diff --git a/package.json b/package.json
index 18555b5..436b0d8 100644
--- a/package.json
+++ b/package.json
@@ -79,6 +79,7 @@
         "mapbbcode": "MapBBCode/mapbbcode#v1.2.0",
         "maplibre-gl": "^2.1.9",
         "overpass-layer": "3.1.1",
+        "popper.js": "1.16.1",
         "regenerator-runtime": "0.13.9",
         "togpx": "nrenner/togpx#722d291",
         "tokml": "^0.4.0",
diff --git a/yarn.lock b/yarn.lock
index 1f2e9ed..ccd6101 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -10089,7 +10089,7 @@ polygon-clipping@^0.15.3:
   dependencies:
     splaytree "^3.1.0"
 
-popper.js@^1.16.0:
+popper.js@1.16.1, popper.js@^1.16.0:
   version "1.16.1"
   resolved "https://registry.yarnpkg.com/popper.js/-/popper.js-1.16.1.tgz#2a223cb3dc7b6213d740e40372be40de43e65b1b"
   integrity sha512-Wb4p1J4zyFTbM+u6WuO4XstYx4Ky9Cewe4DWrel7B0w6VVICvPwdOpotjzcf6eD8TsckVnIMNONQyPIUFOUbCQ==