diff --git a/blockbuster/blockbuster.py b/blockbuster/blockbuster.py
index 957c122..669909c 100644
--- a/blockbuster/blockbuster.py
+++ b/blockbuster/blockbuster.py
@@ -11,7 +11,6 @@
 import os
 import platform
 import sys
-import tempfile
 from contextlib import contextmanager
 from contextvars import ContextVar
 from pathlib import Path
@@ -344,12 +343,13 @@ def _get_os_wrapped_functions(
     )
 
     if platform.python_implementation() != "CPython" or sys.version_info >= (3, 9):
-        functions["os.scandir"] = BlockBusterFunction(
-            type(os.scandir(tempfile.tempdir)),
-            "__next__",
-            scanned_modules=modules,
-            excluded_modules=excluded_modules,
-        )
+        with os.scandir() as scandir_it:
+            functions["os.scandir"] = BlockBusterFunction(
+                type(scandir_it),
+                "__next__",
+                scanned_modules=modules,
+                excluded_modules=excluded_modules,
+            )
 
     for method in (
         "ismount",
diff --git a/pyproject.toml b/pyproject.toml
index ac0fd29..44ee610 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "blockbuster"
-version = "1.5.20"
+version = "1.5.21"
 description = "Utility to detect blocking calls in the async event loop"
 readme = "README.md"
 keywords = ["async", "block", "detect", "event loop", "asyncio"]
diff --git a/uv.lock b/uv.lock
index 17bfbea..d9d6eeb 100644
--- a/uv.lock
+++ b/uv.lock
@@ -16,7 +16,7 @@ wheels = [
 
 [[package]]
 name = "blockbuster"
-version = "1.5.20"
+version = "1.5.21"
 source = { editable = "." }
 dependencies = [
     { name = "forbiddenfruit" },