diff --git a/pyproject.toml b/pyproject.toml
index e38d8ec214..0d2dc0bb34 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -103,15 +103,22 @@ select = [
     "ANN", # annotations
     "B", # bugbear
     "C4", # comprehensions
+    "DTZ", # naive datetime
     "E", # style errors
     "F", # flakes
     "I", # import sorting
+    "ISC", # string concatenation
     "N", # naming
     "PGH", # pygrep-hooks
+    "PIE", # miscellaneous
     "PLC", # pylint convention
     "PLE", # pylint error
     "PLR", # pylint refactor
+    "PLW", # pylint warning
+    "Q", # quotes
     "RUF", # Ruff
+    "S", # security
+    "SIM", # simplify
     "T10", # debugger
     "UP", # upgrade
     "W", # style warnings
@@ -133,6 +140,10 @@ ignore = [
     "N806", # Variable in function should be lowercase
     "RUF001", # String contains ambiguous unicode character
     "RUF003", # Comment contains ambiguous unicode character
+    "S101", # Use of `assert` detected
+    "S105", # Possible hardcoded password
+    "S106", # Possible hardcoded password
+    "S107", # Possible hardcoded password
 ]
 line-length = 100
 src = [".", "tools"]
diff --git a/scripts/lib/setup_path.py b/scripts/lib/setup_path.py
index 6062aeccce..2861b19eee 100644
--- a/scripts/lib/setup_path.py
+++ b/scripts/lib/setup_path.py
@@ -12,7 +12,7 @@ def setup_path() -> None:
         activate_this = os.path.join(venv, "bin", "activate_this.py")
         activate_locals = dict(__file__=activate_this)
         with open(activate_this) as f:
-            exec(f.read(), activate_locals)
+            exec(f.read(), activate_locals)  # noqa: S102
         # Check that the python version running this function
         # is same as python version that created the virtualenv.
         python_version = "python{}.{}".format(*sys.version_info[:2])
diff --git a/scripts/lib/zulip_tools.py b/scripts/lib/zulip_tools.py
index 357e0d15c2..5a9f329e62 100755
--- a/scripts/lib/zulip_tools.py
+++ b/scripts/lib/zulip_tools.py
@@ -165,7 +165,7 @@ def su_to_zulip(save_suid: bool = False) -> None:
 
 
 def make_deploy_path() -> str:
-    timestamp = datetime.datetime.now().strftime(TIMESTAMP_FORMAT)
+    timestamp = datetime.datetime.now().strftime(TIMESTAMP_FORMAT)  # noqa: DTZ005
     return os.path.join(DEPLOYMENTS_DIR, timestamp)
 
 
@@ -268,7 +268,9 @@ def get_recent_deployments(threshold_days: int) -> Set[str]:
     # Returns a list of deployments not older than threshold days
     # including `/root/zulip` directory if it exists.
     recent = set()
-    threshold_date = datetime.datetime.now() - datetime.timedelta(days=threshold_days)
+    threshold_date = datetime.datetime.now() - datetime.timedelta(  # noqa: DTZ005
+        days=threshold_days
+    )
     for dir_name in os.listdir(DEPLOYMENTS_DIR):
         target_dir = os.path.join(DEPLOYMENTS_DIR, dir_name)
         if not os.path.isdir(target_dir):
@@ -278,7 +280,7 @@ def get_recent_deployments(threshold_days: int) -> Set[str]:
             # Skip things like "lock" that aren't actually a deployment directory
             continue
         try:
-            date = datetime.datetime.strptime(dir_name, TIMESTAMP_FORMAT)
+            date = datetime.datetime.strptime(dir_name, TIMESTAMP_FORMAT)  # noqa: DTZ007
             if date >= threshold_date:
                 recent.add(target_dir)
         except ValueError:
@@ -295,7 +297,7 @@ def get_recent_deployments(threshold_days: int) -> Set[str]:
 def get_threshold_timestamp(threshold_days: int) -> int:
     # Given number of days, this function returns timestamp corresponding
     # to the time prior to given number of days.
-    threshold = datetime.datetime.now() - datetime.timedelta(days=threshold_days)
+    threshold = datetime.datetime.now() - datetime.timedelta(days=threshold_days)  # noqa: DTZ005
     threshold_timestamp = int(time.mktime(threshold.utctimetuple()))
     return threshold_timestamp
 
diff --git a/tools/lib/provision.py b/tools/lib/provision.py
index 8cb79565d9..8f2c367001 100755
--- a/tools/lib/provision.py
+++ b/tools/lib/provision.py
@@ -461,7 +461,7 @@ def main(options: argparse.Namespace) -> NoReturn:
     activate_this = "/srv/zulip-py3-venv/bin/activate_this.py"
     provision_inner = os.path.join(ZULIP_PATH, "tools", "lib", "provision_inner.py")
     with open(activate_this) as f:
-        exec(f.read(), dict(__file__=activate_this))
+        exec(f.read(), dict(__file__=activate_this))  # noqa: S102
     os.execvp(
         provision_inner,
         [
diff --git a/tools/linter_lib/custom_check.py b/tools/linter_lib/custom_check.py
index 52703840fc..c905fdca2a 100644
--- a/tools/linter_lib/custom_check.py
+++ b/tools/linter_lib/custom_check.py
@@ -376,12 +376,6 @@ python_rules = RuleList(
             },
             "description": "Please use access_stream_by_*() to fetch Stream objects",
         },
-        {
-            "pattern": "datetime[.](now|utcnow)",
-            "include_only": {"zerver/", "analytics/"},
-            "description": "Don't use datetime in backend code.\n"
-            "See https://zulip.readthedocs.io/en/latest/contributing/code-style.html#naive-datetime-objects",
-        },
         {
             "pattern": "from os.path",
             "description": "Don't use from when importing from the standard library",
diff --git a/zerver/webhooks/taiga/view.py b/zerver/webhooks/taiga/view.py
index 168779b73a..193694587f 100644
--- a/zerver/webhooks/taiga/view.py
+++ b/zerver/webhooks/taiga/view.py
@@ -308,7 +308,7 @@ def parse_message(
         events.append(parse_create_or_delete(message))
     elif message["action"].tame(check_string) == "change":
         if message["change"]["diff"]:
-            for value in message["change"]["diff"].keys():
+            for value in message["change"]["diff"].keys():  # noqa: SIM118
                 parsed_event = parse_change_event(value, message)
                 if parsed_event:
                     events.append(parsed_event)