diff --git a/quiz-app-mean/package-lock.json b/quiz-app-mean/package-lock.json
index f1c8600..ab1fd6f 100644
--- a/quiz-app-mean/package-lock.json
+++ b/quiz-app-mean/package-lock.json
@@ -13148,9 +13148,9 @@
       "dev": true
     },
     "tslib": {
-      "version": "2.2.0",
-      "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.2.0.tgz",
-      "integrity": "sha512-gS9GVHRU+RGn5KQM2rllAlR3dU6m7AcpJKdtH8gFvQiC4Otgk98XnmMU+nZenHt/+VhnBPWwgrJsyrdcw6i23w=="
+      "version": "2.3.1",
+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.3.1.tgz",
+      "integrity": "sha512-77EbyPPpMz+FRFRuAFlWMtmgUWGe9UOG2Z25NqCwiIjRhOf5iKGuzSe5P2w1laq+FkRy4p+PCuVkJSGkzTEKVw=="
     },
     "tslint": {
       "version": "6.1.3",
diff --git a/quiz-app-mean/package.json b/quiz-app-mean/package.json
index 9ab85d8..37d3f83 100644
--- a/quiz-app-mean/package.json
+++ b/quiz-app-mean/package.json
@@ -29,7 +29,7 @@
     "chart.js": "2.5.0",
     "hammerjs": "2.0.8",
     "rxjs": "6.6.7",
-    "tslib": "2.2.0",
+    "tslib": "2.3.1",
     "zone.js": "~0.11.3"
   },
   "devDependencies": {