diff --git a/CHANGELOG.md b/CHANGELOG.md
index 70cbd10..26aef1c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,14 @@ All notable changes to this project will be documented in this file.
 
 ## Unreleased changes
 
+- Fix some incorrect type signatures.
+  We were mistakenly asking for `django.db.models.Model` instead of `type[django_db.models.Model]` in:
+    - `django_integrity.constraints.foreign_key_constraint_name`
+    - `django_integrity.conversion.Unique`
+    - `django_integrity.conversion.PrimaryKey`
+    - `django_integrity.conversion.NotNull`
+    - `django_integrity.conversion.ForeignKey`
+
 ## v0.1.0 - 2024-05-07
 
 - Initial release! WOO!
diff --git a/src/django_integrity/constraints.py b/src/django_integrity/constraints.py
index b6b467a..97e0b26 100644
--- a/src/django_integrity/constraints.py
+++ b/src/django_integrity/constraints.py
@@ -160,7 +160,7 @@ class NotInTransaction(Exception):
 
 
 def foreign_key_constraint_name(
-    model: django_db.models.Model, field_name: str, *, using: str
+    model: type[django_db.models.Model], field_name: str, *, using: str
 ) -> str:
     """
     Calculate FK constraint name for a model's field.
diff --git a/src/django_integrity/conversion.py b/src/django_integrity/conversion.py
index a0b0174..eb173b7 100644
--- a/src/django_integrity/conversion.py
+++ b/src/django_integrity/conversion.py
@@ -74,7 +74,7 @@ class Unique(_Rule):
     A unique constraint defined by a model and a set of fields.
     """
 
-    model: django_db.models.Model
+    model: type[django_db.models.Model]
     fields: tuple[str]
 
     _pattern = re.compile(r"Key \((?P<fields>.+)\)=\(.*\) already exists.")
@@ -102,7 +102,7 @@ class PrimaryKey(_Rule):
     trying to create a PrimaryKey rule.
     """
 
-    model: django_db.models.Model
+    model: type[django_db.models.Model]
 
     _pattern = re.compile(r"Key \((?P<fields>.+)\)=\(.*\) already exists.")
 
@@ -149,7 +149,7 @@ class NotNull(_Rule):
     A not-null constraint on a Model's field.
     """
 
-    model: django_db.models.Model
+    model: type[django_db.models.Model]
     field: str
 
     def is_match(self, error: django_db.IntegrityError) -> bool:
@@ -168,7 +168,7 @@ class ForeignKey(_Rule):
     A foreign key constraint on a Model's field.
     """
 
-    model: django_db.models.Model
+    model: type[django_db.models.Model]
     field: str
 
     _detail_pattern = re.compile(