diff --git a/package-lock.json b/package-lock.json
index b1def5f5..59c4a083 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -783,12 +783,11 @@
     },
 
     "event-stream": {
-      "version": "3.3.6",
-      "resolved": "https://registry.npmjs.org/event-stream/-/event-stream-3.3.6.tgz",
-      "integrity": "sha512-dGXNg4F/FgVzlApjzItL+7naHutA3fDqbV/zAZqDDlXTjiMnQmZKu+prImWKszeBM5UQeGvAl3u1wBiKeDh61g==",
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/event-stream/-/event-stream-4.0.1.tgz",
+      "integrity": "sha512-qACXdu/9VHPBzcyhdOWR5/IahhGMf0roTeZJfzz077GwylcDd90yOHLouhmv7GJ5XzPi6ekaQWd8AvPP2nOvpA==",
       "requires": {
         "duplexer": "^0.1.1",
-  
         "from": "^0.1.7",
         "map-stream": "0.0.7",
         "pause-stream": "^0.0.11",
@@ -1601,6 +1600,32 @@
         "ipaddr.js": "1.8.0"
       }
     },
+
+    "ps-tree": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/ps-tree/-/ps-tree-1.1.0.tgz",
+      "integrity": "sha1-tCGyQUDWID8e08dplrRCewjowBQ=",
+      "requires": {
+        "event-stream": "~3.3.0"
+      },
+      "dependencies": {
+        "event-stream": {
+          "version": "3.3.5",
+          "resolved": "https://registry.npmjs.org/event-stream/-/event-stream-3.3.5.tgz",
+          "integrity": "sha512-vyibDcu5JL20Me1fP734QBH/kenBGLZap2n0+XXM7mvuUPzJ20Ydqj1aKcIeMdri1p+PU+4yAKugjN8KCVst+g==",
+          "requires": {
+            "duplexer": "^0.1.1",
+            "from": "^0.1.7",
+            "map-stream": "0.0.7",
+            "pause-stream": "^0.0.11",
+            "split": "^1.0.1",
+            "stream-combiner": "^0.2.2",
+            "through": "^2.3.8"
+          }
+        }
+      }
+    },
+
     "qs": {
       "version": "6.5.2",
       "resolved": "https://registry.npmjs.org/qs/-/qs-6.5.2.tgz",
diff --git a/package.json b/package.json
index 29dff2ce..0a2ee7e4 100644
--- a/package.json
+++ b/package.json
@@ -10,6 +10,7 @@
     "concurrently": "^4.0.1",
     "cookie-parser": "^1.4.3",
     "ellipsize": "^0.1.0",
+    "event-stream": "^4.0.1",
     "express": "^4.16.3",
     "express-session": "^1.15.6",
     "history": "^4.7.2",