diff --git a/COPYRIGHT.txt b/COPYRIGHT.txt
index fe046863fcd..0cbbbc7dec0 100644
--- a/COPYRIGHT.txt
+++ b/COPYRIGHT.txt
@@ -325,7 +325,7 @@ License: Apache-2.0
 
 Files: ./thirdparty/meshoptimizer/
 Comment: meshoptimizer
-Copyright: 2016-2022, Arseny Kapoulkine
+Copyright: 2016-2023, Arseny Kapoulkine
 License: Expat
 
 Files: ./thirdparty/minimp3/
diff --git a/thirdparty/README.md b/thirdparty/README.md
index be0693bc34e..edf143cad2d 100644
--- a/thirdparty/README.md
+++ b/thirdparty/README.md
@@ -501,7 +501,7 @@ File extracted from upstream release tarball:
 ## meshoptimizer
 
 - Upstream: https://github.com/zeux/meshoptimizer
-- Version: git (4a287848fd664ae1c3fc8e5e008560534ceeb526, 2022)
+- Version: git (c21d3be6ddf627f8ca852ba4b6db9903b0557858, 2023)
 - License: MIT
 
 Files extracted from upstream repository:
@@ -509,10 +509,8 @@ Files extracted from upstream repository:
 - All files in `src/`
 - `LICENSE.md`
 
-An [experimental upstream feature](https://github.com/zeux/meshoptimizer/tree/simplify-attr),
-has been backported. On top of that, it was modified to report only distance
-error metrics instead of a combination of distance and attribute errors. Patches
-for both changes can be found in the `patches` directory.
+A patch is included to modify the simplifier to report only distance error
+metrics instead of a combination of distance and attribute errors.
 
 
 ## minimp3
diff --git a/thirdparty/meshoptimizer/LICENSE.md b/thirdparty/meshoptimizer/LICENSE.md
index b673c248b22..962ed41ffbe 100644
--- a/thirdparty/meshoptimizer/LICENSE.md
+++ b/thirdparty/meshoptimizer/LICENSE.md
@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2016-2022 Arseny Kapoulkine
+Copyright (c) 2016-2023 Arseny Kapoulkine
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal