diff --git a/h5p-editor-php-library/package-lock.json b/h5p-editor-php-library/package-lock.json
index 7f97049..d3cdfcc 100644
--- a/h5p-editor-php-library/package-lock.json
+++ b/h5p-editor-php-library/package-lock.json
@@ -969,10 +969,11 @@
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-      "resolved": "https://registry.npmjs.org/immutable/-/immutable-4.3.5.tgz",
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-      "dev": true
+      "version": "4.3.8",
+      "resolved": "https://registry.npmjs.org/immutable/-/immutable-4.3.8.tgz",
+      "integrity": "sha512-d/Ld9aLbKpNwyl0KiM2CT1WYvkitQ1TSvmRtkcV8FKStiDoA7Slzgjmb/1G2yhKM1p0XeNOieaTbFZmU1d3Xuw==",
+      "dev": true,
+      "license": "MIT"
     },
     "node_modules/import-local": {
       "version": "3.1.0",