diff --git a/Predictor/PredictorWebService/package-lock.json b/Predictor/PredictorWebService/package-lock.json
index a369f49..df278ec 100644
--- a/Predictor/PredictorWebService/package-lock.json
+++ b/Predictor/PredictorWebService/package-lock.json
@@ -279,6 +279,11 @@
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     },
+    "async-limiter": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/async-limiter/-/async-limiter-1.0.0.tgz",
+      "integrity": "sha512-jp/uFnooOiO+L211eZOoSyzpOITMXx1rBITauYykG3BRYPu8h0UcxsPNB04RR5vo4Tyz3+ay17tR6JVf9qzYWg=="
+    },
     "atob": {
       "version": "2.1.2",
       "resolved": "https://registry.npmjs.org/atob/-/atob-2.1.2.tgz",
@@ -3407,9 +3412,12 @@
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     },
     "ws": {
-      "version": "7.4.6",
-      "resolved": "https://registry.npmjs.org/ws/-/ws-7.4.6.tgz",
-      "integrity": "sha512-YmhHDO4MzaDLB+M9ym/mDA5z0naX8j7SIlT8f8z+I0VtzsRbekxEutHSme7NPS2qE8StCYQNUnfWdXta/Yu85A=="
+      "version": "6.2.1",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-6.2.1.tgz",
+      "integrity": "sha512-GIyAXC2cB7LjvpgMt9EKS2ldqr0MTrORaleiOno6TweZ6r3TKtoFQWay/2PceJ3RuBasOHzXNn5Lrw1X0bEjqA==",
+      "requires": {
+        "async-limiter": "~1.0.0"
+      }
     },
     "xdg-basedir": {
       "version": "3.0.0",
diff --git a/Predictor/PredictorWebService/package.json b/Predictor/PredictorWebService/package.json
index c44f407..66307c4 100644
--- a/Predictor/PredictorWebService/package.json
+++ b/Predictor/PredictorWebService/package.json
@@ -12,7 +12,7 @@
     "mongoose": "^5.7.7",
     "nodemon": "^1.18.10",
     "query-string-parser": "^0.2.3",
-    "ws": "^7.4.6"
+    "ws": "^6.2.1"
   },
   "devDependencies": {
     "@types/node": "^11.13.0",