diff --git a/Cargo.lock b/Cargo.lock
index 8dd3e9e..a648654 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1707,7 +1707,7 @@ dependencies = [
  "rayon",
  "serde",
  "serde_json",
- "syn 2.0.119",
+ "syn 3.0.3",
  "tempfile",
  "thiserror 2.0.20",
  "toml",
diff --git a/Cargo.toml b/Cargo.toml
index c51cc8b..6643b62 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -46,7 +46,7 @@ globset = "0.4"
 # The Rust source parser behind every per-file item, function-length, and
 # complexity metric. `full` is required to see function bodies; `visit` gives
 # the AST walker the analyzers are written against.
-syn = { version = "2", default-features = false, features = [
+syn = { version = "3", default-features = false, features = [
     "full",
     "parsing",
     "visit",