--- python/sites/mach.txt.orig	2026-08-25 22:54:55 UTC
+++ python/sites/mach.txt
@@ -59,13 +59,14 @@ pth:xpcom/idl-parser
 # glean-sdk may not be installable if a wheel isn't available
 # and it has to be built from source.
 # pypi-optional:glean-sdk==68.0.1:telemetry will not be collected
-pypi-optional:orjson>=3.10:json operations will be slower in various tools
+# pypi-optional:orjson>=3.10:json operations will be slower in various tools
 # Mach gracefully handles the case where `psutil` is unavailable.
 # We aren't (yet) able to pin packages in automation, so we have to
 # support down to the oldest locally-installed version (5.4.2).
-pypi-optional:psutil>=5.4.2:telemetry will be missing some data
-pypi-optional:rtoml>=0.11.0:toml operations will be slower in various tools
-pypi-optional:zstandard>=0.11.1,<=0.25.0:zstd archives will not be possible to extract
+# pypi-optional:psutil>=5.4.2:telemetry will be missing some data
+# pypi-optional:rtoml>=0.11.0:toml operations will be slower in various tools
+# pypi-optional:zstandard>=0.11.1,<=0.25.0:zstd archives will not be possible to extract
+vendored:pyyaml:third_party/python/pyyaml/lib/
 vendored-fallback:pyyaml:third_party/python/pyyaml/lib/:faster native loading is disabled
 vendored:third_party/python/ansicon
 vendored:third_party/python/appdirs