diff --git a/versions/m-/materialx.json b/versions/m-/materialx.json
index 9641460c4122a7..bf3f1f6da5a7b1 100644
--- a/versions/m-/materialx.json
+++ b/versions/m-/materialx.json
@@ -1,7 +1,7 @@
 {
   "versions": [
     {
-      "git-tree": "0de2cc9b0bbf89ab1a3bcde8fbc25a62f53f00ab",
+      "git-tree": "a401e399f881b616c7767fc13722ef8c6c40fb14",
       "version": "1.39.1",
       "port-version": 2
     },