diff --git a/ruff.toml b/ruff.toml
index 656ca04..36efea0 100644
--- a/ruff.toml
+++ b/ruff.toml
@@ -27,12 +27,9 @@ lint.extend-ignore = [
     "E712", # ...
     "E713", # Test for membership should be `not in`
     "PLR2044", # Line with empty comment
-    "RUF027", # Possible f-string without an `f` prefix
     "S101", # Use of `assert` detected
     "S320", # OK, we're using defusedxml
-#    "TCH001", # Move import into a type-checking block
-#    "TCH002", # Move import into a type-checking block
-#    "TCH003", # Move import into a type-checking block
+    "ISC001", # Conflicts with formatter
 
     # Fix these (if possible / reasonable)
     "A001", # Variable `...` is shadowing a python builtin
@@ -101,6 +98,7 @@ lint.extend-ignore = [
     "RET505", # Unnecessary `else` after `return` statement
     "RUF005", # Consider iterable unpacking instead of concatenation
     "RUF012", # Mutable class attributes should be annotated with `typing.ClassVar`
+    #
     "S104", # Possible binding to all interfaces
     "S301", # `pickle`...
     "S403", # `pickle`, `cPickle`, `dill`, and `shelve` modules are possibly insecure
@@ -111,13 +109,13 @@ lint.extend-ignore = [
     "S606", # Subprocess related...
     "S607", # Subprocess related...
     "S701", # By default, jinja2 sets `autoescape` to `False`.
+    #
     "SIM102", # Use a single `if` statement instead of nested `if` statements
     "SIM108", # Use ternary operator
     "SIM115", # Use context handler for opening files
     "SIM117", # Use a single `with` statement with multiple contexts instead of nested `with` statements
     "SLF001", # Private member accessed
     "T201", # `print` found
-    "UP032", # Use f-strings
 ]
 
 [lint.mccabe]
diff --git a/setup.cfg b/setup.cfg
index 6f3308d..7fc9c05 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -44,6 +44,8 @@ ignore =
   F841
   # ambiguous variable name
   E741
+  # Line too long
+  E501
   # abstract base class, but it has no abstract methods
   B024
   # something something abstract class
diff --git a/src/abilian/core/models/attachment.py b/src/abilian/core/models/attachment.py
index b5c0c09..acbc94b 100644
--- a/src/abilian/core/models/attachment.py
+++ b/src/abilian/core/models/attachment.py
@@ -102,9 +102,7 @@ def __repr__(self) -> str:
         class_ = self.__class__
         mod_ = class_.__module__
         classname = class_.__name__
-        return "<{}.{} instance at 0x{:x} entity id={!r}>".format(
-            mod_, classname, id(self), self.entity_id
-        )
+        return f"<{mod_}.{classname} instance at 0x{id(self):x} entity id={self.entity_id!r}>"
 
 
 @sa.event.listens_for(Attachment, "before_insert", propagate=True)
diff --git a/src/abilian/core/models/subjects.py b/src/abilian/core/models/subjects.py
index 4c1e182..8dc56f8 100644
--- a/src/abilian/core/models/subjects.py
+++ b/src/abilian/core/models/subjects.py
@@ -293,13 +293,7 @@ def __str__(self) -> str:
 
     def __repr__(self) -> str:
         cls = self.__class__
-        return "<{mod}.{cls} id={id!r} email={email!r} at 0x{addr:x}>".format(
-            mod=cls.__module__,
-            cls=cls.__name__,
-            id=self.id,
-            email=self.email,
-            addr=id(self),
-        )
+        return f"<{cls.__module__}.{cls.__name__} id={self.id!r} email={self.email!r} at 0x{id(self):x}>"
 
 
 @listens_for(User, "mapper_configured", propagate=True)
diff --git a/src/abilian/sbe/apps/documents/models.py b/src/abilian/sbe/apps/documents/models.py
index e02693f..6e2e59f 100644
--- a/src/abilian/sbe/apps/documents/models.py
+++ b/src/abilian/sbe/apps/documents/models.py
@@ -670,9 +670,7 @@ def file_name(self) -> str:
         return self.title
 
     def __repr__(self) -> str:
-        return "<Document id={!r} name={!r} path={!r} content_length={:d} at 0x{:x}>".format(
-            self.id, self.title, self.path, self.content_length, id(self)
-        )
+        return f"<Document id={self.id!r} name={self.title!r} path={self.path!r} content_length={self.content_length:d} at 0x{id(self):x}>"
 
     # locking management; used for checkin/checkout - this could be generalized to
     # any entity
diff --git a/src/abilian/sbe/apps/documents/views/documents.py b/src/abilian/sbe/apps/documents/views/documents.py
index ac2d171..80abc04 100644
--- a/src/abilian/sbe/apps/documents/views/documents.py
+++ b/src/abilian/sbe/apps/documents/views/documents.py
@@ -198,8 +198,8 @@ def document_download(doc_id: int, attach: bool = False) -> Response:
     ):
         # Note: we omit text/html for security reasons.
         quoted_filename = quote(doc.title.encode("utf8"))
-        response.headers["content-disposition"] = 'attachment;filename="{}"'.format(
-            quoted_filename
+        response.headers["content-disposition"] = (
+            f'attachment;filename="{quoted_filename}"'
         )
 
     return response
diff --git a/src/abilian/sbe/apps/social/views/users.py b/src/abilian/sbe/apps/social/views/users.py
index ec2b2fd..3e9cf25 100644
--- a/src/abilian/sbe/apps/social/views/users.py
+++ b/src/abilian/sbe/apps/social/views/users.py
@@ -123,8 +123,8 @@ def users_dt_json():
         name = escape(user.name or "")
 
         cell0 = (
-            '<a href="{url}"><img src="{src}" width="{size}" height="{size}">'
-            "</a>".format(url=user_url, src=mugshot, size=MUGSHOT_SIZE)
+            f'<a href="{user_url}"><img src="{mugshot}" width="{MUGSHOT_SIZE}" height="{MUGSHOT_SIZE}">'
+            "</a>"
         )
         cell1 = f'<div class="info"><a href="{user_url}">{name}</a></div>'
         cell2 = age(user.created_at)
diff --git a/src/abilian/services/audit/service.py b/src/abilian/services/audit/service.py
index 965f1a0..385e44c 100644
--- a/src/abilian/services/audit/service.py
+++ b/src/abilian/services/audit/service.py
@@ -174,11 +174,9 @@ def setup_auditable_entity(self, entity_class: Any):
                 backref_attr = ".".join(inferred_backref)
             else:
                 raise ValueError(
-                    "Audit setup class<{cls}: Could not guess backref name"
-                    ' of relationship "{related_attr}", please use tuple annotation '
-                    "on __auditable_entity__".format(
-                        cls=entity_class.__name__, related_attr=related_attr
-                    )
+                    f"Audit setup class<{entity_class.__name__}: Could not guess backref name"
+                    f' of relationship "{related_attr}", please use tuple annotation '
+                    "on __auditable_entity__"
                 )
 
         meta.related = related_path
diff --git a/src/abilian/web/action.py b/src/abilian/web/action.py
index 65c2a15..01787f2 100644
--- a/src/abilian/web/action.py
+++ b/src/abilian/web/action.py
@@ -236,12 +236,7 @@ def __str__(self) -> str:
         return str(url_for(self.name, **self.get_kwargs()))
 
     def __repr__(self) -> str:
-        return "{cls}({name!r}, *{args!r}, **{kwargs!r})".format(
-            cls=self.__class__.__name__,
-            name=self.name,
-            args=self.args,
-            kwargs=self.kwargs,
-        )
+        return f"{self.__class__.__name__}({self.name!r}, *{self.args!r}, **{self.kwargs!r})"
 
 
 class Action:
diff --git a/src/abilian/web/admin/panels/users/views.py b/src/abilian/web/admin/panels/users/views.py
index e114362..446bcd9 100644
--- a/src/abilian/web/admin/panels/users/views.py
+++ b/src/abilian/web/admin/panels/users/views.py
@@ -89,9 +89,7 @@ def data(self, *args, **kw) -> dict:
                 r for r in security.get_roles(user, no_group_roles=True) if r.assignable
             ]
             columns = [
-                '<a href="{url}"><img src="{src}" width="{size}" height="{size}"></a>'.format(
-                    url=user_url, src=mugshot, size=MUGSHOT_SIZE
-                ),
+                f'<a href="{user_url}"><img src="{mugshot}" width="{MUGSHOT_SIZE}" height="{MUGSHOT_SIZE}"></a>',
                 f'<a href="{user_url}">{name}</a>',
                 f'<a href="{user_url}"><em>{email}</em></a>',
                 "\u2713" if user.can_login else "",
diff --git a/src/abilian/web/forms/form.py b/src/abilian/web/forms/form.py
index 975ee9b..78b1560 100644
--- a/src/abilian/web/forms/form.py
+++ b/src/abilian/web/forms/form.py
@@ -204,9 +204,7 @@ def _core_field_repr(self) -> str:
 
         Useful for tracing field errors (like in Sentry).
         """
-        return "<{}.{} at 0x{:x} name={!r}>".format(
-            self.__class__.__module__, self.__class__.__name__, id(self), self.name
-        )
+        return f"<{self.__class__.__module__}.{self.__class__.__name__} at 0x{id(self):x} name={self.name!r}>"
 
     patch_logger.info(f"{Field.__module__}.Field.__repr__")
     Field.__repr__ = _core_field_repr