diff --git a/Cargo.lock b/Cargo.lock
index 0e46a72..0f64826 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -116,9 +116,9 @@ checksum = "d767eb0aabc880b29956c35734170f26ed551a859dbd361d140cdbeca61ab1e2"
 
 [[package]]
 name = "syn"
-version = "2.0.119"
+version = "3.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "872831b642d1a07999a962a351ed35b955ea2cfc8f3862091e2a240a84f17297"
+checksum = "a207d6d6a2b7fc470b80443726053f18a2481b7e1eee970597051596567987a3"
 dependencies = [
  "proc-macro2",
  "quote",
diff --git a/impl/Cargo.toml b/impl/Cargo.toml
index d58644f..62ed483 100644
--- a/impl/Cargo.toml
+++ b/impl/Cargo.toml
@@ -18,7 +18,7 @@ proc-macro = true
 proc-macro2 = "1.0.106"
 quote = "1.0.45"
 regex = "1.12.4"
-syn = { version = "2.0.117", features = [] }
+syn = { version = "3.0.2", features = [] }
 
 [dev-dependencies]
 error-stack = "0.8.0"
diff --git a/impl/src/types/util.rs b/impl/src/types/util.rs
index 42ef080..fc1482a 100644
--- a/impl/src/types/util.rs
+++ b/impl/src/types/util.rs
@@ -2,7 +2,7 @@ use proc_macro2::TokenStream as TokenStream2;
 use quote::{ToTokens, quote};
 use syn::{
     Attribute, GenericParam, Ident, Lifetime, Path, TraitBound,
-    TraitBoundModifier, TypeParamBound,
+    TraitBoundModifiers, TypeParamBound,
     punctuated::Punctuated,
     spanned::Spanned as _,
     token::{Colon, Comma},
@@ -59,12 +59,10 @@ pub(crate) fn remove_generic_default(param: &mut GenericParam) {
     use GenericParam as GP;
     match *param {
         GP::Const(ref mut const_p) => {
-            const_p.eq_token = None;
             const_p.default = None;
         }
 
         GP::Type(ref mut type_p) => {
-            type_p.eq_token = None;
             type_p.default = None;
         }
 
@@ -113,8 +111,9 @@ pub(crate) fn add_debug_trait_bound(param: &mut GenericParam) {
         type_p.colon_token = Some(Colon(type_p.span()));
         type_p.bounds.push(TypeParamBound::Trait(TraitBound {
             paren_token: None,
-            modifier: TraitBoundModifier::None,
             lifetimes: None,
+            modifiers: TraitBoundModifiers::default(),
+            maybe: None,
             path: trait_path,
         }));
     }