diff --git a/gc/tests/finalize.rs b/gc/tests/finalize.rs
index 448ea86..92e99d3 100644
--- a/gc/tests/finalize.rs
+++ b/gc/tests/finalize.rs
@@ -4,8 +4,8 @@
 extern crate gc_derive;
 extern crate gc;
 
+use gc::{Finalize, Trace};
 use std::cell::Cell;
-use gc::Finalize;
 
 #[derive(PartialEq, Eq, Debug, Clone, Copy)]
 struct Flags(i32, i32);
@@ -40,6 +40,9 @@ impl Finalize for B {
     }
 }
 
+#[derive(Trace, Finalize)]
+struct X(Box<dyn Trace>);
+
 #[test]
 fn drop_triggers_finalize() {
     FLAGS.with(|f| assert_eq!(f.get(), Flags(0, 0)));
diff --git a/gc_derive/Cargo.toml b/gc_derive/Cargo.toml
index 8153155..cbb1cda 100644
--- a/gc_derive/Cargo.toml
+++ b/gc_derive/Cargo.toml
@@ -14,7 +14,7 @@ name = "gc_derive"
 proc-macro = true
 
 [dependencies]
-syn = "0.15"
-proc-macro2 = "0.4"
-quote = "0.6"
-synstructure = "0.10"
+syn = "1.0"
+proc-macro2 = "1.0"
+quote = "1.0"
+synstructure = "0.12"