diff --git a/app/src/main/java/com/example/citrusclient/rest/TodosRest.java b/app/src/main/java/com/example/citrusclient/rest/TodosRest.java
index 2e7cf82..88c6ad8 100644
--- a/app/src/main/java/com/example/citrusclient/rest/TodosRest.java
+++ b/app/src/main/java/com/example/citrusclient/rest/TodosRest.java
@@ -22,14 +22,14 @@
     @GET("/accounts/{account_id}/books/{book_id}/todos")
     Call<ArrayList<Todo>> getAllTodos(
             @Path("account_id") String accountId,
-            @Path("book_id") String bookId,
+            @Path("book_id") Integer bookId,
             @Query("token") String token
     );
 
     @GET("/accounts/{account_id}/books/{book_id}/todos/{year}/{month}")
     Call<ArrayList<Todo>> getTodosByMonth(
             @Path("account_id") String accountId,
-            @Path("book_id") String bookId,
+            @Path("book_id") Integer bookId,
             @Path("year") Integer year,
             @Path("month") Integer month,
             @Query("token") String token
@@ -38,7 +38,7 @@
     @GET("/accounts/{account_id}/books/{book_id}/todos/{year}/{month}/{day}")
     Call<ArrayList<Todo>> getTodosByDay(
             @Path("account_id") String accountId,
-            @Path("book_id") String bookId,
+            @Path("book_id") Integer bookId,
             @Path("year") Integer year,
             @Path("month") Integer month,
             @Path("day") Integer day,
@@ -48,7 +48,7 @@
     @GET("/accounts/{account_id}/books/{book_id}/todos/{year}/{month}/{day}/{todo_id}")
     Call<Todo> getTodoById(
             @Path("account_id") String accountId,
-            @Path("book_id") String bookId,
+            @Path("book_id") Integer bookId,
             @Path("year") Integer year,
             @Path("month") Integer month,
             @Path("day") Integer day,
@@ -60,7 +60,7 @@
     @POST("/accounts/{account_id}/books/{book_id}/todos/{year}/{month}/{day}")
     Call<Todo> createTodo(
             @Path("account_id") String accountId,
-            @Path("book_id") String bookId,
+            @Path("book_id") Integer bookId,
             @Path("year") Integer year,
             @Path("month") Integer month,
             @Path("day") Integer day,
@@ -71,7 +71,7 @@
     @PUT("/accounts/{account_id}/books/{book_id}/todos/{year}/{month}/{day}/{todo_id}/check")
     Call<Void> setCheck(
             @Path("account_id") String accountId,
-            @Path("book_id") String bookId,
+            @Path("book_id") Integer bookId,
             @Path("year") Integer year,
             @Path("month") Integer month,
             @Path("day") Integer day,
@@ -83,7 +83,7 @@
     @DELETE("/accounts/{account_id}/books/{book_id}/todos/{year}/{month}/{day}/{todo_id}")
     Call<Void> deleteTodoById(
             @Path("account_id") String accountId,
-            @Path("book_id") String bookId,
+            @Path("book_id") Integer bookId,
             @Path("year") Integer year,
             @Path("month") Integer month,
             @Path("day") Integer day,