diff --git a/ploneconf2020-grace_under_fire/package-lock.json b/ploneconf2020-grace_under_fire/package-lock.json
index 020042a..0889a60 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": {
@@ -5951,9 +5951,9 @@
       "dev": true
     },
     "postcss": {
-      "version": "7.0.27",
-      "resolved": "https://registry.npmjs.org/postcss/-/postcss-7.0.27.tgz",
-      "integrity": "sha512-WuQETPMcW9Uf1/22HWUWP9lgsIC+KEHg2kozMflKjbeUtw9ujvFX6QmIfozaErDkmLWS9WEnEdEe6Uo9/BNTdQ==",
+      "version": "7.0.36",
+      "resolved": "https://registry.npmjs.org/postcss/-/postcss-7.0.36.tgz",
+      "integrity": "sha512-BebJSIUMwJHRH0HAQoxN4u1CN86glsrwsW0q7T+/m44eXOUAxSNdHRkNZPYz5vVUbg17hFgOQDE7fZk7li3pZw==",
       "dev": true,
       "requires": {
         "chalk": "^2.4.2",