diff --git a/setup.cfg b/setup.cfg
index 85a8c279..e4fd9f71 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -23,24 +23,24 @@ packages = find:
 include_package_data = True
 zip_safe = False
 install_requires =
-    blinker~=1.4
-    cachetools~=4.1
-    debts~=0.5
-    email_validator~=1.0
-    Flask-Babel>=1,<3
-    Flask-Cors~=3.0
-    Flask-Mail~=0.9
+    blinker>=1.4,<2
+    cachetools>=4.1,<5
+    debts>=0.5,<1
+    email_validator>=1.0,<2
+    Flask-Babel>=1.0,<3
+    Flask-Cors>=3.0,<4
+    Flask-Mail>=0.9,<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,>=0.3.9
-    Flask-SQLAlchemy~=2.4
-    Flask-WTF~=0.14,>=0.14.3  # See b76da172652da94c1f9c4b2fdd965375da8a2c3f
+    Flask-RESTful>=0.3.9,<1
+    Flask-SQLAlchemy>=2.4,<3
+    Flask-WTF>=0.14.3,<1
     WTForms>=2.3.1,<2.4
-    Flask>=2.0,<3.0
-    itsdangerous>=2.0,<3.0
-    Jinja2>=3.0,<4.0
-    requests~=2.22
-    SQLAlchemy-Continuum~=1.3,>=1.3.9
-    SQLAlchemy~=1.3.0  # New 1.4 changes API, see #728
+    Flask>=2,<3
+    itsdangerous>=2,<3
+    Jinja2>=3,<4
+    requests>=2.22,<3
+    SQLAlchemy-Continuum>=1.3.9,<2
+    SQLAlchemy>=1.3.0,<1.4  # New 1.4 changes API, see #728
 
 [options.extras_require]
 dev =
@@ -51,7 +51,7 @@ dev =
     pytest>=5.4.1
     tox>=3.14.6
     zest.releaser>=6.20.1
-    psycopg2-binary~=2.9
+    psycopg2-binary>=2.9,<3
     PyMySQL>=0.9,<1.1
 
 doc =