diff --git a/DESCRIPTION b/DESCRIPTION
index b5787c3..72ab83e 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -28,10 +28,9 @@ Suggests:
     testthat (>= 3.0.0),
     knitr,
     rmarkdown,
-    bookdown,
     ashr,
     MASS
-VignetteBuilder: knitr, bookdown
+VignetteBuilder: knitr
 Roxygen: list(markdown = TRUE)
 Config/testthat/edition: 3
 License: MIT + file LICENSE
diff --git a/vignettes/Input_Data_Format.Rmd b/vignettes/Input_Data_Format.Rmd
index e652281..370fb80 100644
--- a/vignettes/Input_Data_Format.Rmd
+++ b/vignettes/Input_Data_Format.Rmd
@@ -1,12 +1,6 @@
 ---
 title: "Input Data Format"
-output: 
-  bookdown::html_document2:
-    # base_format: rmarkdown::html_vignette
-    toc: true
-    toc_depth: 2
-    number_sections: true
-    fig_caption: true
+output: rmarkdown::html_vignette
 vignette: >
   %\VignetteIndexEntry{Input Data Format}
   %\VignetteEngine{knitr::rmarkdown}