diff --git a/README.md b/README.md
index f16ab3d..ba9186d 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,7 @@
 > R Htmlwidgets for [TOAST UI](https://ui.toast.com/) JavaScript libraries: [Grid](https://ui.toast.com/tui-grid/), [Calendar](https://ui.toast.com/tui-calendar/) and [Chart](https://ui.toast.com/tui-chart/).
 
 <!-- badges: start -->
-[![version](http://www.r-pkg.org/badges/version/toastui)](https://CRAN.R-project.org/package=toastui)
+[![version](https://www.r-pkg.org/badges/version/toastui)](https://CRAN.R-project.org/package=toastui)
 [![Lifecycle: experimental](https://img.shields.io/badge/lifecycle-experimental-orange.svg)](https://lifecycle.r-lib.org/articles/stages.html#experimental)
 [![R-CMD-check](https://github.com/dreamRs/toastui/actions/workflows/R-CMD-check.yaml/badge.svg)](https://github.com/dreamRs/toastui/actions/workflows/R-CMD-check.yaml)
 <!-- badges: end -->