diff --git a/gtk4-macros/Cargo.toml b/gtk4-macros/Cargo.toml
index f7d7cb92b013..f37bea0ebcbe 100644
--- a/gtk4-macros/Cargo.toml
+++ b/gtk4-macros/Cargo.toml
@@ -26,7 +26,7 @@ proc-macro-crate = "1.0"
 proc-macro-error = "1.0"
 proc-macro2 = "1.0"
 quote = "1.0"
-syn = {version = "1.0", features = ["full"]}
+syn = {version = "2.0", features = ["full"]}
 
 [dev-dependencies]
 futures-channel = "0.3"