diff --git a/Cargo.lock b/Cargo.lock
index ef6e0df..16b96ee 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -129,9 +129,9 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "2.0.110"
+version = "2.0.111"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a99801b5bd34ede4cf3fc688c5919368fea4e4814a4664359503e6015b280aea"
+checksum = "390cc9a294ab71bdb1aa2e99d13be9c753cd2d7bd6560c77118597410c4d2e87"
 dependencies = [
  "proc-macro2",
  "quote",
diff --git a/Cargo.toml b/Cargo.toml
index 28e77c3..100b423 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -11,7 +11,7 @@ repository = "https://github.com/bouzuya/enum-str-conv"
 [dependencies]
 proc-macro2 = "1.0.101"
 quote = "1.0.40"
-syn = "2.0.106"
+syn = "2.0.111"
 
 [dev-dependencies]
 trybuild = "1.0.111"