diff --git a/docs/requirements.txt b/docs/requirements.txt
index 86777ec9..8248d33f 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -132,7 +132,7 @@ toml==0.10.2
 
 tox-pipenv==1.10.1
 
-tox==3.26.0; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'
+tox==4.6.0; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'
 
 tqdm==4.64.1; python_version >= '2.6' and python_version not in '3.0, 3.1, 3.2, 3.3'