diff --git a/qcs_api_client/client/_configuration/environment.py b/qcs_api_client/client/_configuration/environment.py
index 249b723..3120bb4 100644
--- a/qcs_api_client/client/_configuration/environment.py
+++ b/qcs_api_client/client/_configuration/environment.py
@@ -3,7 +3,10 @@
 
 from pydantic import BaseModel
 from pydantic.v1.utils import deep_update
-from pydantic_settings.sources import _annotation_is_complex
+try:
+    from pydantic_settings.sources.utils import _annotation_is_complex
+except ImportError:
+    from pydantic_settings.sources import _annotation_is_complex
 
 
 class _EnvironmentBaseModel(BaseModel):