diff --git a/flutter_readium/assets/_helper_scripts/package-lock.json b/flutter_readium/assets/_helper_scripts/package-lock.json
index 637e3921..d94ec647 100644
--- a/flutter_readium/assets/_helper_scripts/package-lock.json
+++ b/flutter_readium/assets/_helper_scripts/package-lock.json
@@ -5641,10 +5641,11 @@
       }
     },
     "node_modules/postcss-selector-parser": {
-      "version": "6.1.2",
-      "resolved": "https://registry.npmjs.org/postcss-selector-parser/-/postcss-selector-parser-6.1.2.tgz",
-      "integrity": "sha512-Q8qQfPiZ+THO/3ZrOrO0cJJKfpYCagtMUkXbnEfmgUjwXg6z/WBeOyS9APBBPCTSiDV+s4SwQGu8yFsiMRIudg==",
+      "version": "6.1.4",
+      "resolved": "https://registry.npmjs.org/postcss-selector-parser/-/postcss-selector-parser-6.1.4.tgz",
+      "integrity": "sha512-bIoJLOmjCO1S9XdY/DcnR5hJxvrDir1PbGChrzXG3vw0/FOliy/fA3dmdhQ441kah4gKv+TwckGzex6wNS5cnQ==",
       "dev": true,
+      "license": "MIT",
       "dependencies": {
         "cssesc": "^3.0.0",
         "util-deprecate": "^1.0.2"