diff --git a/etc/TODO.md b/etc/TODO.md
index 0b0b6bc7547737f9253704ec775b5444c2540b5d..de75116bf38f43aa7a5559a18719412180e5ebb2 100644
--- a/etc/TODO.md
+++ b/etc/TODO.md
@@ -13,3 +13,6 @@
 * https://setuptools.readthedocs.io/en/latest/userguide/dependency_management.html
 * https://setuptools.readthedocs.io/en/latest/userguide/declarative_config.html
 * https://setuptools.readthedocs.io/en/latest/userguide/quickstart.html#basic-use
+
+### Flask-Login
+* https://flask-login.readthedocs.io/en/latest/
diff --git a/requirements.txt b/requirements.txt
index 71aa1c5b0b5f670163acafbfa9d35f5d7a9b4459..bc04804aa746431edb5d5d7522473e1e8ecd38fb 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,6 +4,7 @@ setuptools==52.0.0
 #
 Flask==1.1.2
 SQLAlchemy==1.3.22
+Flask-Login==0.5.0
 #
 # PostgreSQL
 #
diff --git a/setup.cfg b/setup.cfg
index c057207ade8fb77b49e37b45ffa143e56e8be542..fdf4eb6e8b9f3272966befdc2bea855d0ce432ad 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -8,9 +8,10 @@ packages =
   app_worker
 install_requires =
   requests
-  Flask == 1.1.2
-  SQLAlchemy == 1.3.22
-  psycopg2 == 2.8.6
-  wget == 3.2
-  celery[redis] == 5.0.5
+  Flask >= 1.1.2
+  SQLAlchemy >= 1.3.22
+  Flask-Login >= 0.5.0
+  psycopg2 >= 2.8.6
+  wget >= 3.2
+  celery[redis] >= 5.0.5
   importlib; python_version >= "3.7"