diff --git a/package-lock.json b/package-lock.json
index 5796362d..b988f234 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1166,18 +1166,18 @@
       "dev": true
     },
     "event-stream": {
-      "version": "4.0.1",
-      "resolved": "https://registry.npmjs.org/event-stream/-/event-stream-4.0.1.tgz",
-      "integrity": "sha512-qACXdu/9VHPBzcyhdOWR5/IahhGMf0roTeZJfzz077GwylcDd90yOHLouhmv7GJ5XzPi6ekaQWd8AvPP2nOvpA==",
+      "version": "3.3.4",
+      "resolved": "https://registry.npmjs.org/event-stream/-/event-stream-3.3.4.tgz",
+      "integrity": "sha1-SrTJoPWlTbkzi0w02Gv86PSzVXE=",
       "dev": true,
       "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"
+        "duplexer": "~0.1.1",
+        "from": "~0",
+        "map-stream": "~0.1.0",
+        "pause-stream": "0.0.11",
+        "split": "0.3",
+        "stream-combiner": "~0.0.4",
+        "through": "~2.3.1"
       }
     },
     "eventemitter3": {
@@ -2962,9 +2962,9 @@
       "dev": true
     },
     "map-stream": {
-      "version": "0.0.7",
-      "resolved": "https://registry.npmjs.org/map-stream/-/map-stream-0.0.7.tgz",
-      "integrity": "sha1-ih8HiW2CsQkmvTdEokIACfiJdKg=",
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/map-stream/-/map-stream-0.1.0.tgz",
+      "integrity": "sha1-5WqpTEyAVaFkBKBnS3jyFffI4ZQ=",
       "dev": true
     },
     "map-visit": {
@@ -4244,9 +4244,9 @@
       "dev": true
     },
     "split": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/split/-/split-1.0.1.tgz",
-      "integrity": "sha512-mTyOoPbrivtXnwnIxZRFYRrPNtEFKlpB2fvjSnCQUiAA6qAZzqwna5envK4uk6OIeP17CsdF3rSBGYVBsU0Tkg==",
+      "version": "0.3.3",
+      "resolved": "https://registry.npmjs.org/split/-/split-0.3.3.tgz",
+      "integrity": "sha1-zQ7qXmOiEd//frDwkcQTPi0N0o8=",
       "dev": true,
       "requires": {
         "through": "2"
@@ -4312,13 +4312,12 @@
       "dev": true
     },
     "stream-combiner": {
-      "version": "0.2.2",
-      "resolved": "https://registry.npmjs.org/stream-combiner/-/stream-combiner-0.2.2.tgz",
-      "integrity": "sha1-rsjLrBd7Vrb0+kec7YwZEs7lKFg=",
+      "version": "0.0.4",
+      "resolved": "https://registry.npmjs.org/stream-combiner/-/stream-combiner-0.0.4.tgz",
+      "integrity": "sha1-TV5DPBhSYd3mI8o/RMWGvPXErRQ=",
       "dev": true,
       "requires": {
-        "duplexer": "~0.1.1",
-        "through": "~2.3.4"
+        "duplexer": "~0.1.1"
       }
     },
     "stream-exhaust": {
diff --git a/package.json b/package.json
index 34ccdb6e..9e59ecf7 100644
--- a/package.json
+++ b/package.json
@@ -19,7 +19,7 @@
   },
   "devDependencies": {
     "clean-css": "^4.2.1",
-    "event-stream": "4.0.1",
+    "event-stream": "3.3.4",
     "gulp": "^4.0.0",
     "gulp-typedoc": "^2.2.2",
     "http-server": "^0.11.1",