diff --git a/_pkgdown.yml b/_pkgdown.yml
index 7dd138ee..6cf0d971 100644
--- a/_pkgdown.yml
+++ b/_pkgdown.yml
@@ -1,4 +1,6 @@
 url: https://shikokuchuo.net/ichimoku/
+template:
+  bootstrap: 5
 navbar:
   right:
   - icon: fa-github