diff --git a/Cargo.toml b/Cargo.toml
index b16323b..f37133f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -21,7 +21,7 @@ backtrace = { version = "0.3.51", optional = true }
 [dev-dependencies]
 futures = { version = "0.3", default-features = false }
 rustversion = "1.0.6"
-syn = { version = "1.0", features = ["full"] }
+syn = { version = "2.0", features = ["full"] }
 thiserror = "1.0"
 trybuild = { version = "1.0.66", features = ["diff"] }