diff --git a/canrun/src/core/query.rs b/canrun/src/core/query.rs
index f3425b2..8619e51 100644
--- a/canrun/src/core/query.rs
+++ b/canrun/src/core/query.rs
@@ -57,11 +57,11 @@ pub trait Query<'a> {
     assert_eq!(result, vec![1])
     ```
     */
-    fn query<Q: Reify + 'a>(self, query: Q) -> Box<dyn Iterator<Item = Q::Reified> + 'a>;
+    fn query<Q: Reify + 'a>(self, query: Q) -> impl Iterator<Item = Q::Reified>;
 }
 
 impl<'a, S: StateIterator + 'a> Query<'a> for S {
-    fn query<Q: Reify + 'a>(self, query: Q) -> Box<dyn Iterator<Item = Q::Reified> + 'a> {
+    fn query<Q: Reify + 'a>(self, query: Q) -> impl Iterator<Item = Q::Reified> {
         Box::new(
             self.into_states()
                 .filter_map(move |s| query.reify_in(&s.ready()?)),