diff --git a/crates/goose/Cargo.toml b/crates/goose/Cargo.toml
index 79665e91a..ffff4c8fd 100644
--- a/crates/goose/Cargo.toml
+++ b/crates/goose/Cargo.toml
@@ -187,7 +187,7 @@ schemars = { workspace = true, features = [
     "derive",
 ] }
 shellexpand = { workspace = true }
-indexmap = { version = "2.9", default-features = false, features = ["std"] }
+indexmap = { version = "2.9", default-features = false, features = ["serde", "std"] }
 ignore = { workspace = true }
 rayon = { workspace = true }
 tree-sitter = { workspace = true }