diff --git a/lib/licenses.nix b/lib/licenses.nix
index 291c66ea850e..9affe6a2d63c 100644
--- a/lib/licenses.nix
+++ b/lib/licenses.nix
@@ -1212,6 +1212,11 @@ lib.mapAttrs mkLicense ({
     fullName = "TCL/TK License";
   };
 
+  tost = {
+    fullName = "Tomorrow Open Source Technology License 1.0";
+    url = "https://github.com/PixarAnimationStudios/OpenUSD/blob/release/LICENSE.txt";
+  };
+
   ucd = {
     fullName = "Unicode Character Database License";
     url = "https://fedoraproject.org/wiki/Licensing:UCD";
diff --git a/pkgs/development/python-modules/materialx/default.nix b/pkgs/development/python-modules/materialx/default.nix
index 77f857572340..2e7af7b89b1f 100644
--- a/pkgs/development/python-modules/materialx/default.nix
+++ b/pkgs/development/python-modules/materialx/default.nix
@@ -17,13 +17,13 @@
 
 buildPythonPackage rec {
   pname = "materialx";
-  version = "1.39.1";
+  version = "1.38.10";
 
   src = fetchFromGitHub {
     owner = "AcademySoftwareFoundation";
     repo = "MaterialX";
-    rev = "refs/tags/v${version}";
-    hash = "sha256-WzzsY1hOWwJEqT/ZRLIoZDfKNvx1Yf6aFhA3ZcSPx+s=";
+    rev = "v${version}";
+    hash = "sha256-/kMHmW2dptZNtjuhE5s+jvPRIdtY+FRiVtMU+tiBgQo=";
   };
 
   format = "other";
diff --git a/pkgs/development/python-modules/openusd/default.nix b/pkgs/development/python-modules/openusd/default.nix
index b9f88f3b5d51..f44a712aaf80 100644
--- a/pkgs/development/python-modules/openusd/default.nix
+++ b/pkgs/development/python-modules/openusd/default.nix
@@ -52,6 +52,7 @@ in
 buildPythonPackage rec {
   pname = "openusd";
   version = "24.08";
+  pyproject = false;
 
   src = fetchFromGitHub {
     owner = "PixarAnimationStudios";
@@ -65,13 +66,12 @@ buildPythonPackage rec {
 
   outputs = [ "out" ] ++ lib.optional withDocs "doc";
 
-  format = "other";
-
   patches = [
     (fetchpatch {
       name = "port-to-embree-4.patch";
-      url = "https://github.com/PixarAnimationStudios/OpenUSD/pull/2266/commits/4b6c23d459c602fdac5e0ebc9b7722cbd5475e86.patch";
-      hash = "sha256-yjqdGAVqfEsOX1W/tG6c+GgQLYya5U9xgUe/sNIuDbw=";
+      # https://github.com/PixarAnimationStudios/OpenUSD/pull/2266
+      url = "https://github.com/PixarAnimationStudios/OpenUSD/commit/c8fec1342e05dca98a1afd4ea93c7a5f0b41e25b.patch?full_index=1";
+      hash = "sha256-pK1TUwmVv9zsZkOypq25pl+FJDxJJvozUtVP9ystGtI=";
     })
   ];
 
@@ -175,7 +175,10 @@ buildPythonPackage rec {
       for interchange between graphics applications.
     '';
     homepage = "https://openusd.org/";
-    license = lib.licenses.asl20;
-    maintainers = with lib.maintainers; [ shaddydc ];
+    license = lib.licenses.tost;
+    maintainers = with lib.maintainers; [
+      shaddydc
+      gador
+    ];
   };
 }