diff --git a/js/d3/D3.js_4.x_Data_Visualization/Chapters/1/package-lock.json b/js/d3/D3.js_4.x_Data_Visualization/Chapters/1/package-lock.json
index 846d6fd..afa3ddd 100644
--- a/js/d3/D3.js_4.x_Data_Visualization/Chapters/1/package-lock.json
+++ b/js/d3/D3.js_4.x_Data_Visualization/Chapters/1/package-lock.json
@@ -165,7 +165,8 @@
       }
     },
     "@types/d3-sankey": {
-      "version": "github:aendrew/d3-sankey#81c5a27547c064f094de17b9df9e77c47e42fc8d"
+      "version": "github:aendrew/d3-sankey#81c5a27547c064f094de17b9df9e77c47e42fc8d",
+      "from": "github:aendrew/d3-sankey#81c5a27547c064f094de17b9df9e77c47e42fc8d"
     },
     "@types/d3-scale": {
       "version": "1.0.11",
@@ -549,11 +550,11 @@
       "integrity": "sha1-g+9cqGCysy5KDe7e6MdxudtXRx4="
     },
     "axios": {
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-      "resolved": "https://registry.npmjs.org/axios/-/axios-0.15.3.tgz",
-      "integrity": "sha1-LJ1jiy4ZGgjqHWzJiOrda6W9wFM=",
+      "version": "0.21.1",
+      "resolved": "https://registry.npmjs.org/axios/-/axios-0.21.1.tgz",
+      "integrity": "sha512-dKQiRHxGD9PPRIUNIWvZhPTPpl1rf/OxTYKsqKUDjBwYylTvV7SjSHJb9ratfyzM6wCdLCOYLzs73qpg5c4iGA==",
       "requires": {
-        "follow-redirects": "1.0.0"
+        "follow-redirects": "^1.10.0"
       }
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@@ -3963,12 +3964,9 @@
       "dev": true
     },
     "follow-redirects": {
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-      "resolved": "https://registry.npmjs.org/follow-redirects/-/follow-redirects-1.0.0.tgz",
-      "integrity": "sha1-jjQpjL0uF28lTv/sdaHHjMhJ/Tc=",
-      "requires": {
-        "debug": "2.6.9"
-      }
+      "version": "1.13.1",
+      "resolved": "https://registry.npmjs.org/follow-redirects/-/follow-redirects-1.13.1.tgz",
+      "integrity": "sha512-SSG5xmZh1mkPGyKzjZP8zLjltIfpW32Y5QpdNJyjcfGxK3qo3NDDkZOZSFiGn1A6SclQxY9GzEwAHQ3dmYRWpg=="
     },
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       "version": "1.0.2",
@@ -4052,7 +4050,8 @@
         },
         "ansi-regex": {
           "version": "2.1.1",
-          "bundled": true
+          "bundled": true,
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@@ -4095,7 +4094,8 @@
         },
         "balanced-match": {
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-          "bundled": true
+          "bundled": true,
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@@ -4108,6 +4108,7 @@
         "block-stream": {
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           "bundled": true,
+          "optional": true,
           "requires": {
             "inherits": "2.0.3"
           }
@@ -4115,6 +4116,7 @@
         "boom": {
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           "bundled": true,
+          "optional": true,
           "requires": {
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           }
@@ -4122,6 +4124,7 @@
         "brace-expansion": {
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           "bundled": true,
+          "optional": true,
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@@ -4129,7 +4132,8 @@
         },
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-          "bundled": true
+          "bundled": true,
+          "optional": true
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           "version": "0.12.0",
@@ -4143,30 +4147,36 @@
         },
         "code-point-at": {
           "version": "1.1.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
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         "combined-stream": {
           "version": "1.0.5",
           "bundled": true,
+          "optional": true,
           "requires": {
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           }
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         "concat-map": {
           "version": "0.0.1",
-          "bundled": true
+          "bundled": true,
+          "optional": true
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         "console-control-strings": {
           "version": "1.1.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
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         "core-util-is": {
           "version": "1.0.2",
-          "bundled": true
+          "bundled": true,
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         "cryptiles": {
           "version": "2.0.5",
           "bundled": true,
+          "optional": true,
           "requires": {
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           }
@@ -4201,7 +4211,8 @@
         },
         "delayed-stream": {
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-          "bundled": true
+          "bundled": true,
+          "optional": true
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           "version": "1.0.0",
@@ -4228,7 +4239,8 @@
         },
         "extsprintf": {
           "version": "1.0.2",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "forever-agent": {
           "version": "0.6.1",
@@ -4247,11 +4259,13 @@
         },
         "fs.realpath": {
           "version": "1.0.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "fstream": {
           "version": "1.0.11",
           "bundled": true,
+          "optional": true,
           "requires": {
             "graceful-fs": "4.1.11",
             "inherits": "2.0.3",
@@ -4302,6 +4316,7 @@
         "glob": {
           "version": "7.1.2",
           "bundled": true,
+          "optional": true,
           "requires": {
             "fs.realpath": "1.0.0",
             "inflight": "1.0.6",
@@ -4313,7 +4328,8 @@
         },
         "graceful-fs": {
           "version": "4.1.11",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "har-schema": {
           "version": "1.0.5",
@@ -4337,6 +4353,7 @@
         "hawk": {
           "version": "3.1.3",
           "bundled": true,
+          "optional": true,
           "requires": {
             "boom": "2.10.1",
             "cryptiles": "2.0.5",
@@ -4346,7 +4363,8 @@
         },
         "hoek": {
           "version": "2.16.3",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "http-signature": {
           "version": "1.1.1",
@@ -4361,6 +4379,7 @@
         "inflight": {
           "version": "1.0.6",
           "bundled": true,
+          "optional": true,
           "requires": {
             "once": "1.4.0",
             "wrappy": "1.0.2"
@@ -4368,7 +4387,8 @@
         },
         "inherits": {
           "version": "2.0.3",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "ini": {
           "version": "1.3.4",
@@ -4378,6 +4398,7 @@
         "is-fullwidth-code-point": {
           "version": "1.0.0",
           "bundled": true,
+          "optional": true,
           "requires": {
             "number-is-nan": "1.0.1"
           }
@@ -4389,7 +4410,8 @@
         },
         "isarray": {
           "version": "1.0.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "isstream": {
           "version": "0.1.2",
@@ -4452,11 +4474,13 @@
         },
         "mime-db": {
           "version": "1.27.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "mime-types": {
           "version": "2.1.15",
           "bundled": true,
+          "optional": true,
           "requires": {
             "mime-db": "1.27.0"
           }
@@ -4464,17 +4488,20 @@
         "minimatch": {
           "version": "3.0.4",
           "bundled": true,
+          "optional": true,
           "requires": {
             "brace-expansion": "1.1.7"
           }
         },
         "minimist": {
           "version": "0.0.8",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "mkdirp": {
           "version": "0.5.1",
           "bundled": true,
+          "optional": true,
           "requires": {
             "minimist": "0.0.8"
           }
@@ -4524,7 +4551,8 @@
         },
         "number-is-nan": {
           "version": "1.0.1",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "oauth-sign": {
           "version": "0.8.2",
@@ -4539,6 +4567,7 @@
         "once": {
           "version": "1.4.0",
           "bundled": true,
+          "optional": true,
           "requires": {
             "wrappy": "1.0.2"
           }
@@ -4564,7 +4593,8 @@
         },
         "path-is-absolute": {
           "version": "1.0.1",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "performance-now": {
           "version": "0.2.0",
@@ -4573,7 +4603,8 @@
         },
         "process-nextick-args": {
           "version": "1.0.7",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "punycode": {
           "version": "1.4.1",
@@ -4606,6 +4637,7 @@
         "readable-stream": {
           "version": "2.2.9",
           "bundled": true,
+          "optional": true,
           "requires": {
             "buffer-shims": "1.0.0",
             "core-util-is": "1.0.2",
@@ -4648,13 +4680,15 @@
         "rimraf": {
           "version": "2.6.1",
           "bundled": true,
+          "optional": true,
           "requires": {
             "glob": "7.1.2"
           }
         },
         "safe-buffer": {
           "version": "5.0.1",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "semver": {
           "version": "5.3.0",
@@ -4674,6 +4708,7 @@
         "sntp": {
           "version": "1.0.9",
           "bundled": true,
+          "optional": true,
           "requires": {
             "hoek": "2.16.3"
           }
@@ -4704,6 +4739,7 @@
         "string-width": {
           "version": "1.0.2",
           "bundled": true,
+          "optional": true,
           "requires": {
             "code-point-at": "1.1.0",
             "is-fullwidth-code-point": "1.0.0",
@@ -4713,6 +4749,7 @@
         "string_decoder": {
           "version": "1.0.1",
           "bundled": true,
+          "optional": true,
           "requires": {
             "safe-buffer": "5.0.1"
           }
@@ -4725,6 +4762,7 @@
         "strip-ansi": {
           "version": "3.0.1",
           "bundled": true,
+          "optional": true,
           "requires": {
             "ansi-regex": "2.1.1"
           }
@@ -4737,6 +4775,7 @@
         "tar": {
           "version": "2.2.1",
           "bundled": true,
+          "optional": true,
           "requires": {
             "block-stream": "0.0.9",
             "fstream": "1.0.11",
@@ -4786,7 +4825,8 @@
         },
         "util-deprecate": {
           "version": "1.0.2",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "uuid": {
           "version": "3.0.1",
@@ -4811,7 +4851,8 @@
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         "wrappy": {
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-          "bundled": true
+          "bundled": true,
+          "optional": true
         }
       }
     },
diff --git a/js/d3/D3.js_4.x_Data_Visualization/Chapters/1/package.json b/js/d3/D3.js_4.x_Data_Visualization/Chapters/1/package.json
index f8d7025..b1c57d9 100644
--- a/js/d3/D3.js_4.x_Data_Visualization/Chapters/1/package.json
+++ b/js/d3/D3.js_4.x_Data_Visualization/Chapters/1/package.json
@@ -55,7 +55,7 @@
     "@types/d3-sankey": "github:aendrew/d3-sankey",
     "@types/lodash": "^4.14.62",
     "@types/node": "^7.0.5",
-    "axios": "^0.15.3",
+    "axios": "^0.21.1",
     "babel-preset-env": "^1.6.1",
     "canvas-prebuilt": "^1.6.0",
     "d3": "^4.8.0",