diff --git a/package-lock.json b/package-lock.json
index f867f10..29853d7 100644
--- a/package-lock.json
+++ b/package-lock.json
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@@ -4929,12 +4907,14 @@
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@@ -4949,17 +4929,20 @@
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@@ -5109,12 +5095,14 @@
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@@ -5310,7 +5301,8 @@
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@@ -5365,6 +5358,7 @@
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@@ -5408,12 +5402,14 @@
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-        "cors": "latest",
-        "event-stream": "latest",
+        "cors": "^2.8.5",
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-        "opn": "latest",
-        "proxy-middleware": "latest",
-        "send": "latest",
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+        "proxy-middleware": "^0.15.0",
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@@ -7818,6 +7814,16 @@
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+          "resolved": "https://registry.npmjs.org/cors/-/cors-2.8.5.tgz",
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+          "dev": true,
+          "requires": {
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@@ -7827,6 +7833,21 @@
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+          "resolved": "https://registry.npmjs.org/event-stream/-/event-stream-4.0.1.tgz",
+          "integrity": "sha512-qACXdu/9VHPBzcyhdOWR5/IahhGMf0roTeZJfzz077GwylcDd90yOHLouhmv7GJ5XzPi6ekaQWd8AvPP2nOvpA==",
+          "dev": true,
+          "requires": {
+            "duplexer": "^0.1.1",
+            "from": "^0.1.7",
+            "map-stream": "0.0.7",
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@@ -7848,10 +7869,16 @@
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+        "inherits": {
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+          "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.4.tgz",
+          "integrity": "sha512-k/vGaX4/Yla3WzyMCvTQOXYeIHvqOKtnqBduzTHpzpQZzAskKMhZ2K+EnBiSM9zGSoIFeMpXKxa4dYeZIQqewQ==",
+          "dev": true
+        },
+        "map-stream": {
+          "version": "0.0.7",
+          "resolved": "https://registry.npmjs.org/map-stream/-/map-stream-0.0.7.tgz",
+          "integrity": "sha1-ih8HiW2CsQkmvTdEokIACfiJdKg=",
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@@ -7867,18 +7894,24 @@
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-          "integrity": "sha512-bYJHo/LOmoTd+pfiYhfZDnf9zekVJrY+cnS2a5F2x+w5ppvTqObojTP7WiFG+kVZs9Inw+qQ/lw7TroWwhdd2g==",
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+          "resolved": "https://registry.npmjs.org/opn/-/opn-6.0.0.tgz",
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           "dev": true,
           "requires": {
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+        "proxy-middleware": {
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+          "resolved": "https://registry.npmjs.org/proxy-middleware/-/proxy-middleware-0.15.0.tgz",
+          "integrity": "sha1-o/3xvvtzD5UZZYcqwvYHTGFHelY=",
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-          "resolved": "https://registry.npmjs.org/send/-/send-0.16.2.tgz",
-          "integrity": "sha512-E64YFPUssFHEFBvpbbjr44NCLtI1AohxQ8ZSiJjQLskAdKuriYEP6VyGEsRDH8ScozGpkaX1BGvhanqCwkcEZw==",
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+          "resolved": "https://registry.npmjs.org/send/-/send-0.17.1.tgz",
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@@ -7888,12 +7921,12 @@
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-            "mime": "1.4.1",
-            "ms": "2.0.0",
+            "http-errors": "~1.7.2",
+            "mime": "1.6.0",
+            "ms": "2.1.1",
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-            "range-parser": "~1.2.0",
-            "statuses": "~1.4.0"
+            "range-parser": "~1.2.1",
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@@ -7903,16 +7936,74 @@
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+                  "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
+                  "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g=",
+                  "dev": true
+                }
+              }
+            },
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+              "resolved": "https://registry.npmjs.org/http-errors/-/http-errors-1.7.3.tgz",
+              "integrity": "sha512-ZTTX0MWrsQ2ZAhA1cejAwDLycFsd7I7nVtnkT3Ol0aqodaKW+0CTZDQ1uBv5whptCnc8e8HeRRJxRs0kmm/Qfw==",
+              "dev": true,
+              "requires": {
+                "depd": "~1.1.2",
+                "inherits": "2.0.4",
+                "setprototypeof": "1.1.1",
+                "statuses": ">= 1.5.0 < 2",
+                "toidentifier": "1.0.0"
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-              "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
-              "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g=",
+              "version": "2.1.1",
+              "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.1.tgz",
+              "integrity": "sha512-tgp+dl5cGk28utYktBsrFqA7HKgrhgPsg6Z/EfhWI4gl1Hwq8B/GmY/0oXZ6nF8hDVesS/FpnYaD/kOWhYQvyg==",
+              "dev": true
+            },
+            "range-parser": {
+              "version": "1.2.1",
+              "resolved": "https://registry.npmjs.org/range-parser/-/range-parser-1.2.1.tgz",
+              "integrity": "sha512-Hrgsx+orqoygnmhFbKaHE6c296J+HTAQXoxEF6gNupROmmGJRoyzfG3ccAveqCBrwr/2yxQ5BVd/GTl5agOwSg==",
+              "dev": true
+            },
+            "statuses": {
+              "version": "1.5.0",
+              "resolved": "https://registry.npmjs.org/statuses/-/statuses-1.5.0.tgz",
+              "integrity": "sha1-Fhx9rBd2Wf2YEfQ3cfqZOBR4Yow=",
               "dev": true
             }
           }
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+        "setprototypeof": {
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+          "resolved": "https://registry.npmjs.org/setprototypeof/-/setprototypeof-1.1.1.tgz",
+          "integrity": "sha512-JvdAWfbXeIGaZ9cILp38HntZSFSo3mWg6xGcJJsd+d4aRMOqauag1C63dJfDw7OaMYwEbHMOxEZ1lqVRYP2OAw==",
+          "dev": true
+        },
+        "split": {
+          "version": "1.0.1",
+          "resolved": "https://registry.npmjs.org/split/-/split-1.0.1.tgz",
+          "integrity": "sha512-mTyOoPbrivtXnwnIxZRFYRrPNtEFKlpB2fvjSnCQUiAA6qAZzqwna5envK4uk6OIeP17CsdF3rSBGYVBsU0Tkg==",
+          "dev": true,
+          "requires": {
+            "through": "2"
+          }
+        },
+        "stream-combiner": {
+          "version": "0.2.2",
+          "resolved": "https://registry.npmjs.org/stream-combiner/-/stream-combiner-0.2.2.tgz",
+          "integrity": "sha1-rsjLrBd7Vrb0+kec7YwZEs7lKFg=",
+          "dev": true,
+          "requires": {
+            "duplexer": "~0.1.1",
+            "through": "~2.3.4"
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+        },
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           "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.0.tgz",
@@ -8095,7 +8186,8 @@
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       "integrity": "sha1-MKCy2jj3N3DoKUoNIuZiXtd9AJc=",
-      "dev": true
+      "dev": true,
+      "optional": true
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@@ -8186,12 +8278,6 @@
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-      "resolved": "https://registry.npmjs.org/map-stream/-/map-stream-0.1.0.tgz",
-      "integrity": "sha1-5WqpTEyAVaFkBKBnS3jyFffI4ZQ=",
-      "dev": true
-    },
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       "resolved": "https://registry.npmjs.org/map-visit/-/map-visit-1.0.0.tgz",
@@ -10190,12 +10276,6 @@
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-      "resolved": "https://registry.npmjs.org/proxy-middleware/-/proxy-middleware-0.15.0.tgz",
-      "integrity": "sha1-o/3xvvtzD5UZZYcqwvYHTGFHelY=",
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@@ -11856,15 +11936,6 @@
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-      "resolved": "https://registry.npmjs.org/split/-/split-0.3.3.tgz",
-      "integrity": "sha1-zQ7qXmOiEd//frDwkcQTPi0N0o8=",
-      "dev": true,
-      "requires": {
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       "resolved": "https://registry.npmjs.org/split-string/-/split-string-3.1.0.tgz",
@@ -12182,15 +12253,6 @@
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-      "resolved": "https://registry.npmjs.org/stream-combiner/-/stream-combiner-0.0.4.tgz",
-      "integrity": "sha1-TV5DPBhSYd3mI8o/RMWGvPXErRQ=",
-      "dev": true,
-      "requires": {
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@@ -12539,6 +12601,12 @@
         "repeat-string": "^1.6.1"
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+    "toidentifier": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/toidentifier/-/toidentifier-1.0.0.tgz",
+      "integrity": "sha512-yaOH/Pk/VEhBWWTlhI+qXxDFXlejDGcQipMlyxda9nthulaxLZUNcUqFxokp0vcYnvteJln5FNQDRrxj3YcbVw==",
+      "dev": true
+    },
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       "resolved": "https://registry.npmjs.org/toposort/-/toposort-1.0.7.tgz",
diff --git a/package.json b/package.json
index 2d19e43..ce51131 100644
--- a/package.json
+++ b/package.json
@@ -28,7 +28,7 @@
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     "@angular/router": "^6.0.0",
-    "core-js": "^2.5.4",
+    "core-js": "^2.6.11",
     "rxjs": "^6.0.0",
     "zone.js": "^0.8.26"
   },