diff --git a/Cargo.lock b/Cargo.lock
index 7b1ebc72..e1f22079 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4637,7 +4637,7 @@ dependencies = [
  "spdx",
  "stellar-strkey 0.0.10",
  "stellar-xdr",
- "syn 2.0.119",
+ "syn 3.0.6",
  "tempfile",
  "thiserror 2.0.21",
  "tokio",
diff --git a/Cargo.toml b/Cargo.toml
index 62056b4a..a39f0de5 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -87,7 +87,7 @@ serde    = { version = "1.0",     features = ["derive"] }
 serde_json = "1.0"
 regex    = "1.10"
 toml     = "=1.0.7"
-syn = { version = "2", features = ["full"] }
+syn = { version = "3", features = ["full"] }
 proc-macro2 = { version = "1", features = ["span-locations"] }
 semver   = "1.0"
 spdx     = "0.13.5"