diff --git a/requirements_ref.txt b/requirements_ref.txt
index cff1fd8..2f294b0 100644
--- a/requirements_ref.txt
+++ b/requirements_ref.txt
@@ -39,7 +39,7 @@ requests==2.23.0          # via connexion
 six==1.14.0               # via flask-cors, jsonschema, openapi-spec-validator, pip-tools, pyrsistent, python-dateutil
 sqlalchemy==1.3.16        # via alembic, flask-sqlalchemy
 swagger-ui-bundle==0.0.6  # via connexion
-urllib3==1.25.9           # via requests
+urllib3==1.26.5           # via requests
 werkzeug==1.0.1           # via -r etc/requirements.in, flask
 wget==3.2                 # via -r etc/requirements.in
 zipp==3.1.0               # via importlib-metadata