diff --git a/Chapter08 and 09/mern-mediastream/package-lock.json b/Chapter08 and 09/mern-mediastream/package-lock.json
index 290b3bd..f86c586 100644
--- a/Chapter08 and 09/mern-mediastream/package-lock.json	
+++ b/Chapter08 and 09/mern-mediastream/package-lock.json	
@@ -3214,7 +3214,8 @@
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           "version": "2.1.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
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         "aproba": {
           "version": "1.2.0",
@@ -3235,12 +3236,14 @@
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           "version": "1.0.0",
           "bundled": true,
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+          "dev": true,
+          "optional": true
         },
         "brace-expansion": {
           "version": "1.1.11",
           "bundled": true,
           "dev": true,
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@@ -3255,17 +3258,20 @@
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           "version": "1.1.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "concat-map": {
           "version": "0.0.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
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         "console-control-strings": {
           "version": "1.1.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
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@@ -3382,7 +3388,8 @@
         "inherits": {
           "version": "2.0.3",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
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         "ini": {
           "version": "1.3.5",
@@ -3394,6 +3401,7 @@
           "version": "1.0.0",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
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           }
@@ -3408,19 +3416,23 @@
           "version": "3.0.4",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
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           }
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         "minimist": {
-          "version": "0.0.8",
-          "bundled": true,
-          "dev": true
+          "version": "1.2.0",
+          "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
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+          "dev": true,
+          "optional": true
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         "minipass": {
           "version": "2.2.4",
           "bundled": true,
           "dev": true,
+          "optional": true,
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             "yallist": "3.0.2"
@@ -3435,14 +3447,6 @@
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@@ -3519,7 +3523,8 @@
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           "version": "1.0.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
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           "version": "4.1.1",
@@ -3531,6 +3536,7 @@
           "version": "1.4.0",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
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@@ -3579,14 +3585,6 @@
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             "minimist": "1.2.0",
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@@ -3616,7 +3614,8 @@
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           "version": "5.1.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
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           "version": "2.1.2",
@@ -3652,6 +3651,7 @@
           "version": "1.0.2",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "code-point-at": "1.1.0",
             "is-fullwidth-code-point": "1.0.0",
@@ -3671,6 +3671,7 @@
           "version": "3.0.1",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
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@@ -3714,12 +3715,14 @@
         "wrappy": {
           "version": "1.0.2",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
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         "yallist": {
           "version": "3.0.2",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
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@@ -3837,26 +3840,26 @@
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       "dev": true,
       "requires": {
-        "glob": "7.1.2",
-        "yargs": "1.2.6"
+        "glob": "^7.0.5",
+        "yargs": "~1.2.6"
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           "dev": true,
           "requires": {
-            "minimist": "0.1.0"
+            "minimist": "^0.1.0"
           }
         }
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@@ -5315,7 +5318,7 @@
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         "onetime": {
           "version": "1.1.0",
-          "resolved": "http://registry.npmjs.org/onetime/-/onetime-1.1.0.tgz",
+          "resolved": "https://registry.npmjs.org/onetime/-/onetime-1.1.0.tgz",
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           "dev": true
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@@ -5505,7 +5508,7 @@
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         "onetime": {
           "version": "1.1.0",
-          "resolved": "http://registry.npmjs.org/onetime/-/onetime-1.1.0.tgz",
+          "resolved": "https://registry.npmjs.org/onetime/-/onetime-1.1.0.tgz",
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@@ -5838,7 +5841,7 @@
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-      "integrity": "sha1-hX/Kv8M5fSYluCKCYuhqp6ARsF0=",
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@@ -5883,7 +5886,7 @@
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       "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.1.tgz",
-      "integrity": "sha1-MAV0OOrGz3+MR2fzhkjWaX11yQM=",
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@@ -6383,7 +6386,7 @@
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-          "resolved": "http://registry.npmjs.org/onetime/-/onetime-1.1.0.tgz",
+          "resolved": "https://registry.npmjs.org/onetime/-/onetime-1.1.0.tgz",
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@@ -7044,7 +7047,7 @@
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-          "integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ=",
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@@ -9507,7 +9510,7 @@
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-          "integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ=",
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           "dev": true
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         "supports-color": {