diff --git a/tao-macros/Cargo.toml b/tao-macros/Cargo.toml
index ebc511f07..5db4f24e7 100644
--- a/tao-macros/Cargo.toml
+++ b/tao-macros/Cargo.toml
@@ -19,4 +19,4 @@ default = [ ]
 [dependencies]
 proc-macro2 = "1"
 quote = "1"
-syn = { version = "1", features = [ "full" ] }
+syn = { version = "2", features = [ "full" ] }