diff --git a/contracting_process/field_level/definitions.py b/contracting_process/field_level/definitions.py
index 5ed43a2..3f67ba5 100644
--- a/contracting_process/field_level/definitions.py
+++ b/contracting_process/field_level/definitions.py
@@ -52,7 +52,7 @@ def _definitions(properties, path=None, refs=None):
             elif refs[-1] == "ContactPoint":
                 if key == "email":
                     checks.append((email.calculate, email.name))
-                elif key in ("faxNumber", "telephone"):
+                elif key in {"faxNumber", "telephone"}:
                     checks.append((telephone.calculate, telephone.name))
             elif refs[-1] == "Document":
                 if key == "description":
@@ -82,7 +82,7 @@ def _definitions(properties, path=None, refs=None):
                 if key == "numberOfTenderers":
                     checks.append((number.calculate, number.name))
             elif refs[-1] == "Value":  # noqa: SIM102 # consistency
-                if key == "amount" and new_path[-3] in ("transactions", "unit"):
+                if key == "amount" and new_path[-3] in {"transactions", "unit"}:
                     checks.append((number.calculate, number.name))
 
             yield dot_path, checks
diff --git a/contracting_process/resource_level/consistent/contracts_value.py b/contracting_process/resource_level/consistent/contracts_value.py
index e518351..3e12903 100644
--- a/contracting_process/resource_level/consistent/contracts_value.py
+++ b/contracting_process/resource_level/consistent/contracts_value.py
@@ -71,7 +71,7 @@ def calculate(item):
 
         award_amount = get_amount(no_conversion, unconverted_amount, currency, date)
         # (2,5) Amount is zero or unconvertable.
-        if award_amount in (0, None):
+        if award_amount in {0, None}:
             continue
 
         contracts_amount_sum = 0
@@ -85,7 +85,7 @@ def calculate(item):
 
             contract_amount = get_amount(no_conversion, unconverted_amount, currency, date)
             # (2,5) Amount is zero or unconvertable.
-            if contract_amount in (0, None):
+            if contract_amount in {0, None}:
                 break
 
             # (4) Different signs.
diff --git a/contracting_process/resource_level/consistent/tender_value.py b/contracting_process/resource_level/consistent/tender_value.py
index 3a7436d..1f3fb25 100644
--- a/contracting_process/resource_level/consistent/tender_value.py
+++ b/contracting_process/resource_level/consistent/tender_value.py
@@ -38,7 +38,7 @@ def calculate(item):
         planning_amount = convert(planning_amount, planning_currency, "USD", date)
         tender_amount = convert(tender_amount, tender_currency, "USD", date)
 
-    if planning_amount in (0, None) or tender_amount in (0, None):
+    if planning_amount in {0, None} or tender_amount in {0, None}:
         result["meta"] = {"reason": "an amount is zero or unconvertable"}
         return result
 
diff --git a/manage.py b/manage.py
index ee32051..8b0e799 100755
--- a/manage.py
+++ b/manage.py
@@ -46,7 +46,7 @@ def remove(dataset_id, include_filtered, force):
         {"dataset_id": dataset_id},
     )
     row = cursor.fetchone()
-    if not row or row[0] not in (Phase.CHECKED, Phase.DELETED) or row[1] != State.OK:
+    if not row or row[0] not in {Phase.CHECKED, Phase.DELETED} or row[1] != State.OK:
         if force:
             click.secho(
                 f"Forcefully removing dataset {dataset_id} (phase={row[0]}, state={row[1]}). (Its phase should be "
diff --git a/pelican/util/getter.py b/pelican/util/getter.py
index abacf38..d3f9f6b 100644
--- a/pelican/util/getter.py
+++ b/pelican/util/getter.py
@@ -93,7 +93,7 @@ def deep_get(value: Any, path: str, force: type[Any] | None = None) -> Any:
     for part in path.split("."):
         if type(value) is dict and part in value:
             value = value[part]
-        elif force in (dict, list, str):
+        elif force in {dict, list, str}:
             return force()
         else:
             return None
@@ -103,9 +103,9 @@ def deep_get(value: Any, path: str, force: type[Any] | None = None) -> Any:
             return parse_date(value)
         if force is datetime.datetime:
             return parse_datetime(value)
-        if force in (dict, list):
+        if force in {dict, list}:
             value = force()
-        elif force in (float, int, str):
+        elif force in {float, int, str}:
             try:
                 value = force(value)
             except (ValueError, TypeError):
diff --git a/workers/check/dataset.py b/workers/check/dataset.py
index 7753851..3153281 100644
--- a/workers/check/dataset.py
+++ b/workers/check/dataset.py
@@ -44,7 +44,7 @@ def callback(client_state, channel, method, properties, input_message):
         logger.info("Dataset %s: DATASET phase already in-progress", dataset_id)
         ack(client_state, channel, delivery_tag)
         return
-    if dataset["phase"] in (Phase.DATASET, Phase.TIME_VARIANCE, Phase.CHECKED, Phase.DELETED):
+    if dataset["phase"] in {Phase.DATASET, Phase.TIME_VARIANCE, Phase.CHECKED, Phase.DELETED}:
         logger.info("Dataset %s: DATASET phase already complete", dataset_id)
         ack(client_state, channel, delivery_tag)
         return