diff --git a/2-resources/_External-learning-resources/00-Javascript/Object-oriented-programming-for-JavaScript/Module 1/Mastering JavaScript_Code/Chapter 9/async/package.json b/2-resources/_External-learning-resources/00-Javascript/Object-oriented-programming-for-JavaScript/Module 1/Mastering JavaScript_Code/Chapter 9/async/package.json
index 1143788b8..b48380384 100644
--- a/2-resources/_External-learning-resources/00-Javascript/Object-oriented-programming-for-JavaScript/Module 1/Mastering JavaScript_Code/Chapter 9/async/package.json	
+++ b/2-resources/_External-learning-resources/00-Javascript/Object-oriented-programming-for-JavaScript/Module 1/Mastering JavaScript_Code/Chapter 9/async/package.json	
@@ -38,7 +38,7 @@
     "karma-firefox-launcher": "^0.1.6",
     "karma-mocha": "^0.2.0",
     "karma-mocha-reporter": "^1.0.2",
-    "lodash": "^3.9.0",
+    "lodash": "^4.17.21",
     "mkdirp": "~0.5.1",
     "mocha": "^2.2.5",
     "native-promise-only": "^0.8.0-a",
diff --git a/2-resources/_External-learning-resources/01-Typescript/Learning-Typescript-2/Chapter02/modern-workflow-demo-master/package.json b/2-resources/_External-learning-resources/01-Typescript/Learning-Typescript-2/Chapter02/modern-workflow-demo-master/package.json
index 100280f3b..d34d53987 100644
--- a/2-resources/_External-learning-resources/01-Typescript/Learning-Typescript-2/Chapter02/modern-workflow-demo-master/package.json
+++ b/2-resources/_External-learning-resources/01-Typescript/Learning-Typescript-2/Chapter02/modern-workflow-demo-master/package.json
@@ -29,7 +29,7 @@
   "dependencies": {
     "bluebird": "^2.9.14",
     "handlebars": "^3.0.0",
-    "lodash": "^3.5.0"
+    "lodash": "^4.17.21"
   },
   "devDependencies": {
     "browser-sync": "^2.2.2",
diff --git a/2-resources/_External-learning-resources/01-Typescript/LearningTypeScript/chapters/chapter_15/package.json b/2-resources/_External-learning-resources/01-Typescript/LearningTypeScript/chapters/chapter_15/package.json
index 960dc6475..4ed711106 100644
--- a/2-resources/_External-learning-resources/01-Typescript/LearningTypeScript/chapters/chapter_15/package.json
+++ b/2-resources/_External-learning-resources/01-Typescript/LearningTypeScript/chapters/chapter_15/package.json
@@ -14,7 +14,7 @@
     "@types/node": "9.4.0",
     "@types/request": "2.47.0",
     "chalk": "2.3.0",
-    "lodash": "4.17.4",
+    "lodash": "4.17.21",
     "request": "2.83.0",
     "save": "2.3.2",
     "ts-simple-ast": "10.3.0",