diff --git a/setup.cfg b/setup.cfg
index e63066f8..240e357f 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -29,7 +29,7 @@ install_requires =
     email_validator>=1.0,<2
     Flask-Babel>=1.0,<3
     Flask-Cors>=3.0,<4
-    Flask-Mail>=0.9,<1
+    Flask-Mail>=0.9.1,<1
     Flask-Migrate>=2.5.3,<4  # Not following semantic versioning (e.g. https://github.com/miguelgrinberg/flask-migrate/commit/1af28ba273de6c88544623b8dc02dd539340294b)
     Flask-RESTful>=0.3.9,<1
     Flask-SQLAlchemy>=2.4,<3