diff --git a/Cargo.lock b/Cargo.lock
index 328ae73..8460881 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -101,7 +101,7 @@ dependencies = [
  "proc-macro-error",
  "proc-macro2",
  "quote",
- "syn 2.0.38",
+ "syn 2.0.39",
 ]
 
 [[package]]
@@ -210,9 +210,9 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "2.0.38"
+version = "2.0.39"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e96b79aaa137db8f61e26363a0c9b47d8b4ec75da28b7d1d614c2303e232408b"
+checksum = "23e78b90f2fcf45d3e842032ce32e3f2d1545ba6636271dcbf24fa306d87be7a"
 dependencies = [
  "proc-macro2",
  "quote",
diff --git a/mono-proc/Cargo.toml b/mono-proc/Cargo.toml
index 1960963..e55fa41 100644
--- a/mono-proc/Cargo.toml
+++ b/mono-proc/Cargo.toml
@@ -10,4 +10,4 @@ proc-macro = true
 proc-macro-error = "1.0.4"
 proc-macro2 = "1.0.66"
 quote = "1.0.33"
-syn = { version = "2.0.29", features = ["full"] }
+syn = { version = "2.0.39", features = ["full"] }