diff --git a/_config.yml b/_config.yml
index 82a6b20835..fc1117e7d2 100644
--- a/_config.yml
+++ b/_config.yml
@@ -58,8 +58,8 @@ cdn:
   js_bundle_hash:   "sha384-xrRywqdh3PHs8keKZN+8zzc5TX0GRTLCcmivcbNJWm2rs5C8PRhcEn3czEjhAO9o"
   jquery:           "https://code.jquery.com/jquery-3.4.1.slim.min.js"
   jquery_hash:      "sha384-J6qa4849blE2+poT4WnyKhv5vZF5SrPo0iEjwBvKU7imGFAV0wwj1yYfoRSJoZ+n"
-  popper:           "https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.15.0/umd/popper.min.js"
-  popper_hash:      "sha384-L2pyEeut/H3mtgCBaUNw7KWzp5n9+4pDQiExs933/5QfaTh8YStYFFkOzSoXjlTb"
+  popper:           "https://cdn.jsdelivr.net/npm/popper.js@1.16.0/dist/umd/popper.min.js"
+  popper_hash:      "sha384-Q6E9RHvbIyZFJoft+2mJbHaEWldlvI9IOYy5n3zV9zzTtmI3UksdQRVvoxMfooAo"
 
 toc:
   min_level:        2