diff --git a/lib/macro/internal/Cargo.toml b/lib/macro/internal/Cargo.toml
index ba560b4..5f6093f 100644
--- a/lib/macro/internal/Cargo.toml
+++ b/lib/macro/internal/Cargo.toml
@@ -20,6 +20,6 @@ default-features = false
 features = ["alloc"]
 
 [dependencies.syn]
-version = "1"
+version = ">= 1, < 3"
 default-features = false
 features = ["parsing", "proc-macro"]
diff --git a/xtask/src/main.rs b/xtask/src/main.rs
index e446bc6..ceaf53d 100644
--- a/xtask/src/main.rs
+++ b/xtask/src/main.rs
@@ -1,5 +1,3 @@
-#![feature(iter_intersperse)]
-
 use std::borrow::Cow;
 use std::collections::{BTreeMap, BTreeSet, HashSet};
 use std::ffi::OsStr;