diff --git a/pyproject.toml b/pyproject.toml
index 3a941f7e4..df3631040 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -180,7 +180,7 @@ dev-dependencies = [
     "asgi-lifespan>=2.1.0",
     "pytest-github-actions-annotate-failures>=0.2.0",
     "pytest-codspeed>=3.0.0",
-    "blockbuster>=1.3.2,<1.4",
+    "blockbuster>=1.5.0,<1.6",
     "types-aiofiles>=24.1.0.20240626",
 ]
 
diff --git a/src/backend/base/langflow/custom/directory_reader/utils.py b/src/backend/base/langflow/custom/directory_reader/utils.py
index d982252a5..e9c3357ff 100644
--- a/src/backend/base/langflow/custom/directory_reader/utils.py
+++ b/src/backend/base/langflow/custom/directory_reader/utils.py
@@ -1,3 +1,5 @@
+import asyncio
+
 from loguru import logger
 
 from langflow.custom.directory_reader import DirectoryReader
@@ -83,7 +85,7 @@ def build_custom_component_list_from_path(path: str):
 
 async def abuild_custom_component_list_from_path(path: str):
     """Build a list of custom components for the langchain from a given path."""
-    file_list = load_files_from_path(path)
+    file_list = await asyncio.to_thread(load_files_from_path, path)
     reader = DirectoryReader(path, compress_code_field=False)
 
     valid_components, invalid_components = await abuild_and_validate_all_files(reader, file_list)
diff --git a/src/backend/tests/conftest.py b/src/backend/tests/conftest.py
index eefcb9449..0838f2344 100644
--- a/src/backend/tests/conftest.py
+++ b/src/backend/tests/conftest.py
@@ -52,6 +52,9 @@ def blockbuster(request):
                 "io.BufferedWriter.write",
                 "io.TextIOWrapper.read",
                 "io.TextIOWrapper.write",
+                "os.mkdir",
+                "os.stat",
+                "os.path.abspath",
             ]:
                 bb.functions[func].can_block_functions.append(("settings/service.py", {"initialize"}))
             for func in [
@@ -59,6 +62,29 @@ def blockbuster(request):
                 "io.TextIOWrapper.read",
             ]:
                 bb.functions[func].can_block_functions.append(("importlib_metadata/__init__.py", {"metadata"}))
+
+            # TODO: make set_class_code async
+            bb.functions["os.stat"].can_block_functions.append(
+                ("langflow/custom/custom_component/component.py", {"set_class_code"})
+            )
+
+            # TODO: follow discussion in https://github.com/encode/httpx/discussions/3456
+            bb.functions["os.stat"].can_block_functions.append(("httpx/_client.py", {"_init_transport"}))
+
+            bb.functions["os.stat"].can_block_functions.append(("linecache.py", {"checkcache", "updatecache"}))
+            bb.functions["os.stat"].can_block_functions.append(("rich/traceback.py", {"_render_stack"}))
+            bb.functions["os.stat"].can_block_functions.append(
+                ("langchain_core/_api/internal.py", {"is_caller_internal"})
+            )
+            bb.functions["os.path.abspath"].can_block_functions.extend(
+                [
+                    ("loguru/_better_exceptions.py", {"_get_lib_dirs", "_format_exception"}),
+                    ("sqlalchemy/dialects/sqlite/pysqlite.py", {"create_connect_args"}),
+                    ("_pytest/assertion/rewrite.py", {"_should_rewrite"}),
+                ]
+            )
+            bb.functions["os.mkdir"].can_block_functions.append(("_pytest/assertion/rewrite.py", {"try_makedirs"}))
+            bb.functions["os.replace"].can_block_functions.append(("_pytest/assertion/rewrite.py", {"_write_pyc"}))
             yield bb
 
 
diff --git a/src/backend/tests/unit/test_webhook.py b/src/backend/tests/unit/test_webhook.py
index c8d5a3ab0..dd75a3370 100644
--- a/src/backend/tests/unit/test_webhook.py
+++ b/src/backend/tests/unit/test_webhook.py
@@ -1,5 +1,4 @@
-import tempfile
-
+import aiofiles
 import anyio
 import pytest
 
@@ -17,7 +16,7 @@ async def test_webhook_endpoint(client, added_webhook_test):
     endpoint_name = added_webhook_test["endpoint_name"]
     endpoint = f"api/v1/webhook/{endpoint_name}"
     # Create a temporary file
-    with tempfile.TemporaryDirectory() as tmp:
+    async with aiofiles.tempfile.TemporaryDirectory() as tmp:
         file_path = anyio.Path(tmp) / "test_file.txt"
 
         payload = {"path": str(file_path)}
diff --git a/uv.lock b/uv.lock
index a088b01e0..1f933b928 100644
--- a/uv.lock
+++ b/uv.lock
@@ -520,14 +520,14 @@ wheels = [
 
 [[package]]
 name = "blockbuster"
-version = "1.3.2"
+version = "1.5.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "forbiddenfruit" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/e4/0b/e61888f0510374e2fc3c86f8edff5f56c28b896c080af7732ed3e6b2f205/blockbuster-1.3.2.tar.gz", hash = "sha256:196a5f8fef3f22c718fd8e547dafc75a1936b87ff2b5a1f73ea233b00cff0d6a", size = 9463 }
+sdist = { url = "https://files.pythonhosted.org/packages/f1/5d/1999e1a4a204b7a0b72662b8b1390a162b32a601f9a7fbe7549f1e77b3fe/blockbuster-1.5.0.tar.gz", hash = "sha256:f647638413f99fc6a6e47923ce3fa7ff3b9c078b458ed00e6131941db5540fac", size = 10431 }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/9a/c1/745a22df92431b878be1949015164c228a523f97d978ea7f2c7e277e2fc8/blockbuster-1.3.2-py3-none-any.whl", hash = "sha256:57fd9fcc51933cb421400f2b2c708c6fee22269a8691a10a9dbfb671638cfdc7", size = 8153 },
+    { url = "https://files.pythonhosted.org/packages/7e/06/c9103025eb2e58a2853fbea4be184db4342c37510b09131af9d7b1218e3f/blockbuster-1.5.0-py3-none-any.whl", hash = "sha256:24c2923980a17fe4231b16942d45a117278b8939eeeba64dec3e7b92a91867c6", size = 8475 },
 ]
 
 [[package]]
@@ -4015,7 +4015,7 @@ requires-dist = [
 [package.metadata.requires-dev]
 dev = [
     { name = "asgi-lifespan", specifier = ">=2.1.0" },
-    { name = "blockbuster", specifier = ">=1.3.2,<1.4" },
+    { name = "blockbuster", specifier = ">=1.5.0,<1.6" },
     { name = "dictdiffer", specifier = ">=0.9.0" },
     { name = "httpx", specifier = ">=0.27.0" },
     { name = "ipykernel", specifier = ">=6.29.0" },