diff --git a/Cargo.lock b/Cargo.lock
index d176ea627f..62e1e0da43 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -630,7 +630,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "serde",
- "syn 1.0.109",
+ "syn 2.0.27",
  "trybuild",
 ]
 
diff --git a/martian-derive/Cargo.toml b/martian-derive/Cargo.toml
index dce0fbb4b1..ae377aba0b 100644
--- a/martian-derive/Cargo.toml
+++ b/martian-derive/Cargo.toml
@@ -9,7 +9,7 @@ license = "MIT"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-syn = {version = "1.0", features = ['full', 'derive', 'parsing', 'printing', 'extra-traits']}
+syn = {version = "2.0", features = ['full', 'derive', 'parsing', 'printing', 'extra-traits']}
 quote = "1.0"
 proc-macro2 = "1.0"
 martian = { path = "../martian" }