diff --git a/unix/dev-requirements.txt b/unix/dev-requirements.txt
index 5add982..1e265de 100644
--- a/unix/dev-requirements.txt
+++ b/unix/dev-requirements.txt
@@ -59,7 +59,7 @@ toml==0.10.2; python_version >= '2.6' and python_version not in '3.0, 3.1, 3.2,
 tqdm==4.61.1; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'
 twine==3.4.1
 typed-ast==1.5.2
-typing-extensions==4.0.1
+typing-extensions==4.2.0
 urllib3==1.26.5; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4' and python_version < '4'
 webencodings==0.5.1
 wheel==0.36.2