diff --git a/ast/src/gen/fold.rs b/ast/src/gen/fold.rs
index b133b89..eedfc53 100644
--- a/ast/src/gen/fold.rs
+++ b/ast/src/gen/fold.rs
@@ -2896,13 +2896,24 @@ pub fn fold_type_param_type_var<U, F: Fold<U> + ?Sized>(
     #[allow(unused)] folder: &mut F,
     node: TypeParamTypeVar<U>,
 ) -> Result<TypeParamTypeVar<F::TargetU>, F::Error> {
-    let TypeParamTypeVar { name, bound, range } = node;
+    let TypeParamTypeVar {
+        name,
+        bound,
+        default_value,
+        range,
+    } = node;
     let context = folder.will_map_user(&range);
 
     let name = Foldable::fold(name, folder)?;
     let bound = Foldable::fold(bound, folder)?;
+    let default_value = Foldable::fold(default_value, folder)?;
     let range = folder.map_user(range, context)?;
-    Ok(TypeParamTypeVar { name, bound, range })
+    Ok(TypeParamTypeVar {
+        name,
+        bound,
+        default_value,
+        range,
+    })
 }
 impl<T, U> Foldable<T, U> for TypeParamParamSpec<T> {
     type Mapped = TypeParamParamSpec<U>;
@@ -2917,12 +2928,21 @@ pub fn fold_type_param_param_spec<U, F: Fold<U> + ?Sized>(
     #[allow(unused)] folder: &mut F,
     node: TypeParamParamSpec<U>,
 ) -> Result<TypeParamParamSpec<F::TargetU>, F::Error> {
-    let TypeParamParamSpec { name, range } = node;
+    let TypeParamParamSpec {
+        name,
+        default_value,
+        range,
+    } = node;
     let context = folder.will_map_user(&range);
 
     let name = Foldable::fold(name, folder)?;
+    let default_value = Foldable::fold(default_value, folder)?;
     let range = folder.map_user(range, context)?;
-    Ok(TypeParamParamSpec { name, range })
+    Ok(TypeParamParamSpec {
+        name,
+        default_value,
+        range,
+    })
 }
 impl<T, U> Foldable<T, U> for TypeParamTypeVarTuple<T> {
     type Mapped = TypeParamTypeVarTuple<U>;
@@ -2937,12 +2957,21 @@ pub fn fold_type_param_type_var_tuple<U, F: Fold<U> + ?Sized>(
     #[allow(unused)] folder: &mut F,
     node: TypeParamTypeVarTuple<U>,
 ) -> Result<TypeParamTypeVarTuple<F::TargetU>, F::Error> {
-    let TypeParamTypeVarTuple { name, range } = node;
+    let TypeParamTypeVarTuple {
+        name,
+        default_value,
+        range,
+    } = node;
     let context = folder.will_map_user(&range);
 
     let name = Foldable::fold(name, folder)?;
+    let default_value = Foldable::fold(default_value, folder)?;
     let range = folder.map_user(range, context)?;
-    Ok(TypeParamTypeVarTuple { name, range })
+    Ok(TypeParamTypeVarTuple {
+        name,
+        default_value,
+        range,
+    })
 }
 impl<T, U> Foldable<T, U> for ArgWithDefault<T> {
     type Mapped = ArgWithDefault<U>;
diff --git a/ast/src/gen/generic.rs b/ast/src/gen/generic.rs
index 5efe9c0..bcbea58 100644
--- a/ast/src/gen/generic.rs
+++ b/ast/src/gen/generic.rs
@@ -1,7 +1,8 @@
 // File automatically generated by ast/asdl_rs.py.
 
 use crate::text_size::TextRange;
-#[derive(Clone, Debug, PartialEq, is_macro::Is)]
+#[derive(Clone, Debug, PartialEq)]
+#[derive(is_macro::Is)]
 pub enum Ast<R = TextRange> {
     #[is(name = "module")]
     Mod(Mod<R>),
@@ -3131,11 +3132,12 @@ pub struct TypeParamTypeVar<R = TextRange> {
     pub range: R,
     pub name: Identifier,
     pub bound: Option<Box<Expr<R>>>,
+    pub default_value: Option<Box<Expr<R>>>,
 }
 
 impl<R> Node for TypeParamTypeVar<R> {
     const NAME: &'static str = "TypeVar";
-    const FIELD_NAMES: &'static [&'static str] = &["name", "bound"];
+    const FIELD_NAMES: &'static [&'static str] = &["name", "bound", "default_value"];
 }
 impl<R> From<TypeParamTypeVar<R>> for TypeParam<R> {
     fn from(payload: TypeParamTypeVar<R>) -> Self {
@@ -3153,11 +3155,12 @@ impl<R> From<TypeParamTypeVar<R>> for Ast<R> {
 pub struct TypeParamParamSpec<R = TextRange> {
     pub range: R,
     pub name: Identifier,
+    pub default_value: Option<Box<Expr<R>>>,
 }
 
 impl<R> Node for TypeParamParamSpec<R> {
     const NAME: &'static str = "ParamSpec";
-    const FIELD_NAMES: &'static [&'static str] = &["name"];
+    const FIELD_NAMES: &'static [&'static str] = &["name", "default_value"];
 }
 impl<R> From<TypeParamParamSpec<R>> for TypeParam<R> {
     fn from(payload: TypeParamParamSpec<R>) -> Self {
@@ -3175,11 +3178,12 @@ impl<R> From<TypeParamParamSpec<R>> for Ast<R> {
 pub struct TypeParamTypeVarTuple<R = TextRange> {
     pub range: R,
     pub name: Identifier,
+    pub default_value: Option<Box<Expr<R>>>,
 }
 
 impl<R> Node for TypeParamTypeVarTuple<R> {
     const NAME: &'static str = "TypeVarTuple";
-    const FIELD_NAMES: &'static [&'static str] = &["name"];
+    const FIELD_NAMES: &'static [&'static str] = &["name", "default_value"];
 }
 impl<R> From<TypeParamTypeVarTuple<R>> for TypeParam<R> {
     fn from(payload: TypeParamTypeVarTuple<R>) -> Self {
diff --git a/ast/src/gen/visitor.rs b/ast/src/gen/visitor.rs
index d84e542..952e67c 100644
--- a/ast/src/gen/visitor.rs
+++ b/ast/src/gen/visitor.rs
@@ -853,13 +853,24 @@ pub trait Visitor<R = crate::text_size::TextRange> {
         if let Some(value) = node.bound {
             self.visit_expr(*value);
         }
+        if let Some(value) = node.default_value {
+            self.visit_expr(*value);
+        }
     }
     fn visit_type_param_param_spec(&mut self, node: TypeParamParamSpec<R>) {
         self.generic_visit_type_param_param_spec(node)
     }
-    fn generic_visit_type_param_param_spec(&mut self, node: TypeParamParamSpec<R>) {}
+    fn generic_visit_type_param_param_spec(&mut self, node: TypeParamParamSpec<R>) {
+        if let Some(value) = node.default_value {
+            self.visit_expr(*value);
+        }
+    }
     fn visit_type_param_type_var_tuple(&mut self, node: TypeParamTypeVarTuple<R>) {
         self.generic_visit_type_param_type_var_tuple(node)
     }
-    fn generic_visit_type_param_type_var_tuple(&mut self, node: TypeParamTypeVarTuple<R>) {}
+    fn generic_visit_type_param_type_var_tuple(&mut self, node: TypeParamTypeVarTuple<R>) {
+        if let Some(value) = node.default_value {
+            self.visit_expr(*value);
+        }
+    }
 }