diff --git a/Cargo.lock b/Cargo.lock
index eb89f25..3614e7d 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -162,7 +162,7 @@ dependencies = [
  "itertools 0.15.0",
  "proc-macro2",
  "quote",
- "syn 2.0.118",
+ "syn 3.0.2",
  "unicode-segmentation",
 ]
 
@@ -174,7 +174,7 @@ dependencies = [
  "bluejay-typegen-codegen",
  "proc-macro2",
  "quote",
- "syn 2.0.118",
+ "syn 3.0.2",
 ]
 
 [[package]]
@@ -461,7 +461,7 @@ dependencies = [
  "heck",
  "proc-macro2",
  "quote",
- "syn 2.0.118",
+ "syn 2.0.119",
 ]
 
 [[package]]
@@ -712,7 +712,7 @@ dependencies = [
  "quote",
  "regex-syntax",
  "rustc_version",
- "syn 2.0.118",
+ "syn 2.0.119",
 ]
 
 [[package]]
@@ -792,7 +792,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "479ca8adacdd7ce8f1fb39ce9ecccbfe93a3f1344b3d0d97f20bc0196208f62b"
 dependencies = [
  "proc-macro2",
- "syn 2.0.118",
+ "syn 2.0.119",
 ]
 
 [[package]]
@@ -1031,14 +1031,14 @@ dependencies = [
  "heck",
  "proc-macro2",
  "quote",
- "syn 2.0.118",
+ "syn 2.0.119",
 ]
 
 [[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",
@@ -1232,7 +1232,7 @@ dependencies = [
  "bumpalo",
  "proc-macro2",
  "quote",
- "syn 2.0.118",
+ "syn 2.0.119",
  "wasm-bindgen-shared",
 ]
 
@@ -1349,7 +1349,7 @@ dependencies = [
  "heck",
  "indexmap",
  "prettyplease",
- "syn 2.0.118",
+ "syn 2.0.119",
  "wasm-metadata",
  "wit-bindgen-core",
  "wit-component",
@@ -1365,7 +1365,7 @@ dependencies = [
  "prettyplease",
  "proc-macro2",
  "quote",
- "syn 2.0.118",
+ "syn 2.0.119",
  "wit-bindgen-core",
  "wit-bindgen-rust",
 ]
@@ -1430,7 +1430,7 @@ checksum = "0e8bc7269b54418e7aeeef514aa68f8690b8c0489a06b0136e5f57c4c5ccab89"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.118",
+ "syn 2.0.119",
 ]
 
 [[package]]
diff --git a/bluejay-typegen-codegen/Cargo.toml b/bluejay-typegen-codegen/Cargo.toml
index 49e6a90..d368d76 100644
--- a/bluejay-typegen-codegen/Cargo.toml
+++ b/bluejay-typegen-codegen/Cargo.toml
@@ -13,7 +13,7 @@ description = "Code generation utilities for `bluejay-typegen-macro`"
 bluejay-core = { workspace = true }
 bluejay-parser = { workspace = true, features = ["format-errors"] }
 bluejay-validator = { workspace = true }
-syn = { version = "2.0", features = ["full"] }
+syn = { version = "3.0", features = ["full"] }
 quote = "1.0"
 proc-macro2 = "1.0"
 convert_case = "0.10"
diff --git a/bluejay-typegen-codegen/src/enum_type_definition.rs b/bluejay-typegen-codegen/src/enum_type_definition.rs
index 6fde0ce..bf43ad2 100644
--- a/bluejay-typegen-codegen/src/enum_type_definition.rs
+++ b/bluejay-typegen-codegen/src/enum_type_definition.rs
@@ -60,7 +60,7 @@ impl<'a, S: SchemaDefinition, C: CodeGenerator> EnumTypeDefinitionBuilder<'a, S,
                 .code_generator
                 .additional_impls_for_enum(instance.enum_type_definition)
                 .into_iter()
-                .map(Into::into),
+                .map(syn::Item::Impl),
         );
 
         items
diff --git a/bluejay-typegen-codegen/src/executable_definition/executable_enum_builder.rs b/bluejay-typegen-codegen/src/executable_definition/executable_enum_builder.rs
index 6e6a639..9ced5f7 100644
--- a/bluejay-typegen-codegen/src/executable_definition/executable_enum_builder.rs
+++ b/bluejay-typegen-codegen/src/executable_definition/executable_enum_builder.rs
@@ -39,7 +39,7 @@ impl<'a, C: CodeGenerator> ExecutableEnumBuilder<'a, C> {
                 .code_generator
                 .additional_impls_for_executable_enum(instance.executable_enum)
                 .into_iter()
-                .map(Into::into),
+                .map(syn::Item::Impl),
         );
 
         items.extend(instance.nested_module());
diff --git a/bluejay-typegen-codegen/src/executable_definition/executable_struct_builder.rs b/bluejay-typegen-codegen/src/executable_definition/executable_struct_builder.rs
index e6acb21..8049e10 100644
--- a/bluejay-typegen-codegen/src/executable_definition/executable_struct_builder.rs
+++ b/bluejay-typegen-codegen/src/executable_definition/executable_struct_builder.rs
@@ -37,7 +37,7 @@ impl<'a, C: CodeGenerator> ExecutableStructBuilder<'a, C> {
                 .code_generator
                 .additional_impls_for_executable_struct(instance.executable_struct)
                 .into_iter()
-                .map(Into::into),
+                .map(syn::Item::Impl),
         );
 
         items.extend(instance.nested_module());
diff --git a/bluejay-typegen-codegen/src/input_object_type_definition.rs b/bluejay-typegen-codegen/src/input_object_type_definition.rs
index fe483a7..40c12cf 100644
--- a/bluejay-typegen-codegen/src/input_object_type_definition.rs
+++ b/bluejay-typegen-codegen/src/input_object_type_definition.rs
@@ -80,7 +80,7 @@ impl<'a, S: SchemaDefinition, C: CodeGenerator> InputObjectTypeDefinitionBuilder
                 .code_generator()
                 .additional_impls_for_one_of_input_object(self.input_object_type_definition)
                 .into_iter()
-                .map(Into::into),
+                .map(syn::Item::Impl),
         );
 
         items
@@ -128,7 +128,7 @@ impl<'a, S: SchemaDefinition, C: CodeGenerator> InputObjectTypeDefinitionBuilder
                 .code_generator()
                 .additional_impls_for_input_object(self.input_object_type_definition)
                 .into_iter()
-                .map(Into::into),
+                .map(syn::Item::Impl),
         );
 
         items
diff --git a/bluejay-typegen-codegen/src/lib.rs b/bluejay-typegen-codegen/src/lib.rs
index 6c94aa0..a9d4695 100644
--- a/bluejay-typegen-codegen/src/lib.rs
+++ b/bluejay-typegen-codegen/src/lib.rs
@@ -234,7 +234,7 @@ fn custom_scalar_borrows(
                         pub type #ident #lifetime = #ty;
                     };
                     if let Some((_, items)) = module.content.as_mut() {
-                        items.push(alias.into());
+                        items.push(syn::Item::Type(alias));
                     }
                     custom_scalars.insert(
                         name,
@@ -329,7 +329,7 @@ fn process_module_item<S: SchemaDefinition, C: CodeGenerator>(
                         )?;
                         module.content = Some((syn::token::Brace::default(), items));
                         module.attrs = Vec::new();
-                        Ok(module.into())
+                        Ok(syn::Item::Mod(module))
                     } else {
                         Err(syn::Error::new(
                             list.delimiter.span().open(),
diff --git a/bluejay-typegen-macro/Cargo.toml b/bluejay-typegen-macro/Cargo.toml
index 5862941..6d86b60 100644
--- a/bluejay-typegen-macro/Cargo.toml
+++ b/bluejay-typegen-macro/Cargo.toml
@@ -14,7 +14,7 @@ description = "Macros for `bluejay-typegen`"
 [dependencies]
 bluejay-core = { workspace = true }
 bluejay-typegen-codegen = { workspace = true }
-syn = { version = "2.0", features = ["full"] }
+syn = { version = "3.0", features = ["full"] }
 quote = "1.0"
 proc-macro2 = "1.0"
 
diff --git a/bluejay-typegen-macro/src/lib.rs b/bluejay-typegen-macro/src/lib.rs
index 6ef76ff..a2897c1 100644
--- a/bluejay-typegen-macro/src/lib.rs
+++ b/bluejay-typegen-macro/src/lib.rs
@@ -125,7 +125,7 @@ impl CodeGenerator for SerdeCodeGenerator {
 
         let fields_named: syn::FieldsNamed = parse_quote! { { #(#fields,)* } };
 
-        fields_named.into()
+        syn::Fields::Named(fields_named)
     }
 
     fn attributes_for_executable_enum(