diff --git a/packages/react-dev-utils/package.json b/packages/react-dev-utils/package.json
index 8adff62faa9..038ce6767a0 100644
--- a/packages/react-dev-utils/package.json
+++ b/packages/react-dev-utils/package.json
@@ -51,7 +51,7 @@
     "react-error-overlay": "^4.0.0",
     "recursive-readdir": "2.2.1",
     "shell-quote": "1.6.1",
-    "sockjs-client": "1.1.4",
+    "sockjs-client": "1.1.5",
     "strip-ansi": "3.0.1",
     "text-table": "0.2.0"
   },
diff --git a/packages/react-scripts/package.json b/packages/react-scripts/package.json
index 1886de22830..deacc18d05f 100644
--- a/packages/react-scripts/package.json
+++ b/packages/react-scripts/package.json
@@ -56,7 +56,7 @@
     "sw-precache-webpack-plugin": "0.11.4",
     "url-loader": "0.6.2",
     "webpack": "3.8.1",
-    "webpack-dev-server": "2.9.4",
+    "webpack-dev-server": "2.11.3",
     "webpack-manifest-plugin": "1.3.2",
     "whatwg-fetch": "2.0.3"
   },