diff --git a/tests/test_updater_ng.py b/tests/test_updater_ng.py
index ea830c175a..73437879f8 100644
--- a/tests/test_updater_ng.py
+++ b/tests/test_updater_ng.py
@@ -325,7 +325,7 @@ def test_user_agent(self) -> None:
         self.updater.refresh()
         session = next(iter(self.updater._fetcher._sessions.values()))
         ua = session.headers["User-Agent"]
-        self.assertEqual(ua[:4], "tuf/")
+        self.assertEqual(ua[:11], "python-tuf/")
 
         # test custom UA
         updater = Updater(
@@ -339,7 +339,7 @@ def test_user_agent(self) -> None:
         session = next(iter(updater._fetcher._sessions.values()))
         ua = session.headers["User-Agent"]
 
-        self.assertEqual(ua[:16], "MyApp/1.2.3 tuf/")
+        self.assertEqual(ua[:23], "MyApp/1.2.3 python-tuf/")
 
 
 if __name__ == "__main__":
diff --git a/tuf/ngclient/_internal/requests_fetcher.py b/tuf/ngclient/_internal/requests_fetcher.py
index c931b85a0f..937357a51a 100644
--- a/tuf/ngclient/_internal/requests_fetcher.py
+++ b/tuf/ngclient/_internal/requests_fetcher.py
@@ -141,7 +141,7 @@ def _get_session(self, url: str) -> requests.Session:
             session = requests.Session()
             self._sessions[session_index] = session
 
-            ua = f"tuf/{tuf.__version__} {session.headers['User-Agent']}"
+            ua = f"python-tuf/{tuf.__version__} {session.headers['User-Agent']}"
             if self.app_user_agent is not None:
                 ua = f"{self.app_user_agent} {ua}"
             session.headers["User-Agent"] = ua