diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 36db6a6..0295ad1 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -12,3 +12,9 @@ repos:
       - id: flake8
         args: ['--ignore=E402,E501,E731,W503']
         files: ^(model_utils|tests)/
+
+  - repo: https://github.com/asottile/pyupgrade
+    rev: v2.37.3
+    hooks:
+    -   id: pyupgrade
+        args: [--py37-plus]
diff --git a/model_utils/managers.py b/model_utils/managers.py
index 19b8d71..75d3d98 100644
--- a/model_utils/managers.py
+++ b/model_utils/managers.py
@@ -139,7 +139,7 @@ class InheritanceQuerySetMixin:
         """
         if not issubclass(model, self.model):
             raise ValueError(
-                "{!r} is not a subclass of {!r}".format(model, self.model))
+                f"{model!r} is not a subclass of {self.model!r}")
 
         ancestry = []
         # should be a OneToOneField or None
@@ -308,7 +308,7 @@ class JoinQueryset(models.QuerySet):
 
         # Put additional quotes around string.
         params = [
-            '\'{}\''.format(p)
+            f'\'{p}\''
             if isinstance(p, str) else p
             for p in params
         ]
@@ -338,7 +338,7 @@ class JoinQueryset(models.QuerySet):
                 if getattr(fk, 'related_model', None) == self.model
             ]
             fk = fk[0] if fk else None
-            model_set = '{}_set'.format(self.model.__name__.lower())
+            model_set = f'{self.model.__name__.lower()}_set'
             key = fk or getattr(qs.model, model_set, None)
 
             if not key:
diff --git a/setup.py b/setup.py
index cdd2c75..73fc09c 100644
--- a/setup.py
+++ b/setup.py
@@ -8,7 +8,7 @@ def long_desc(root_path):
     for filename in FILES:
         filepath = os.path.realpath(os.path.join(root_path, filename))
         if os.path.isfile(filepath):
-            with open(filepath, mode='r') as f:
+            with open(filepath) as f:
                 yield f.read()
 
 
diff --git a/tests/test_managers/test_join_manager.py b/tests/test_managers/test_join_manager.py
index 3b8a4c2..57c1c34 100644
--- a/tests/test_managers/test_join_manager.py
+++ b/tests/test_managers/test_join_manager.py
@@ -6,7 +6,7 @@ from tests.models import BoxJoinModel, JoinItemForeignKey
 class JoinManagerTest(TestCase):
     def setUp(self):
         for i in range(20):
-            BoxJoinModel.objects.create(name='name_{i}'.format(i=i))
+            BoxJoinModel.objects.create(name=f'name_{i}')
 
         JoinItemForeignKey.objects.create(
             weight=10, belonging=BoxJoinModel.objects.get(name='name_1')