diff --git a/Cargo.toml b/Cargo.toml
index ed186a0..43f5552 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -19,8 +19,8 @@ syn = { version = "1.0", features = ["full", "visit-mut"] }
 
 [dev-dependencies]
 rustversion = "1.0"
-tracing = "0.1.14"
-tracing-attributes = "0.1.8"
+tracing = "0.1"
+tracing-attributes = "0.2"
 tracing-futures = "0.2"
 trybuild = { version = "1.0.19", features = ["diff"] }
 
diff --git a/src/expand.rs b/src/expand.rs
index 4986db0..6c3f214 100644
--- a/src/expand.rs
+++ b/src/expand.rs
@@ -308,6 +308,7 @@ fn transform_block(
         Box::pin(async move {
             let __ret: #ret_ty = {
                 #(#decls)*
+                let __async_trait: ();
                 #(#stmts)*
             };