diff --git a/docs/requirements.txt b/docs/requirements.txt
index 48c7746..81dafe3 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -139,7 +139,7 @@ tokenize-rt==4.2.1; python_full_version >= "3.6.2" and python_version >= "3.8"
 toml==0.10.2; python_full_version >= "3.7.1" and python_version >= "3.6" and python_version < "4.0"
 tomli==2.0.1
 tomlkit==0.7.0; python_version >= "2.7" and python_full_version < "3.0.0" or python_full_version >= "3.5.0"
-tornado==6.1; python_full_version >= "3.6.1" and python_version >= "3.7"
+tornado==6.4.1; python_full_version >= "3.6.1" and python_version >= "3.7"
 tqdm==4.62.3; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.4.0" and python_version >= "3.6"
 traitlets==5.1.1; python_full_version >= "3.7.1" and python_version >= "3.8" and python_version < "4"
 twine==3.8.0; python_version >= "3.6"