chart.js 2.9.4 replaced to ^3.9.1. Chart.js 2.9.4 causes a bug in our recommender engine

package.json

@@ -70,7 +70,7 @@
     "angular2-chartjs": "0.4.1",
     "apexcharts": "3.33.0",
     "bootstrap": "4.3.1",
-    "chart.js": "^2.9.4",
+    "chart.js": "^3.9.1",
     "chartjs-plugin-zoom": "^0.7.7",
     "ckeditor": "4.7.3",
     "classlist.js": "1.1.20150312",