diff --git a/membershipworks/membershipworks_api.py b/membershipworks/membershipworks_api.py
index 0244336..2097023 100644
--- a/membershipworks/membershipworks_api.py
+++ b/membershipworks/membershipworks_api.py
@@ -174,7 +174,7 @@ class MembershipWorks:
         # get list of member ID matching the search
         # dedup with set() to work around people with alt uids
         # TODO: figure out why people have alt uids
-        return set(user["uid"] for user in r.json()["usr"])
+        return {user["uid"] for user in r.json()["usr"]}
 
     # TODO: has issues with aliasing header names:
     #       ex: "Personal Studio Space" Label vs Membership Addon/Field
diff --git a/membershipworks/tasks/scrape.py b/membershipworks/tasks/scrape.py
index bb01295..03b7a26 100644
--- a/membershipworks/tasks/scrape.py
+++ b/membershipworks/tasks/scrape.py
@@ -80,10 +80,8 @@ def scrape_transactions(membershipworks: MembershipWorks):
     # this is terrible, but as long as the dates are the same, should be fiiiine
     transactions = [{**j, **v} for j, v in zip(transactions_csv, transactions_json)]
     assert all(
-        [
-            t["Account ID"] == t.get("uid", "") and t["Payment ID"] == t.get("sid", "")
-            for t in transactions
-        ]
+        t["Account ID"] == t.get("uid", "") and t["Payment ID"] == t.get("sid", "")
+        for t in transactions
     )
 
     for csv_transaction in transactions:
diff --git a/pyproject.toml b/pyproject.toml
index 4c281ad..8eae21c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -43,7 +43,7 @@ admin_email = "cmsmanage.django_q2_admin_email_reporter:AdminEmailReporter"
 
 [tool.ruff]
 line-length = 88
-select = ["E4", "E7", "E9", "F", "I"]
+select = ["E4", "E7", "E9", "F", "I", "C4"]
 
 [tool.ruff.lint.isort]
 known-first-party = [