To make this recipe gluten-free, substitute the soy sauce with a gluten-free variety such as tamari or coconut aminos. Ensure the red curry paste you use is labeled gluten-free, as some brands may include gluten-containing additives. Finally, double-check the chicken broth for any gluten ingredients. With these simple swaps, you can enjoy this Coconut Curry Noodle Soup as a gluten-free dish.