diff --git a/ax/core/observation.py b/ax/core/observation.py
index 28b189bed55..0bcee138eac 100644
--- a/ax/core/observation.py
+++ b/ax/core/observation.py
@@ -7,7 +7,6 @@
 from __future__ import annotations
 
 import json
-import warnings
 from copy import deepcopy
 from typing import Dict, Iterable, List, Optional, Set, Tuple