diff --git a/pyproject.toml b/pyproject.toml
index b8d9067f9..7caad834d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -273,9 +273,25 @@ markers = [
     "requires_internet: marks tests that need real Internet access",
 ]
 filterwarnings = [
+    "error",
     "ignore::DeprecationWarning:twisted.web.static",
-    # Twisted doesn't close failed sockets after CannotListenError: https://github.com/twisted/twisted/issues/6108
-    "ignore:Exception ignored in. <socket\\.socket.*laddr=..0\\.0\\.0\\.0., 0.:pytest.PytestUnraisableExceptionWarning",
+    # Twisted leaves the listening socket open after a failed bind
+    # (CannotListenError): https://github.com/twisted/twisted/issues/6108
+    # The asyncio reactor likewise leaves client sockets and transports open on
+    # teardown. These surface as unraisable exceptions during finalization; the
+    # message wording varies across Python versions (sometimes there is no
+    # "Exception ignored ..." prefix at all), so match on the object repr.
+    "ignore:.*<socket\\.socket fd=:pytest.PytestUnraisableExceptionWarning",
+    "ignore:.*calling deallocator <function (_SelectorTransport|_ProactorBasePipeTransport|_ProactorSocketTransport|BaseEventLoop)\\.__del__:pytest.PytestUnraisableExceptionWarning",
+    # queuelib's test helpers (reused by tests/test_squeues.py) leave queue
+    # files open; the resulting warning surfaces at an arbitrary GC point.
+    "ignore:.*<_io\\.FileIO name=.*queuelib-tests-:pytest.PytestUnraisableExceptionWarning",
+    # pyftpdlib imports the deprecated asyncore/asynchat modules on Python < 3.12.
+    "ignore:The async(ore|hat) module is deprecated:DeprecationWarning",
+    # Old w3lib (min env) compiles a regex with inline flags not at the start.
+    "ignore:Flags not at the start of the expression:DeprecationWarning",
+    # Old Twisted (min env) calls the deprecated threading.currentThread().
+    "ignore:currentThread\\(\\) is deprecated:DeprecationWarning",
 ]
 
 [tool.ruff.lint]
diff --git a/tests/test_command_shell.py b/tests/test_command_shell.py
index f24200f53..5f8ad5a35 100644
--- a/tests/test_command_shell.py
+++ b/tests/test_command_shell.py
@@ -212,6 +212,10 @@ class TestInteractiveShell:
         p.expect_exact("Available Scrapy objects")
         p.sendeof()
         p.wait()  # type: ignore[no-untyped-call]
+        if p.proc.stdin:
+            p.proc.stdin.close()
+        if p.proc.stdout:
+            p.proc.stdout.close()
         logfile.seek(0)
         return logfile.read().decode()
 
@@ -238,6 +242,10 @@ class TestInteractiveShell:
         p.expect_exact("IPYMODULE False")
         p.sendeof()
         p.wait()  # type: ignore[no-untyped-call]
+        if p.proc.stdin:
+            p.proc.stdin.close()
+        if p.proc.stdout:
+            p.proc.stdout.close()
         logfile.seek(0)
         assert "Traceback" not in logfile.read().decode()
 
diff --git a/tests/test_feedexport_storages.py b/tests/test_feedexport_storages.py
index 11e79775f..ef08ea323 100644
--- a/tests/test_feedexport_storages.py
+++ b/tests/test_feedexport_storages.py
@@ -207,16 +207,16 @@ class TestBlockingFeedStorage:
     def test_default_temp_dir(self):
         b = MyBlockingFeedStorage()
 
-        storage_file = b.open(self.get_test_spider())
-        storage_dir = Path(storage_file.name).parent
+        with b.open(self.get_test_spider()) as storage_file:
+            storage_dir = Path(storage_file.name).parent
         assert str(storage_dir) == tempfile.gettempdir()
 
     def test_temp_file(self, tmp_path):
         b = MyBlockingFeedStorage()
 
         spider = self.get_test_spider({"FEED_TEMPDIR": str(tmp_path)})
-        storage_file = b.open(spider)
-        storage_dir = Path(storage_file.name).parent
+        with b.open(spider) as storage_file:
+            storage_dir = Path(storage_file.name).parent
         assert storage_dir == tmp_path
 
     def test_invalid_folder(self, tmp_path):