diff --git a/src/class_book/class_book_lesson_past.rs b/src/class_book/class_book_lesson_past.rs
index c022d66..c50a512 100644
--- a/src/class_book/class_book_lesson_past.rs
+++ b/src/class_book/class_book_lesson_past.rs
@@ -1,3 +1,7 @@
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(rename_all = "PascalCase")]
 pub struct ClassBookLessonPast {
     pub lesson_id: String,
     pub last_theme: Option<String>,
diff --git a/src/class_book/class_book_lesson_tag.rs b/src/class_book/class_book_lesson_tag.rs
index bed8ec0..2a42fcc 100644
--- a/src/class_book/class_book_lesson_tag.rs
+++ b/src/class_book/class_book_lesson_tag.rs
@@ -1,3 +1,7 @@
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(rename_all = "PascalCase")]
 pub struct ClassBookLessonTag {
     pub id: String,
     pub notice: String,