diff --git a/packages/markitdown/pyproject.toml b/packages/markitdown/pyproject.toml
index 0fe6b35..afb5d31 100644
--- a/packages/markitdown/pyproject.toml
+++ b/packages/markitdown/pyproject.toml
@@ -30,6 +30,7 @@ dependencies = [
   "magika~=0.6.1",
   "charset-normalizer",
   "defusedxml",
+  "onnxruntime<=1.20.1; sys_platform == 'win32'",
 ]
 
 [project.optional-dependencies]