diff --git a/spec/Cargo.lock b/spec/Cargo.lock
index e593aaa..b53df41 100644
--- a/spec/Cargo.lock
+++ b/spec/Cargo.lock
@@ -22,7 +22,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "strsim",
- "syn 3.0.5",
+ "syn",
 ]
 
 [[package]]
@@ -33,7 +33,7 @@ checksum = "2ac7135c3ef02b2f7833bbeb1be5ba7f966dcde8a87c6b87f65a778d71a02785"
 dependencies = [
  "darling_core",
  "quote",
- "syn 3.0.5",
+ "syn",
 ]
 
 [[package]]
@@ -65,7 +65,7 @@ name = "spec"
 version = "0.1.0"
 dependencies = [
  "darling",
- "syn 2.0.119",
+ "syn",
 ]
 
 [[package]]
@@ -74,17 +74,6 @@ version = "0.11.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7da8b5736845d9f2fcb837ea5d9e2628564b3b043a70948a3f0b778838c5fb4f"
 
-[[package]]
-name = "syn"
-version = "2.0.119"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "872831b642d1a07999a962a351ed35b955ea2cfc8f3862091e2a240a84f17297"
-dependencies = [
- "proc-macro2",
- "quote",
- "unicode-ident",
-]
-
 [[package]]
 name = "syn"
 version = "3.0.5"
diff --git a/spec/Cargo.toml b/spec/Cargo.toml
index bade990..72bb7df 100644
--- a/spec/Cargo.toml
+++ b/spec/Cargo.toml
@@ -10,5 +10,5 @@ proc-macro = true
 
 [dependencies]
 darling = "0.24.0"
-syn = "2.0.103" # needed for `darling`
+syn = "3.0.0" # needed for `darling`