diff --git a/solution-code-2019-april/package-lock.json b/solution-code-2019-april/package-lock.json
index 3ed1789..89b0a63 100644
--- a/solution-code-2019-april/package-lock.json
+++ b/solution-code-2019-april/package-lock.json
@@ -5206,9 +5206,9 @@
       "integrity": "sha512-Dc381HFWJzEOhQ+d8pkNon++bk9h6cdAoAj4iE6Q4y6xgTzySWXlKn05/TVNpjnfRqi/X0EpJEJohPjNI3zpVA=="
     },
     "eventsource": {
-      "version": "1.0.7",
-      "resolved": "https://registry.npmjs.org/eventsource/-/eventsource-1.0.7.tgz",
-      "integrity": "sha512-4Ln17+vVT0k8aWq+t/bF5arcS3EpT9gYtW66EPacdj/mAFevznsnyoHLPy2BA8gbIQeIHoPsvwmfBftfcG//BQ==",
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/eventsource/-/eventsource-1.1.1.tgz",
+      "integrity": "sha512-qV5ZC0h7jYIAOhArFJgSfdyz6rALJyb270714o7ZtNnw2WSJ+eexhKtE0O8LYPRsHZHf2osHKZBxGPvm3kPkCA==",
       "requires": {
         "original": "^1.0.0"
       }
diff --git a/solution-code-2019-april/yarn.lock b/solution-code-2019-april/yarn.lock
index 264a0a2..00fc881 100644
--- a/solution-code-2019-april/yarn.lock
+++ b/solution-code-2019-april/yarn.lock
@@ -3170,8 +3170,8 @@ events@^1.0.0:
   resolved "https://registry.yarnpkg.com/events/-/events-1.1.1.tgz#9ebdb7635ad099c70dcc4c2a1f5004288e8bd924"
 
 eventsource@^1.0.7:
-  version "1.0.7"
-  resolved "https://registry.yarnpkg.com/eventsource/-/eventsource-1.0.7.tgz#8fbc72c93fcd34088090bc0a4e64f4b5cee6d8d0"
+  version "1.1.1"
+  resolved "https://registry.yarnpkg.com/eventsource/-/eventsource-1.1.1.tgz#4544a35a57d7120fba4fa4c86cb4023b2c09df2f"
   dependencies:
     original "^1.0.0"
 
@@ -6904,9 +6904,9 @@ querystring@0.2.0:
   version "0.2.0"
   resolved "https://registry.yarnpkg.com/querystring/-/querystring-0.2.0.tgz#b209849203bb25df820da756e747005878521620"
 
-querystringify@^2.0.0:
-  version "2.1.0"
-  resolved "https://registry.yarnpkg.com/querystringify/-/querystringify-2.1.0.tgz#7ded8dfbf7879dcc60d0a644ac6754b283ad17ef"
+querystringify@^2.1.1:
+  version "2.2.0"
+  resolved "https://registry.yarnpkg.com/querystringify/-/querystringify-2.2.0.tgz#3345941b4153cb9d082d8eee4cda2016a9aef7f6"
 
 raf@3.4.1:
   version "3.4.1"
@@ -6996,14 +6996,14 @@ react-dev-utils@^7.0.3:
     strip-ansi "5.0.0"
     text-table "0.2.0"
 
-react-dom@16.8.2:
-  version "16.8.2"
-  resolved "https://registry.yarnpkg.com/react-dom/-/react-dom-16.8.2.tgz#7c8a69545dd554d45d66442230ba04a6a0a3c3d3"
+react-dom@^16.8.2:
+  version "16.14.0"
+  resolved "https://registry.yarnpkg.com/react-dom/-/react-dom-16.14.0.tgz#7ad838ec29a777fb3c75c3a190f661cf92ab8b89"
   dependencies:
     loose-envify "^1.1.0"
     object-assign "^4.1.1"
     prop-types "^15.6.2"
-    scheduler "^0.13.2"
+    scheduler "^0.19.1"
 
 react-error-overlay@^5.1.3:
   version "5.1.3"
@@ -7063,14 +7063,13 @@ react-scripts@2.1.5:
   optionalDependencies:
     fsevents "1.2.4"
 
-react@16.8.2:
-  version "16.8.2"
-  resolved "https://registry.yarnpkg.com/react/-/react-16.8.2.tgz#83064596feaa98d9c2857c4deae1848b542c9c0c"
+react@^16.8.2:
+  version "16.14.0"
+  resolved "https://registry.yarnpkg.com/react/-/react-16.14.0.tgz#94d776ddd0aaa37da3eda8fc5b6b18a4c9a3114d"
   dependencies:
     loose-envify "^1.1.0"
     object-assign "^4.1.1"
     prop-types "^15.6.2"
-    scheduler "^0.13.2"
 
 read-pkg-up@^1.0.1:
   version "1.0.1"
@@ -7466,9 +7465,9 @@ sax@^1.2.4, sax@~1.2.4:
   version "1.2.4"
   resolved "https://registry.yarnpkg.com/sax/-/sax-1.2.4.tgz#2816234e2378bddc4e5354fab5caa895df7100d9"
 
-scheduler@^0.13.2:
-  version "0.13.2"
-  resolved "https://registry.yarnpkg.com/scheduler/-/scheduler-0.13.2.tgz#969eaee2764a51d2e97b20a60963b2546beff8fa"
+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"
@@ -8359,10 +8358,10 @@ url-loader@1.1.2:
     schema-utils "^1.0.0"
 
 url-parse@^1.4.3:
-  version "1.4.3"
-  resolved "https://registry.yarnpkg.com/url-parse/-/url-parse-1.4.3.tgz#bfaee455c889023219d757e045fa6a684ec36c15"
+  version "1.5.10"
+  resolved "https://registry.yarnpkg.com/url-parse/-/url-parse-1.5.10.tgz#9d3c2f736c1d75dd3bd2be507dcc111f1e2ea9c1"
   dependencies:
-    querystringify "^2.0.0"
+    querystringify "^2.1.1"
     requires-port "^1.0.0"
 
 url@^0.11.0: