diff --git a/scripts/run_tests.sh b/scripts/run_tests.sh
index abdd75df..72cdad81 100644
--- a/scripts/run_tests.sh
+++ b/scripts/run_tests.sh
@@ -1,5 +1,5 @@
 rm -rf reports
-SQL_LOG_LEVEL=DEBUG python -m pytest \
+APP__LOGGING__SQL_LOG_LEVEL=DEBUG python -m pytest \
   --numprocesses=auto \
   --cov=slackhealthbot \
   --cov-report=xml \
diff --git a/slackhealthbot/settings.py b/slackhealthbot/settings.py
index affb06fc..041ee845 100644
--- a/slackhealthbot/settings.py
+++ b/slackhealthbot/settings.py
@@ -75,7 +75,10 @@ class AppSettings(BaseSettings):
     app: App
     withings: Withings
     fitbit: Fitbit
-    model_config = SettingsConfigDict(yaml_file="config/app-merged.yaml")
+    model_config = SettingsConfigDict(
+        env_nested_delimiter="__",
+        yaml_file="config/app-merged.yaml",
+    )
 
     @classmethod
     def _load_yaml_file(
@@ -101,14 +104,15 @@ def _load_merged_config(cls) -> dict:
     def settings_customise_sources(
         cls,
         settings_cls: BaseSettings,
-        *args,
+        *,
+        env_settings: PydanticBaseSettingsSource,
         **kwargs,
     ) -> tuple[PydanticBaseSettingsSource, ...]:
         merged_config = cls._load_merged_config()
         with open("config/app-merged.yaml", "w", encoding="utf-8") as file:
             yaml.safe_dump(merged_config, file)
         yaml_settings_source = YamlConfigSettingsSource(settings_cls)
-        return (yaml_settings_source,)
+        return (env_settings, yaml_settings_source)
 
 
 class SecretSettings(BaseSettings):