diff --git a/lms/services/digest.py b/lms/services/digest.py
index 60761822f9..1a386f07cf 100644
--- a/lms/services/digest.py
+++ b/lms/services/digest.py
@@ -235,10 +235,10 @@ def instructor_digest(self, h_userid):
                         "title": assignment_info.title,
                         "num_annotations": len(assignment_learner_annotations),
                         "annotators": list(
-                            set(
+                            {
                                 annotation.userid
                                 for annotation in assignment_learner_annotations
-                            )
+                            }
                         ),
                     }
                 )
@@ -248,10 +248,10 @@ def instructor_digest(self, h_userid):
                     "title": course_info.title,
                     "num_annotations": num_annotations,
                     "annotators": list(
-                        set(
+                        {
                             annotation.userid
                             for annotation in course_info.learner_annotations
-                        )
+                        }
                     ),
                     "assignments": course_assignments,
                 }
@@ -262,11 +262,11 @@ def instructor_digest(self, h_userid):
                 course_digest["num_annotations"] for course_digest in course_digests
             ),
             "annotators": list(
-                set(
+                {
                     annotator
                     for course_digest in course_digests
                     for annotator in course_digest["annotators"]
-                )
+                }
             ),
             "courses": course_digests,
         }
@@ -346,9 +346,9 @@ def course_infos(self):
         if self._course_infos is not None:
             return self._course_infos
 
-        authority_provided_ids = set(
+        authority_provided_ids = {
             annotation.authority_provided_id for annotation in self.annotations
-        )
+        }
 
         # We're going to be joining the grouping table to itself and this requires
         # us to create an alias for one side of the join, see:
diff --git a/lms/views/api/canvas/authorize.py b/lms/views/api/canvas/authorize.py
index 989b58dcc0..6b52aeee54 100644
--- a/lms/views/api/canvas/authorize.py
+++ b/lms/views/api/canvas/authorize.py
@@ -48,7 +48,7 @@
 }
 
 # All the scopes that our LMS app may use.
-ALL_SCOPES = set(scope for scopes in SCOPES.values() for scope in scopes)
+ALL_SCOPES = {scope for scopes in SCOPES.values() for scope in scopes}
 
 
 @view_config(
diff --git a/pyproject.toml b/pyproject.toml
index 64ce55f634..40c0de1432 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -91,7 +91,6 @@ ignore = [
     "RET504",
     "RET501",
     "PLR6301",
-    "C401",
     "E721",
 ]