diff --git a/src/passpredict/sources.py b/src/passpredict/sources.py
index b979d8f..8f45af7 100644
--- a/src/passpredict/sources.py
+++ b/src/passpredict/sources.py
@@ -118,7 +118,7 @@ def _query_tle_from_celestrak(self, satid: int = None):
         """
         Download current TLEs from Celestrak and save them to a JSON file
         """
-        url = 'https://celestrak.com/NORAD/elements/gp.php'
+        url = 'https://celestrak.org/NORAD/elements/gp.php'
         params = {
             'CATNR': satid,
             'FORMAT': 'TLE',
@@ -137,7 +137,7 @@ def _query_tle_category_from_celestrak(self, category: str) -> List[TLE]:
         Enter Celestrak category string.
         Eg. visual, stations, tle-new, weather, noaa, oneweb, starlink
         """
-        url = f'https://celestrak.com/NORAD/elements/{category}.txt'
+        url = f'https://celestrak.org/NORAD/elements/{category}.txt'
         r = httpx.get(url)
         if not r.text or r.status_code >= 300:
             raise CelestrakError(f'Celestrak TLEs for {category}.txt not found')
@@ -180,4 +180,4 @@ def parse_tle(tle_lines):
         raise Exception(f"Invalid TLE strings {tle_lines}")
     satid = int(tle1[2:7])
     tle = TLE(satid, (tle1, tle2), name=name)
-    return tle
\ No newline at end of file
+    return tle