diff --git a/app.py b/app.py
index 64ad46c..97ecb62 100755
--- a/app.py
+++ b/app.py
@@ -14,7 +14,7 @@
 
 app = Flask(__name__)
 fake = Faker()
-alphanumeric_only = re.compile("[\W_]+")
+alphanumeric_only = re.compile(r"[\W_]+")
 phone_pattern = re.compile(r"^[\d\+\-\(\) ]+$")
 
 twilio_number = os.environ.get("TWILIO_CALLER_ID")
diff --git a/requirements.txt b/requirements.txt
index 1e7f034..7b03434 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,3 +3,4 @@ twilio~=6.38.1
 faker~=4.0.3
 python-dotenv==0.13.0
 pytest==5.4.1
+Werkzeug >= 2, < 3