diff --git a/pyproject.toml b/pyproject.toml
index ad59469da..5c15adbdc 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -11,7 +11,6 @@ dependencies = [
     "wrapt~=1.10",
     "packaging >= 23.1",
     "typing_extensions>=3.10.0.0",
-    "msgpack~=1.0.0; platform_system != 'Windows'",
     "pywin32>=305; platform_system == 'Windows' and platform_python_implementation == 'CPython'",
 ]
 requires-python = ">=3.8"