diff --git a/vignettes/bayestestR.Rmd b/vignettes/bayestestR.Rmd
index b755f4ca0..fe351ac4c 100644
--- a/vignettes/bayestestR.Rmd
+++ b/vignettes/bayestestR.Rmd
@@ -18,7 +18,8 @@ knitr::opts_chunk$set(
   message = FALSE
 )
 
-if (!requireNamespace("bayestestR", quietly = TRUE) ||
+if (requireNamespace("bayestestR", quietly = TRUE) ||
+  !requireNamespace("httr", quietly = TRUE) || # needed for `insight::download_model()`
   !requireNamespace("rstanarm", quietly = TRUE) ||
   !requireNamespace("ggplot2", quietly = TRUE) ||
   !requireNamespace("brms", quietly = TRUE) ||
diff --git a/vignettes/parameters.Rmd b/vignettes/parameters.Rmd
index c8296ce90..78ef25d1e 100644
--- a/vignettes/parameters.Rmd
+++ b/vignettes/parameters.Rmd
@@ -22,7 +22,7 @@ knitr::opts_chunk$set(
 if (!requireNamespace("factoextra", quietly = TRUE) ||
   !requireNamespace("NbClust", quietly = TRUE) ||
   !requireNamespace("mclust", quietly = TRUE) ||
-  !requireNamespace("httr", quietly = TRUE) ||
+  !requireNamespace("httr", quietly = TRUE) || # needed for `insight::download_model()`
   !requireNamespace("glmmTMB", quietly = TRUE) ||
   !requireNamespace("lme4", quietly = TRUE) ||
   !requireNamespace("brms", quietly = TRUE) ||