diff --git a/ploneconf2020-grace_under_fire/package-lock.json b/ploneconf2020-grace_under_fire/package-lock.json
index 020042a..e8248fc 100644
--- a/ploneconf2020-grace_under_fire/package-lock.json
+++ b/ploneconf2020-grace_under_fire/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "reveal.js",
-  "version": "4.0.2",
+  "version": "4.1.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -93,12 +93,6 @@
             "lodash": "^4.17.13",
             "to-fast-properties": "^2.0.0"
           }
-        },
-        "lodash": {
-          "version": "4.17.20",
-          "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.20.tgz",
-          "integrity": "sha512-PlhdFcillOINfeV7Ni6oF1TAEayyZBoZ8bcshTHqOYJYlrqzRK5hagpagky5o4HfCzzd1TRkXPMFq6cKk9rGmA==",
-          "dev": true
         }
       }
     },
@@ -5049,9 +5043,9 @@
       }
     },
     "lodash": {
-      "version": "4.17.20",
-      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.20.tgz",
-      "integrity": "sha512-PlhdFcillOINfeV7Ni6oF1TAEayyZBoZ8bcshTHqOYJYlrqzRK5hagpagky5o4HfCzzd1TRkXPMFq6cKk9rGmA==",
+      "version": "4.17.21",
+      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.21.tgz",
+      "integrity": "sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg==",
       "dev": true
     },
     "lodash._reinterpolate": {