diff --git a/javascript/reactjs/react-tutorial/hello-react/yarn.lock b/javascript/reactjs/react-tutorial/hello-react/yarn.lock
index 15e68d3..ca72ef9 100644
--- a/javascript/reactjs/react-tutorial/hello-react/yarn.lock
+++ b/javascript/reactjs/react-tutorial/hello-react/yarn.lock
@@ -1552,7 +1552,7 @@ compressible@~2.0.13:
 
 compression@^1.5.2:
   version "1.7.2"
-  resolved "http://registry.npmjs.org/compression/-/compression-1.7.2.tgz#aaffbcd6aaf854b44ebb280353d5ad1651f59a69"
+  resolved "https://registry.npmjs.org/compression/-/compression-1.7.2.tgz#aaffbcd6aaf854b44ebb280353d5ad1651f59a69"
   dependencies:
     accepts "~1.3.4"
     bytes "3.0.0"
@@ -3966,6 +3966,10 @@ js-tokens@^3.0.0, js-tokens@^3.0.2:
   version "3.0.2"
   resolved "https://registry.yarnpkg.com/js-tokens/-/js-tokens-3.0.2.tgz#9866df395102130e38f7f996bceb65443209c25b"
 
+"js-tokens@^3.0.0 || ^4.0.0":
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/js-tokens/-/js-tokens-4.0.0.tgz#19203fb59991df98e3a287050d4647cdeaf32499"
+
 js-yaml@^3.4.3, js-yaml@^3.7.0, js-yaml@^3.9.1:
   version "3.11.0"
   resolved "https://registry.yarnpkg.com/js-yaml/-/js-yaml-3.11.0.tgz#597c1a8bd57152f26d622ce4117851a51f5ebaef"
@@ -4247,6 +4251,12 @@ loose-envify@^1.0.0, loose-envify@^1.1.0, loose-envify@^1.3.1:
   dependencies:
     js-tokens "^3.0.0"
 
+loose-envify@^1.4.0:
+  version "1.4.0"
+  resolved "https://registry.yarnpkg.com/loose-envify/-/loose-envify-1.4.0.tgz#71ee51fa7be4caec1a63839f7e682d8132d30caf"
+  dependencies:
+    js-tokens "^3.0.0 || ^4.0.0"
+
 loud-rejection@^1.0.0:
   version "1.6.0"
   resolved "https://registry.yarnpkg.com/loud-rejection/-/loud-rejection-1.6.0.tgz#5b46f80147edee578870f086d04821cf998e551f"
@@ -4469,8 +4479,8 @@ minizlib@^1.1.0:
     minipass "^2.2.1"
 
 mixin-deep@^1.2.0:
-  version "1.3.1"
-  resolved "https://registry.yarnpkg.com/mixin-deep/-/mixin-deep-1.3.1.tgz#a49e7268dce1a0d9698e45326c5626df3543d0fe"
+  version "1.3.2"
+  resolved "https://registry.yarnpkg.com/mixin-deep/-/mixin-deep-1.3.2.tgz#1120b43dc359a785dce65b55b82e257ccf479566"
   dependencies:
     for-in "^1.0.2"
     is-extendable "^1.0.1"
@@ -5379,7 +5389,7 @@ promise@^7.1.1:
   dependencies:
     asap "~2.0.3"
 
-prop-types@^15.5.10, prop-types@^15.6.0:
+prop-types@^15.5.10:
   version "15.6.1"
   resolved "https://registry.yarnpkg.com/prop-types/-/prop-types-15.6.1.tgz#36644453564255ddda391191fb3a125cbdf654ca"
   dependencies:
@@ -5387,6 +5397,14 @@ prop-types@^15.5.10, prop-types@^15.6.0:
     loose-envify "^1.3.1"
     object-assign "^4.1.1"
 
+prop-types@^15.6.2:
+  version "15.7.2"
+  resolved "https://registry.yarnpkg.com/prop-types/-/prop-types-15.7.2.tgz#52c41e75b8c87e72b9d9360e0206b99dcbffa6c5"
+  dependencies:
+    loose-envify "^1.4.0"
+    object-assign "^4.1.1"
+    react-is "^16.8.1"
+
 proxy-addr@~2.0.3:
   version "2.0.3"
   resolved "https://registry.yarnpkg.com/proxy-addr/-/proxy-addr-2.0.3.tgz#355f262505a621646b3130a728eb647e22055341"
@@ -5527,19 +5545,23 @@ react-dev-utils@^5.0.1:
     strip-ansi "3.0.1"
     text-table "0.2.0"
 
-react-dom@16.3.2:
-  version "16.3.2"
-  resolved "https://registry.yarnpkg.com/react-dom/-/react-dom-16.3.2.tgz#cb90f107e09536d683d84ed5d4888e9640e0e4df"
+react-dom@^16.3.2:
+  version "16.13.1"
+  resolved "https://registry.yarnpkg.com/react-dom/-/react-dom-16.13.1.tgz#c1bd37331a0486c078ee54c4740720993b2e0e7f"
   dependencies:
-    fbjs "^0.8.16"
     loose-envify "^1.1.0"
     object-assign "^4.1.1"
-    prop-types "^15.6.0"
+    prop-types "^15.6.2"
+    scheduler "^0.19.1"
 
 react-error-overlay@^4.0.0:
   version "4.0.0"
   resolved "https://registry.yarnpkg.com/react-error-overlay/-/react-error-overlay-4.0.0.tgz#d198408a85b4070937a98667f500c832f86bd5d4"
 
+react-is@^16.8.1:
+  version "16.13.1"
+  resolved "https://registry.yarnpkg.com/react-is/-/react-is-16.13.1.tgz#789729a4dc36de2999dc156dd6c1d9c18cea56a4"
+
 react-scripts@1.1.4:
   version "1.1.4"
   resolved "https://registry.yarnpkg.com/react-scripts/-/react-scripts-1.1.4.tgz#d5c230e707918d6dd2d06f303b10f5222d017c88"
@@ -5585,14 +5607,13 @@ react-scripts@1.1.4:
   optionalDependencies:
     fsevents "^1.1.3"
 
-react@16.3.2:
-  version "16.3.2"
-  resolved "https://registry.yarnpkg.com/react/-/react-16.3.2.tgz#fdc8420398533a1e58872f59091b272ce2f91ea9"
+react@^16.3.2:
+  version "16.13.1"
+  resolved "https://registry.yarnpkg.com/react/-/react-16.13.1.tgz#2e818822f1a9743122c063d6410d85c1e3afe48e"
   dependencies:
-    fbjs "^0.8.16"
     loose-envify "^1.1.0"
     object-assign "^4.1.1"
-    prop-types "^15.6.0"
+    prop-types "^15.6.2"
 
 read-pkg-up@^1.0.1:
   version "1.0.1"
@@ -5950,6 +5971,13 @@ sax@^1.2.1, sax@^1.2.4, sax@~1.2.1:
   version "1.2.4"
   resolved "https://registry.yarnpkg.com/sax/-/sax-1.2.4.tgz#2816234e2378bddc4e5354fab5caa895df7100d9"
 
+scheduler@^0.19.1:
+  version "0.19.1"
+  resolved "https://registry.yarnpkg.com/scheduler/-/scheduler-0.19.1.tgz#4f3e2ed2c1a7d65681f4c854fa8c5a1ccb40f196"
+  dependencies:
+    loose-envify "^1.1.0"
+    object-assign "^4.1.1"
+
 schema-utils@^0.3.0:
   version "0.3.0"
   resolved "https://registry.yarnpkg.com/schema-utils/-/schema-utils-0.3.0.tgz#f5877222ce3e931edae039f17eb3716e7137f8cf"