diff --git a/Cargo.toml b/Cargo.toml
index cab7a7b..3ee20e8 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -16,8 +16,8 @@ edition = "2018"
 proc-macro = true
 
 [dependencies]
-syn = { version = "1.0", features = ["full"] }
+syn = { version = "2.0", default-features = false }
 quote = "1.0"
 
 [dev-dependencies]
-async-std = "1.9.0"
+async-std = "1.13.0"