diff --git a/pyproject.toml b/pyproject.toml
index bbb64549e5..0150fdc462 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -51,6 +51,7 @@ dependencies = [
     "scipy>=1,<2",
     "numpy>=1.17.0",
     "filelock>=3.15",
+    "libgcc<15 ; platform_system == 'Windows'",
     "etuples",
     "logical-unification",
     "miniKanren",