traces, this project provides its own debug macros,
-  in particular `DEBUGLOG(level, ...)`, defined in `lib/common/debug.h`.
-
-### Code documentation
-* Avoid code documentation that merely repeats what the code is already stating.
-  Whenever applicable, prefer employing the code as the primary way to convey explanations.
-  Example 1 : `int nbTokens = n;` instead of `int i = n; /* i is a nb of tokens *./`.
-  Example 2 : `assert(size > 0);` instead of `/* here, size should be positive */`.
-* At declaration level, the documentation explains how to use the function or variable
-  and when applicable why it's needed, of the scenarios where it can be useful.
-* At implementation level, the documentation explains the general outline of the algorithm employed,
-  and when applicable why this specific choice was preferred.
-
-### General layout
-* 4 spaces for indentation rather than tabs
-* Code documentation shall directly precede function declaration or implementation
-* Function implementations and its code documentation should be preceded and followed by an empty line
-
-
-## License
-By contributing to Zstandard, you agree that your contributions will be licensed
-under both the [LICENSE](LICENSE) file and the [COPYING](COPYING) file in the root directory of this source tree.
diff --git a/sys/contrib/zstd/FREEBSD-Xlist b/sys/contrib/zstd/FREEBSD-Xlist
index f39005add49f..7d87acac5f4a 100644
--- a/sys/contrib/zstd/FREEBSD-Xlist
+++ b/sys/contrib/zstd/FREEBSD-Xlist
@@ -1,10 +1,19 @@
-.circleci
+*/BUCK
+.buckconfig
+.buckversion
 .cirrus.yml
 .github
 .gitignore
 .travis.yml
+CODE_OF_CONDUCT.md
+CONTRIBUTING.md
+Makefile
+Package.swift
+TESTING.md
 build
 contrib
+doc
+examples
 lib/dll
 programs/windres
 tests
diff --git a/sys/contrib/zstd/LICENSE b/sys/contrib/zstd/LICENSE
index a793a8028925..75800288cc24 100644
--- a/sys/contrib/zstd/LICENSE
+++ b/sys/contrib/zstd/LICENSE
@@ -2,7 +2,7 @@ BSD License
 
 For Zstandard software
 
-Copyright (c) 2016-present, Facebook, Inc. All rights reserved.
+Copyright (c) Meta Platforms, Inc. and affiliates. All rights reserved.
 
 Redistribution and use in source and binary forms, with or without modification,
 are permitted provided that the following conditions are met:
@@ -14,9 +14,9 @@ are permitted provided that the following conditions are met:
    this list of conditions and the following disclaimer in the documentation
    and/or other materials provided with the distribution.
 
- * Neither the name Facebook nor the names of its contributors may be used to
-   endorse or promote products derived from this software without specific
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