diff --git python/sites/mach.txt python/sites/mach.txt
index 498e16ebba4f..4023a11d7e9a 100644
--- python/sites/mach.txt
+++ python/sites/mach.txt
@@ -58,15 +58,15 @@ pth:xpcom/geckoprocesstypes_generator
 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==67.1.0:telemetry will not be collected
-pypi-optional:orjson>=3.10:json operations will be slower in various tools
+# pypi-optional:glean-sdk==67.1.0:telemetry will not be collected
+# 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
-vendored-fallback:pyyaml:third_party/python/pyyaml/lib/:faster native loading is disabled
+# pypi-optional:psutil>=5.4.2,<=7.3.0: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:third_party/python/pyyaml/lib/
 vendored:third_party/python/ansicon
 vendored:third_party/python/appdirs
 vendored:third_party/python/async_timeout