diff --git a/serde_codegen/Cargo.toml b/serde_codegen/Cargo.toml
index 46b3ec8a..76a73e96 100644
--- a/serde_codegen/Cargo.toml
+++ b/serde_codegen/Cargo.toml
@@ -16,13 +16,13 @@ nightly-testing = ["clippy"]
 with-syntex = ["quasi/with-syntex", "quasi_codegen", "quasi_codegen/with-syntex", "syntex", "syntex_syntax"]
 
 [build-dependencies]
-quasi_codegen = { version = "^0.5.0", optional = true }
-syntex = { version = "^0.27.0", optional = true }
+quasi_codegen = { version = "^0.6.0", optional = true }
+syntex = { version = "^0.28.0", optional = true }
 
 [dependencies]
-aster = { version = "^0.11.0", default-features = false }
-clippy = { version = "^0.0.39", optional = true }
-quasi = { version = "^0.5.0", default-features = false }
-quasi_macros = { version = "^0.5.0", optional = true }
-syntex = { version = "^0.27.0", optional = true }
-syntex_syntax = { version = "^0.27.0", optional = true }
+aster = { version = "^0.12.0", default-features = false }
+clippy = { version = "^0.0.41", optional = true }
+quasi = { version = "^0.6.0", default-features = false }
+quasi_macros = { version = "^0.6.0", optional = true }
+syntex = { version = "^0.28.0", optional = true }
+syntex_syntax = { version = "^0.28.0", optional = true }
diff --git a/serde_codegen/src/de.rs b/serde_codegen/src/de.rs
index e1a2c0e1..8b37cff0 100644
--- a/serde_codegen/src/de.rs
+++ b/serde_codegen/src/de.rs
@@ -393,7 +393,7 @@ fn deserialize_seq(
     struct_path: ast::Path,
     fields: usize,
 ) -> P<ast::Expr> {
-    let let_values: Vec<P<ast::Stmt>> = (0 .. fields)
+    let let_values: Vec<ast::Stmt> = (0 .. fields)
         .map(|i| {
             let name = builder.id(format!("__field{}", i));
             quote_stmt!(cx,
@@ -427,7 +427,7 @@ fn deserialize_struct_as_seq(
     struct_path: ast::Path,
     fields: &[ast::StructField],
 ) -> Result<P<ast::Expr>, ()> {
-    let let_values: Vec<P<ast::Stmt>> = (0 .. fields.len())
+    let let_values: Vec<ast::Stmt> = (0 .. fields.len())
         .map(|i| {
             let name = builder.id(format!("__field{}", i));
             quote_stmt!(cx,
@@ -930,7 +930,7 @@ fn deserialize_struct_visitor(
     builder: &aster::AstBuilder,
     struct_path: ast::Path,
     fields: &[ast::StructField],
-) -> Result<(Vec<P<ast::Item>>, P<ast::Stmt>, P<ast::Expr>), ()> {
+) -> Result<(Vec<P<ast::Item>>, ast::Stmt, P<ast::Expr>), ()> {
     let field_visitor = deserialize_field_visitor(
         cx,
         builder,
@@ -977,7 +977,7 @@ fn deserialize_map(
         .collect();
 
     // Declare each field.
-    let let_values: Vec<P<ast::Stmt>> = field_names.iter()
+    let let_values: Vec<ast::Stmt> = field_names.iter()
         .map(|field_name| quote_stmt!(cx, let mut $field_name = None;).unwrap())
         .collect();
 
@@ -994,7 +994,7 @@ fn deserialize_map(
 
     let field_attrs = try!(field::struct_field_attrs(cx, builder, fields));
 
-    let extract_values: Vec<P<ast::Stmt>> = field_names.iter()
+    let extract_values: Vec<ast::Stmt> = field_names.iter()
         .zip(field_attrs.iter())
         .map(|(field_name, field_attr)| {
             let missing_expr = if field_attr.use_default() {