diff --git a/src/hittable.rs b/src/hittable.rs
index c17b5cc..5f3e67c 100644
--- a/src/hittable.rs
+++ b/src/hittable.rs
@@ -103,17 +103,17 @@ mod test {
     use super::*;
     use crate::sphere::Sphere;
 
-    fn create_rc_sphere(x: f32, y: f32, z: f32, r: f32) -> rc::Rc<Sphere> {
+    fn create_rc_sphere(x: f32, y: f32, z: f32, r: f32) -> Arc<Sphere> {
         let sphere = Sphere::from((x, y, z, r));
-        rc::Rc::new(sphere)
+        Arc::new(sphere)
     }
 
     /// Ensures that creation of the data structure does not fail
     #[test]
     fn create_list() {
         let mut list = HittableList::new();
-        let item_1: Rc<dyn Hittable> = create_rc_sphere(0., 1., 2., 50.);
-        let item_2: Rc<dyn Hittable> = create_rc_sphere(100., 1., 2., 1.);
+        let item_1: Arc<dyn Hittable> = create_rc_sphere(0., 1., 2., 50.);
+        let item_2: Arc<dyn Hittable> = create_rc_sphere(100., 1., 2., 1.);
 
         list.push(&item_1);
         list.push(&item_2);
@@ -125,8 +125,8 @@ mod test {
     #[test]
     fn clear_list() {
         let mut list = HittableList::new();
-        let item_1: Rc<dyn Hittable> = create_rc_sphere(0., 1., 2., 50.);
-        let item_2: Rc<dyn Hittable> = create_rc_sphere(100., 1., 2., 1.);
+        let item_1: Arc<dyn Hittable> = create_rc_sphere(0., 1., 2., 50.);
+        let item_2: Arc<dyn Hittable> = create_rc_sphere(100., 1., 2., 1.);
 
         list.push(&item_1);
         list.push(&item_2);
@@ -141,8 +141,8 @@ mod test {
     #[test]
     fn hit_one_thing() {
         let mut list = HittableList::new();
-        let item_1: Rc<dyn Hittable> = create_rc_sphere(0., 1., 2., 0.25);
-        let item_2: Rc<dyn Hittable> = create_rc_sphere(100., 1., 2., 1.);
+        let item_1: Arc<dyn Hittable> = create_rc_sphere(0., 1., 2., 0.25);
+        let item_2: Arc<dyn Hittable> = create_rc_sphere(100., 1., 2., 1.);
 
         let origin = vec3::Vec3(0., 0., 0.);