diff --git a/zerver/lib/email_mirror.py b/zerver/lib/email_mirror.py
index 4730b541c5..406dd00ccd 100644
--- a/zerver/lib/email_mirror.py
+++ b/zerver/lib/email_mirror.py
@@ -311,7 +311,7 @@ def filter_footer(text: str) -> str:
         # isn't a trivial footer structure.
         return text
 
-    return re.split(r"^\s*--\s*$", text, 1, flags=re.MULTILINE)[0].strip()
+    return re.split(r"^\s*--\s*$", text, maxsplit=1, flags=re.MULTILINE)[0].strip()
 
 
 def extract_and_upload_attachments(message: EmailMessage, realm: Realm, sender: UserProfile) -> str:
diff --git a/zerver/lib/widget.py b/zerver/lib/widget.py
index c3be37810c..2eabedf08c 100644
--- a/zerver/lib/widget.py
+++ b/zerver/lib/widget.py
@@ -33,7 +33,7 @@ def get_extra_data_from_widget_type(content: str, widget_type: Optional[str]) ->
         for line in lines:
             # If someone is using the list syntax, we remove it
             # before adding an option.
-            option = re.sub(r"(\s*[-*]?\s*)", "", line.strip(), 1)
+            option = re.sub(r"(\s*[-*]?\s*)", "", line.strip(), count=1)
             if len(option) > 0:
                 options.append(option)
         extra_data = {
diff --git a/zerver/migrations/0041_create_attachments_for_old_messages.py b/zerver/migrations/0041_create_attachments_for_old_messages.py
index f9fd4ac39d..18aa8da1c1 100644
--- a/zerver/migrations/0041_create_attachments_for_old_messages.py
+++ b/zerver/migrations/0041_create_attachments_for_old_messages.py
@@ -11,7 +11,7 @@ attachment_url_re = re.compile(r"[/\-]user[\-_]uploads[/\.-].*?(?=[ )]|\Z)")
 def attachment_url_to_path_id(attachment_url: str) -> str:
     path_id_raw = re.sub(r"[/\-]user[\-_]uploads[/\.-]", "", attachment_url)
     # Remove any extra '.' after file extension. These are probably added by the user
-    return re.sub("[.]+$", "", path_id_raw, re.M)
+    return re.sub("[.]+$", "", path_id_raw, flags=re.M)
 
 
 def check_and_create_attachments(apps: StateApps, schema_editor: BaseDatabaseSchemaEditor) -> None:
diff --git a/zerver/webhooks/gitlab/view.py b/zerver/webhooks/gitlab/view.py
index f9d1c679c9..dc4afa4f67 100644
--- a/zerver/webhooks/gitlab/view.py
+++ b/zerver/webhooks/gitlab/view.py
@@ -89,7 +89,9 @@ def get_issue_created_event_body(payload: WildValue, include_title: bool) -> str
     # Filter out multiline hidden comments
     if description:
         stringified_description = description.tame(check_string)
-        stringified_description = re.sub("<!--.*?-->", "", stringified_description, 0, re.DOTALL)
+        stringified_description = re.sub(
+            "<!--.*?-->", "", stringified_description, count=0, flags=re.DOTALL
+        )
         stringified_description = stringified_description.rstrip()
     else:
         stringified_description = None