diff --git a/Cargo.lock b/Cargo.lock
index 2743eede14e..25033316cc3 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -536,7 +536,7 @@ dependencies = [
  "lz4_flex",
  "proc-macro2",
  "quote",
- "syn 2.0.119",
+ "syn 3.0.3",
  "synstructure",
  "test-case",
 ]
diff --git a/Cargo.toml b/Cargo.toml
index 66ce0410157..0d39517ede3 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -109,7 +109,7 @@ smol = "2.0.2"
 rustyline = { version = "18.0.0", default-features = false }
 dhat = "0.3.3"
 quote = "1.0.45"
-syn = { version = "2.0.116", default-features = false }
+syn = { version = "3.0.3", default-features = false }
 proc-macro2 = "1.0"
 synstructure = "0.13"
 measureme = "12.0.3"