diff --git a/pytest.ini b/pytest.ini
index 69d95b26..ee857458 100644
--- a/pytest.ini
+++ b/pytest.ini
@@ -2,6 +2,7 @@
 norecursedirs=dist build .tox .eggs
 addopts=--doctest-modules
 filterwarnings=
+	## upstream
 	# Ensure ResourceWarnings are emitted
 	default::ResourceWarning
 
@@ -23,3 +24,8 @@ filterwarnings=
 
 	# realpython/pytest-mypy#152
 	ignore:'encoding' argument not specified::pytest_mypy
+
+	# python/cpython#100750
+	ignore::EncodingWarning:platform
+
+	## end upstream