diff --git a/requirements-dev.txt b/requirements-dev.txt
index e61dd64..13eabb4 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -52,7 +52,7 @@ secretstorage==3.3.1; sys_platform == "linux" and python_version >= "3.7"
 six==1.16.0; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.3.0" and python_version >= "3.6"
 snakeviz==2.1.1
 toml==0.10.2; (python_version >= "2.6" and python_full_version < "3.0.0") or (python_full_version >= "3.3.0")
-tornado==6.1; python_version >= "3.5"
+tornado==6.5.7; python_version >= "3.5"
 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_version >= "3.7"
 twine==3.7.1; python_version >= "3.6"