diff --git a/mcontainer/cli.py b/mcontainer/cli.py
index 5dd344a..4320d8e 100644
--- a/mcontainer/cli.py
+++ b/mcontainer/cli.py
@@ -32,6 +32,7 @@ def main(ctx: typer.Context) -> None:
             driver=None,
             project=None,
             env=[],
+            volume=[],
             name=None,
             no_connect=False,
             no_mount=False,
diff --git a/mcontainer/models.py b/mcontainer/models.py
index fe02360..cd03de1 100644
--- a/mcontainer/models.py
+++ b/mcontainer/models.py
@@ -55,4 +55,6 @@ class Config(BaseModel):
     sessions: Dict[str, dict] = Field(
         default_factory=dict
     )  # Store as dict to avoid serialization issues
-    defaults: Dict[str, str] = Field(default_factory=dict)
+    defaults: Dict[str, object] = Field(
+        default_factory=dict
+    )  # Can store strings, booleans, or other values