diff --git a/pyproject.toml b/pyproject.toml
index 776d2b8aef..ad3cce68ed 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -111,7 +111,7 @@ exclude = [
 force-exclude = true
 
 [tool.ruff.lint]
-select = ["E711", "E721", "E9", "F541", "F63", "F7", "F81", "F82"]
+select = ["E711", "E713", "E721", "E9", "F541", "F63", "F7", "F81", "F82"]
 
 [tool.towncrier]
 directory = "changelog.d"
diff --git a/python/nav/bin/macwatch.py b/python/nav/bin/macwatch.py
index 45be694515..6b7761c43d 100755
--- a/python/nav/bin/macwatch.py
+++ b/python/nav/bin/macwatch.py
@@ -58,7 +58,7 @@ def prioritize_location(cam_objects):
     # that we ignore it for the time.
     prioritized_cams = {0: []}
     for value in LOCATION_PRIORITY.values():
-        if not value in prioritized_cams:
+        if value not in prioritized_cams:
             prioritized_cams[value] = []
     for curr_cam in cam_objects:
         category = curr_cam.netbox.category_id
diff --git a/python/nav/ipdevpoll/plugins/sensors.py b/python/nav/ipdevpoll/plugins/sensors.py
index 7defdb939e..fb0d4f5c9a 100644
--- a/python/nav/ipdevpoll/plugins/sensors.py
+++ b/python/nav/ipdevpoll/plugins/sensors.py
@@ -204,7 +204,7 @@ def _find_submodules(name):
     pyfiles = (
         n
         for n in os.listdir(directory)
-        if (n.endswith('.py') or n.endswith('.pyc')) and not n[0] in '_.'
+        if (n.endswith('.py') or n.endswith('.pyc')) and n[0] not in '_.'
     )
     names = (os.path.splitext(n)[0] for n in pyfiles)
     return ["{}.{}".format(name, n) for n in names]
diff --git a/python/nav/web/geomap/graph.py b/python/nav/web/geomap/graph.py
index 2b38513a86..17f3672f5c 100644
--- a/python/nav/web/geomap/graph.py
+++ b/python/nav/web/geomap/graph.py
@@ -75,8 +75,8 @@ def build_graph(db_results):
     # create Edge objects:
     for connection in connections.values():
         if (
-            not connection['forward']['local_netboxid'] in graph.nodes
-            or not connection['reverse']['local_netboxid'] in graph.nodes
+            connection['forward']['local_netboxid'] not in graph.nodes
+            or connection['reverse']['local_netboxid'] not in graph.nodes
         ):
             continue
         graph.add_edge(
diff --git a/python/nav/web/seeddb/utils/move.py b/python/nav/web/seeddb/utils/move.py
index 9c4776701e..b8bdc92af7 100644
--- a/python/nav/web/seeddb/utils/move.py
+++ b/python/nav/web/seeddb/utils/move.py
@@ -75,7 +75,7 @@ def move(request, model, form_model, redirect, title_attr='id', extra_context=No
 
             # If nothing is selected, don't update
             for key in foreign_keys:
-                if not form.cleaned_data[key] is None:
+                if form.cleaned_data[key] is not None:
                     data[key] = form.cleaned_data[key]
 
             # Update
@@ -139,7 +139,7 @@ def _parse_value_differences(values, data, title_attr, fields):
         if data:
             new_values = []
             for attr in fields:
-                if not data[attr] is None:
+                if data[attr] is not None:
                     new_values.append(("New %s" % attr, data[attr]))
                 else:
                     new_values.append(("New %s" % attr, obj[attr]))
diff --git a/tools/eventgenerators/moduleevent.py b/tools/eventgenerators/moduleevent.py
index 29e46740df..832c95c766 100755
--- a/tools/eventgenerators/moduleevent.py
+++ b/tools/eventgenerators/moduleevent.py
@@ -65,7 +65,7 @@ def main():
         box, module = spec.split(":")
         cursor.execute(sql, (box, module))
         for deviceid, netboxid, moduleid, sysname, modulename in cursor.fetchall():
-            if not deviceid in device_dupes:
+            if deviceid not in device_dupes:
                 netboxes.append((deviceid, netboxid, moduleid))
                 sysnames.append((sysname, modulename))
             device_dupes.add(deviceid)
diff --git a/tools/eventgenerators/snmpevent.py b/tools/eventgenerators/snmpevent.py
index 148a3cc702..69499e9cda 100755
--- a/tools/eventgenerators/snmpevent.py
+++ b/tools/eventgenerators/snmpevent.py
@@ -80,7 +80,7 @@ def handler(nblist, state):
 
     database.execute(sql)
     for netboxid, sysname, typeid in database.fetchall():
-        if not netboxid in nbdup:
+        if netboxid not in nbdup:
             nb.append(netboxid)
             sysnames.append(sysname)
         nbdup.add(netboxid)