diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 07722d9c8de1c..505a4a1ba60f8 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -654,7 +654,7 @@ tox -e <environment>
 For example,
 
 ```bash
-tox -e py36
+tox -e py38
 ```
 
 Alternatively, you can run all tests in a single file via,