diff --git a/xlsx/src/import/tables.rs b/xlsx/src/import/tables.rs
index c0a019a..acc274f 100644
--- a/xlsx/src/import/tables.rs
+++ b/xlsx/src/import/tables.rs
@@ -112,7 +112,7 @@ pub(crate) fn load_table<R: Read + std::io::Seek>(
         .filter(|n| n.has_tag_name("autoFilter"))
         .collect::<Vec<Node>>();
 
-    let has_filters = if let Some(filter) = auto_filter.get(0) {
+    let has_filters = if let Some(filter) = auto_filter.first() {
         filter.children().count() > 0
     } else {
         false
@@ -179,7 +179,7 @@ pub(crate) fn load_table<R: Read + std::io::Seek>(
         .descendants()
         .filter(|n| n.has_tag_name("tableInfo"))
         .collect::<Vec<Node>>();
-    let style_info = match table_info.get(0) {
+    let style_info = match table_info.first() {
         Some(node) => {
             let name = node.attribute("name").map(|s| s.to_string());
             TableStyleInfo {
diff --git a/xlsx/src/import/worksheets.rs b/xlsx/src/import/worksheets.rs
index 0d476c8..819242c 100644
--- a/xlsx/src/import/worksheets.rs
+++ b/xlsx/src/import/worksheets.rs
@@ -10,7 +10,6 @@ use ironcalc_base::{
     types::{Cell, Col, Comment, DefinedName, Row, SheetData, SheetState, Table, Worksheet},
 };
 use roxmltree::Node;
-use serde::{Deserialize, Serialize};
 use thiserror::Error;
 
 use crate::error::XlsxError;
@@ -20,7 +19,6 @@ use super::{
     util::{get_attribute, get_color, get_number},
 };
 
-#[derive(Serialize, Deserialize)]
 pub(crate) struct Sheet {
     pub(crate) name: String,
     pub(crate) sheet_id: u32,
@@ -28,13 +26,11 @@ pub(crate) struct Sheet {
     pub(crate) state: SheetState,
 }
 
-#[derive(Serialize, Deserialize)]
 pub(crate) struct WorkbookXML {
     pub(crate) worksheets: Vec<Sheet>,
     pub(crate) defined_names: Vec<DefinedName>,
 }
 
-#[derive(Serialize, Deserialize)]
 pub(crate) struct Relationship {
     pub(crate) target: String,
     pub(crate) rel_type: String,