diff --git a/intro-react-v5/package.json b/intro-react-v5/package.json
index 5cd7ea4..25c4ea5 100644
--- a/intro-react-v5/package.json
+++ b/intro-react-v5/package.json
@@ -31,7 +31,7 @@
     "@frontendmasters/pet": "^1.0.3",
     "@reach/router": "^1.3.4",
     "react": "16.4.0",
-    "react-dom": "16.4.0"
+    "react-dom": "16.4.2"
   },
   "alias": {
     "components": "./src/components",
diff --git a/intro-react-v5/yarn.lock b/intro-react-v5/yarn.lock
index fa35a63..7cb2809 100644
--- a/intro-react-v5/yarn.lock
+++ b/intro-react-v5/yarn.lock
@@ -5256,10 +5256,10 @@ range-parser@~1.2.1:
   resolved "https://registry.yarnpkg.com/range-parser/-/range-parser-1.2.1.tgz#3cf37023d199e1c24d1a55b84800c2f3e6468031"
   integrity sha512-Hrgsx+orqoygnmhFbKaHE6c296J+HTAQXoxEF6gNupROmmGJRoyzfG3ccAveqCBrwr/2yxQ5BVd/GTl5agOwSg==
 
-react-dom@16.4.0:
-  version "16.4.0"
-  resolved "https://registry.yarnpkg.com/react-dom/-/react-dom-16.4.0.tgz#099f067dd5827ce36a29eaf9a6cdc7cbf6216b1e"
-  integrity sha512-bbLd+HYpBEnYoNyxDe9XpSG2t9wypMohwQPvKw8Hov3nF7SJiJIgK56b46zHpBUpHb06a1iEuw7G3rbrsnNL6w==
+react-dom@16.4.2:
+  version "16.4.2"
+  resolved "https://registry.yarnpkg.com/react-dom/-/react-dom-16.4.2.tgz#4afed569689f2c561d2b8da0b819669c38a0bda4"
+  integrity sha512-Usl73nQqzvmJN+89r97zmeUpQDKDlh58eX6Hbs/ERdDHzeBzWy+ENk7fsGQ+5KxArV1iOFPT46/VneklK9zoWw==
   dependencies:
     fbjs "^0.8.16"
     loose-envify "^1.1.0"