diff --git a/web/package-lock.json b/web/package-lock.json
index f87a1f300..e56dabacb 100644
--- a/web/package-lock.json
+++ b/web/package-lock.json
@@ -899,9 +899,9 @@
             "integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s="
         },
         "construct-style-sheets-polyfill": {
-            "version": "2.4.6",
-            "resolved": "https://registry.npmjs.org/construct-style-sheets-polyfill/-/construct-style-sheets-polyfill-2.4.6.tgz",
-            "integrity": "sha512-lU0to7dFDjKslMF+M5NUa4s0RQMBRVyZMXvD/vp7vmjdEPgziTkHSfZHQxfoIvVWajWRJUVJMLfrMwcx8fTh4A=="
+            "version": "2.4.9",
+            "resolved": "https://registry.npmjs.org/construct-style-sheets-polyfill/-/construct-style-sheets-polyfill-2.4.9.tgz",
+            "integrity": "sha512-kPXZXxsp7CTr/Vs29+omUA29wTrFplkdY6jqxyv0DDWC5Ro79WmwpboH2M9KiOclbtn8r81GCFtc7+t7OjRnCw=="
         },
         "copy-descriptor": {
             "version": "0.1.1",
diff --git a/web/package.json b/web/package.json
index 333f056d5..fd0fc3eb2 100644
--- a/web/package.json
+++ b/web/package.json
@@ -18,7 +18,7 @@
         "@types/codemirror": "0.0.108",
         "chart.js": "^2.9.4",
         "codemirror": "^5.59.2",
-        "construct-style-sheets-polyfill": "^2.4.6",
+        "construct-style-sheets-polyfill": "^2.4.9",
         "flowchart.js": "^1.15.0",
         "lit-element": "^2.4.0",
         "lit-html": "^1.3.0",