diff --git a/osc_sdk_python/call.py b/osc_sdk_python/call.py
index 7af28df..123c75a 100644
--- a/osc_sdk_python/call.py
+++ b/osc_sdk_python/call.py
@@ -21,6 +21,7 @@ def __init__(self, logger=None, limiter=None, **kwargs):
         self.limiter: RateLimiter | None = limiter
         self.retry_kwargs = {}
         self.session = Session()
+        self.session.trust_env = False
 
         kwargs = self.update_limiter(**kwargs)
         kwargs = self.update_retry(**kwargs)