) -> Response:
     await timer.async_start()
 
     if not isinstance(request.stream, AsyncByteStream):
-        raise RuntimeError(
+        raise TypeError(
             "Attempted to send an sync request with an AsyncClient instance."
         )
 
diff --git a/src/pyodide/internal/topLevelEntropy/entropy_import_context.py b/src/pyodide/internal/topLevelEntropy/entropy_import_context.py
index e4b66431834..e9594beb146 100644
--- a/src/pyodide/internal/topLevelEntropy/entropy_import_context.py
+++ b/src/pyodide/internal/topLevelEntropy/entropy_import_context.py
@@ -26,7 +26,8 @@
     "numpy.random.mtrand",
     "tempfile",
     "aiohttp.http_websocket",
-] + RUST_PACKAGES
+    *RUST_PACKAGES,
+]
 
 # Control number of allowed entropy calls.
 
@@ -76,7 +77,7 @@ def get_entropy_import_context(name):
         # Initial import needs one entropy call to initialize
         # std::collections::HashMap hash seed
         return rust_package_context
-    raise Exception(f"Missing context for {name}")
+    raise RuntimeError(f"Missing context for {name}")
 
 
 @contextmanager
diff --git a/tools/cross/format.py b/tools/cross/format.py
index f43ce957b8b..96f9bcdc464 100644
--- a/tools/cross/format.py
+++ b/tools/cross/format.py
@@ -8,6 +8,7 @@
 from argparse import ArgumentParser, Namespace
 from dataclasses import dataclass
 from pathlib import Path
+from sys import exit
 from typing import Callable, Optional
 
 CLANG_FORMAT = os.environ.get("CLANG_FORMAT", "clang-format")
@@ -80,7 +81,7 @@ def check_clang_format() -> None:
             exit(1)
     except FileNotFoundError:
         # Clang-format is not in the PATH
-        logging.error("clang-format not found in the PATH")
+        logging.exception("clang-format not found in the PATH")
         exit(1)