diff --git a/openbb_platform/core/openbb/assets/reference.json b/openbb_platform/core/openbb/assets/reference.json
index 885a9f88f5b..0a607df4569 100644
--- a/openbb_platform/core/openbb/assets/reference.json
+++ b/openbb_platform/core/openbb/assets/reference.json
@@ -1,9 +1,9 @@
 {
-    "openbb": "1.5.1core",
+    "openbb": "1.5.2core",
     "info": {
         "title": "OpenBB Platform (Python)",
         "description": "Investment research for everyone, anywhere.",
-        "core": "1.5.1",
+        "core": "1.5.2",
         "extensions": {
             "openbb_core_extension": [],
             "openbb_provider_extension": [],
diff --git a/openbb_platform/core/openbb_core/app/static/package_builder.py b/openbb_platform/core/openbb_core/app/static/package_builder.py
index 235b6676b9a..e3ce281bb63 100644
--- a/openbb_platform/core/openbb_core/app/static/package_builder.py
+++ b/openbb_platform/core/openbb_core/app/static/package_builder.py
@@ -2,7 +2,7 @@
 
 # pylint: disable=too-many-lines,too-many-locals,too-many-nested-blocks,too-many-statements,too-many-branches,too-many-positional-arguments
 import builtins
-import fcntl
+import contextlib
 import inspect
 import os
 import re
@@ -59,6 +59,14 @@ try:
 except ImportError:
     CHARTING_INSTALLED = False
 
+try:
+    import fcntl  # type: ignore
+
+    _HAS_FCNTL = True
+except Exception:  # pylint: disable=broad-except  # noqa
+    _HAS_FCNTL = False
+    import msvcrt  # pylint: disable=unused-import  # noqa
+
 DataProcessingSupportedTypes = TypeVar(
     "DataProcessingSupportedTypes",
     list,
@@ -79,6 +87,45 @@ def create_indent(n: int) -> str:
     return TAB * n
 
 
+class FileLock:
+    """Simple cross-platform file lock wrapper used only for this module."""
+
+    def __init__(self, file_obj):
+        """Initialize the file lock."""
+        self._file = file_obj
+
+    def acquire(self, blocking: bool = True) -> None:
+        """Acquire the file lock."""
+        if _HAS_FCNTL:
+            flags = fcntl.LOCK_EX | (0 if blocking else fcntl.LOCK_NB)
+            fcntl.flock(self._file.fileno(), flags)
+        else:  # Windows via msvcrt
+
+            mode = msvcrt.LK_LOCK if blocking else msvcrt.LK_NBLCK  # type: ignore # pylint: disable=E0601
+            try:
+                # lock 1 byte at file start; file.seek(0) to ensure position
+                self._file.seek(0)
+                msvcrt.locking(self._file.fileno(), mode, 1)  # type: ignore
+            except OSError as exc:  # pragma: no cover - platform specific
+                # Normalize to BlockingIOError for parity with fcntl non-blocking
+                raise BlockingIOError from exc
+
+    def release(self) -> None:
+        """Release the file lock."""
+        try:
+            if _HAS_FCNTL:
+                fcntl.flock(self._file.fileno(), fcntl.LOCK_UN)
+            else:
+                try:
+                    self._file.seek(0)
+                    msvcrt.locking(self._file.fileno(), msvcrt.LK_UNLCK, 1)  # type: ignore
+                except OSError:
+                    # If unlocking fails on Windows, ignore - file will be closed soon
+                    pass
+        except Exception:  # pylint: disable=broad-except  # noqa
+            pass
+
+
 class PackageBuilder:
     """Build the extension package for the Platform."""
 
@@ -123,12 +170,14 @@ class PackageBuilder:
 
         # Open lock file and acquire exclusive lock
         with open(self._lock_path, "w", encoding="utf-8") as lock_file:
+            file_lock = FileLock(lock_file)
             try:
                 # Get exclusive lock on file
-                fcntl.flock(lock_file.fileno(), fcntl.LOCK_EX | fcntl.LOCK_NB)
+                file_lock.acquire(blocking=False)
 
                 # Write PID to lock file for debugging
                 lock_file.seek(0)
+                lock_file.truncate()
                 lock_file.write(str(os.getpid()))
                 lock_file.flush()
 
@@ -141,14 +190,14 @@ class PackageBuilder:
                 self._save_reference_file(ext_map)
                 if self.lint:
                     self._run_linters()
-
             except BlockingIOError:
                 raise RuntimeError(  # noqa # pylint: disable=W0707
                     f"Another build process is running and has locked {self._lock_path}"
                 )
             finally:
-                # Release lock
-                fcntl.flock(lock_file.fileno(), fcntl.LOCK_UN)
+                # Release the file lock, suppressing any exceptions during cleanup
+                with contextlib.suppress(Exception):
+                    file_lock.release()
 
     def _clean(self, modules: str | list[str] | None = None) -> None:
         """Delete the assets and package folder or modules before building."""
diff --git a/openbb_platform/core/pyproject.toml b/openbb_platform/core/pyproject.toml
index 0551ed6ad20..4744f39c008 100644
--- a/openbb_platform/core/pyproject.toml
+++ b/openbb_platform/core/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "openbb-core"
-version = "1.5.1"
+version = "1.5.2"
 description = "OpenBB package with core functionality."
 authors = ["OpenBB Team <hello@openbb.co>"]
 license = "AGPL-3.0-only"
diff --git a/openbb_platform/core/tests/app/static/test_reference_loader.py b/openbb_platform/core/tests/app/static/test_reference_loader.py
index 9c8b0041007..9a0f6661178 100644
--- a/openbb_platform/core/tests/app/static/test_reference_loader.py
+++ b/openbb_platform/core/tests/app/static/test_reference_loader.py
@@ -26,7 +26,7 @@ def mock_reference_data(tmp_path):
     mock_data = {"key": "value"}
     with open(reference_file, "w", encoding="utf-8") as f:
         json.dump(mock_data, f)
-    return directory
+    return tmp_path
 
 
 def test_load_reference_data(mock_reference_data, reference_loader):
diff --git a/openbb_platform/poetry.lock b/openbb_platform/poetry.lock
index 6200c18c5ec..5bd0f89e426 100644
--- a/openbb_platform/poetry.lock
+++ b/openbb_platform/poetry.lock
@@ -3070,14 +3070,14 @@ openbb-core = ">=1.5.1,<2.0.0"
 
 [[package]]
 name = "openbb-core"
-version = "1.5.1"
+version = "1.5.2"
 description = "OpenBB package with core functionality."
 optional = false
-python-versions = "<3.14,>=3.9.21"
+python-versions = "<3.14,>=3.10"
 groups = ["main"]
 files = [
-    {file = "openbb_core-1.5.1-py3-none-any.whl", hash = "sha256:5ebd221f82c57dd15a84bc3787965df335604b26bfe71338b5d099ebf5cdfcf2"},
-    {file = "openbb_core-1.5.1.tar.gz", hash = "sha256:57a424fdc0ae9eb10b855c77dc63e0bafdad4f981120b452e15cd973fedf25a2"},
+    {file = "openbb_core-1.5.2-py3-none-any.whl", hash = "sha256:a3f1be561a5f6c87b8160f44293fc05f9308e365b0d76a744b6c18154d7c7473"},
+    {file = "openbb_core-1.5.2.tar.gz", hash = "sha256:6017407025dd4f1ee326c0e99421267f6254efe83fc10099ba63241203d56153"},
 ]
 
 [package.dependencies]
@@ -6178,4 +6178,4 @@ wsj = ["openbb-wsj"]
 [metadata]
 lock-version = "2.1"
 python-versions = ">=3.10,<3.14"
-content-hash = "ef984b27041496f4caabe2c31ed3ef94a42afa9bb05531872377aedd0fc8333e"
+content-hash = "74aa34922fd5b5dde0b10df4e402878ea12dcb56bb549ea105768d47afff8309"
diff --git a/openbb_platform/pyproject.toml b/openbb_platform/pyproject.toml
index 87e2fe968da..04feae514cf 100644
--- a/openbb_platform/pyproject.toml
+++ b/openbb_platform/pyproject.toml
@@ -10,7 +10,7 @@ packages = [{ include = "openbb", from = "core" }]
 
 [tool.poetry.dependencies]
 python = ">=3.10,<3.14"
-openbb-core = "^1.5.1"
+openbb-core = "^1.5.2"
 openbb-platform-api = "^1.2.1"
 
 openbb-benzinga = "^1.5.0"