diff --git a/setup.cfg b/setup.cfg
index e450c8e1..85a8c279 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -31,22 +31,22 @@ install_requires =
     Flask-Cors~=3.0
     Flask-Mail~=0.9
     Flask-Migrate>=2.5.3,<4  # Not following semantic versioning (e.g. https://github.com/miguelgrinberg/flask-migrate/commit/1af28ba273de6c88544623b8dc02dd539340294b)
-    Flask-RESTful~=0.3
+    Flask-RESTful~=0.3,>=0.3.9
     Flask-SQLAlchemy~=2.4
     Flask-WTF~=0.14,>=0.14.3  # See b76da172652da94c1f9c4b2fdd965375da8a2c3f
     WTForms>=2.3.1,<2.4
-    Flask>=1.1,<3.0
-    itsdangerous>=1.1,<3.0
+    Flask>=2.0,<3.0
+    itsdangerous>=2.0,<3.0
     Jinja2>=3.0,<4.0
     requests~=2.22
-    SQLAlchemy-Continuum~=1.3
+    SQLAlchemy-Continuum~=1.3,>=1.3.9
     SQLAlchemy~=1.3.0  # New 1.4 changes API, see #728
 
 [options.extras_require]
 dev =
     black>=19.10b0 ; python_version >= '3.6'
     flake8>=3.7.9
-    Flask-Testing>=0.8.0
+    Flask-Testing>=0.8.1
     isort>=5.0.0
     pytest>=5.4.1
     tox>=3.14.6