diff --git a/app/Cargo.lock b/app/Cargo.lock
index ad9d7d9..b4e1c6b 100644
--- a/app/Cargo.lock
+++ b/app/Cargo.lock
@@ -207,7 +207,7 @@ version = "0.1.3"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 3.0.0",
  "trybuild",
 ]
 
@@ -217,7 +217,7 @@ version = "0.1.3"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 3.0.0",
  "trybuild",
 ]
 
@@ -421,7 +421,7 @@ checksum = "d540f220d3187173da220f885ab66608367b6574e925011a9353e4badda91d79"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.119",
 ]
 
 [[package]]
@@ -454,9 +454,20 @@ checksum = "f8fadd59c855ef2080decdef8ff161eb6661b86933c9d82e5ba29dc602a55aba"
 
 [[package]]
 name = "syn"
-version = "2.0.118"
+version = "2.0.119"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1b9ae57f904213ebb649ce6895b8a66c66f0203b9319718f69a5612a065b1422"
+checksum = "872831b642d1a07999a962a351ed35b955ea2cfc8f3862091e2a240a84f17297"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
+[[package]]
+name = "syn"
+version = "3.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f2fac314a64dc9a36e61a9eb4261a5e9bbfbc922b27e518af97bc32b926cf967"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -495,7 +506,7 @@ checksum = "ebc4ee7f67670e9b64d05fa4253e753e016c6c95ff35b89b7941d6b856dec1d5"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.119",
 ]
 
 [[package]]
@@ -626,7 +637,7 @@ checksum = "1ae7f38b72ec2a254e2b87ef277cf2cd4fb97cbebf944faa6f33354da0867930"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.119",
 ]
 
 [[package]]
diff --git a/app/Cargo.toml b/app/Cargo.toml
index ccddaf4..7228e49 100644
--- a/app/Cargo.toml
+++ b/app/Cargo.toml
@@ -39,7 +39,7 @@ proptest = { version = "1", default-features = false, features = ["std", "bit-se
 thiserror = "2"
 # anyhow for application/binary/test glue; the library's public errors stay typed.
 anyhow = "1"
-syn = { version = "2", features = ["full", "extra-traits"] }
+syn = { version = "3", features = ["full", "extra-traits"] }
 quote = "1"
 proc-macro2 = "1"
 serde = { version = "1", features = ["derive"] }