diff --git a/.VERSION b/.VERSION
new file mode 100644
index 0000000..ea7786a
--- /dev/null
+++ b/.VERSION
@@ -0,0 +1 @@
+v1.3.3
diff --git a/setup.py b/setup.py
index 25977d6..ed5a3e5 100644
--- a/setup.py
+++ b/setup.py
@@ -5,7 +5,7 @@
     description="An officially maintained python client for WattTime's API providing access to electricity grid emissions data.",
     long_description=open("README.md").read(),
     long_description_content_type="text/markdown",
-    version="v1.3.3",
+    version=open(".VERSION").read().strip(),
     packages=["watttime"],
     python_requires=">=3.8",
     install_requires=["requests", "pandas>1.0.0", "holidays", "python-dateutil"],
diff --git a/watttime/api.py b/watttime/api.py
index 8be1113..0a208de 100644
--- a/watttime/api.py
+++ b/watttime/api.py
@@ -1,19 +1,22 @@
 import os
-import time
 import threading
 import time
-from datetime import date, datetime, timedelta, time as dt_time
 from collections import defaultdict
+from concurrent.futures import ThreadPoolExecutor, as_completed
+from datetime import date, datetime
+from datetime import time as dt_time
+from datetime import timedelta
 from functools import cache
 from pathlib import Path
 from typing import Any, Dict, List, Literal, Optional, Tuple, Union
-from concurrent.futures import ThreadPoolExecutor, as_completed
 
 import pandas as pd
 import requests
 from dateutil.parser import parse
 from pytz import UTC
 
+VERSION = open(".VERSION").read().strip()
+
 
 class WattTimeBase:
     url_base = os.getenv("WATTTIME_API_URL", "https://api.watttime.org")
@@ -106,7 +109,10 @@ def _login(self):
         self.token_valid_until = datetime.now() + timedelta(minutes=30)
         if not self.token:
             raise Exception("failed to log in, double check your credentials")
-        self.headers = {"Authorization": "Bearer " + self.token}
+        self.headers = {
+            "Authorization": "Bearer " + self.token,
+            "User-Agent": f"watttime-python-sdk-{VERSION}",
+        }
 
     def _is_token_valid(self) -> bool:
         if not self.token_valid_until: