diff --git a/lesson-4/lesson-4-completed/package-lock.json b/lesson-4/lesson-4-completed/package-lock.json
index cdbbd60..3ef838a 100644
--- a/lesson-4/lesson-4-completed/package-lock.json
+++ b/lesson-4/lesson-4-completed/package-lock.json
@@ -388,14 +388,6 @@
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       "integrity": "sha1-eePVhlU0aQn+bw9Fpd5oEDspTSA="
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-      "integrity": "sha1-U4tm8+5izRq1HsMjgp0flIDHS+s=",
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@@ -605,7 +597,8 @@
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           "version": "2.1.1",
           "bundled": true,
-          "dev": true
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@@ -656,7 +649,8 @@
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           "version": "0.4.2",
           "bundled": true,
-          "dev": true
+          "dev": true,
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@@ -671,6 +665,7 @@
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           "bundled": true,
           "dev": true,
+          "optional": true,
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           }
@@ -679,6 +674,7 @@
           "version": "2.10.1",
           "bundled": true,
           "dev": true,
+          "optional": true,
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@@ -687,6 +683,7 @@
           "version": "1.1.7",
           "bundled": true,
           "dev": true,
+          "optional": true,
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@@ -695,7 +692,8 @@
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           "bundled": true,
-          "dev": true
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@@ -712,12 +710,14 @@
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           "version": "1.1.0",
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-          "dev": true
+          "dev": true,
+          "optional": true
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           "version": "1.0.5",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
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@@ -725,22 +725,26 @@
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           "version": "0.0.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
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           "version": "1.1.0",
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-          "dev": true
+          "dev": true,
+          "optional": true
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           "version": "1.0.2",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
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         "cryptiles": {
           "version": "2.0.5",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
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@@ -780,7 +784,8 @@
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           "bundled": true,
-          "dev": true
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@@ -812,7 +817,8 @@
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           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
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@@ -834,12 +840,14 @@
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           "version": "1.0.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
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           "version": "1.0.11",
           "bundled": true,
           "dev": true,
+          "optional": true,
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@@ -895,6 +903,7 @@
           "version": "7.1.2",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
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@@ -907,7 +916,8 @@
         "graceful-fs": {
           "version": "4.1.11",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
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@@ -935,6 +945,7 @@
           "version": "3.1.3",
           "bundled": true,
           "dev": true,
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             "cryptiles": "2.0.5",
@@ -945,7 +956,8 @@
         "hoek": {
           "version": "2.16.3",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
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@@ -962,6 +974,7 @@
           "version": "1.0.6",
           "bundled": true,
           "dev": true,
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             "wrappy": "1.0.2"
@@ -970,7 +983,8 @@
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           "version": "2.0.3",
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-          "dev": true
+          "dev": true,
+          "optional": true
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@@ -982,6 +996,7 @@
           "version": "1.0.0",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
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           }
@@ -995,7 +1010,8 @@
         "isarray": {
           "version": "1.0.0",
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-          "dev": true
+          "dev": true,
+          "optional": true
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@@ -1068,12 +1084,14 @@
         "mime-db": {
           "version": "1.27.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "mime-types": {
           "version": "2.1.15",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "mime-db": "1.27.0"
           }
@@ -1082,6 +1100,7 @@
           "version": "3.0.4",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "brace-expansion": "1.1.7"
           }
@@ -1089,12 +1108,14 @@
         "minimist": {
           "version": "0.0.8",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "mkdirp": {
           "version": "0.5.1",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "minimist": "0.0.8"
           }
@@ -1149,7 +1170,8 @@
         "number-is-nan": {
           "version": "1.0.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "oauth-sign": {
           "version": "0.8.2",
@@ -1167,6 +1189,7 @@
           "version": "1.4.0",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "wrappy": "1.0.2"
           }
@@ -1196,7 +1219,8 @@
         "path-is-absolute": {
           "version": "1.0.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "performance-now": {
           "version": "0.2.0",
@@ -1207,7 +1231,8 @@
         "process-nextick-args": {
           "version": "1.0.7",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "punycode": {
           "version": "1.4.1",
@@ -1245,6 +1270,7 @@
           "version": "2.2.9",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "buffer-shims": "1.0.0",
             "core-util-is": "1.0.2",
@@ -1289,6 +1315,7 @@
           "version": "2.6.1",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "glob": "7.1.2"
           }
@@ -1296,7 +1323,8 @@
         "safe-buffer": {
           "version": "5.0.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
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         "semver": {
           "version": "5.3.0",
@@ -1320,6 +1348,7 @@
           "version": "1.0.9",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "hoek": "2.16.3"
           }
@@ -1349,24 +1378,26 @@
             }
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-          "bundled": true,
-          "dev": true,
-          "requires": {
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-          }
-        },
         "string-width": {
           "version": "1.0.2",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "code-point-at": "1.1.0",
             "is-fullwidth-code-point": "1.0.0",
             "strip-ansi": "3.0.1"
           }
         },
+        "string_decoder": {
+          "version": "1.0.1",
+          "bundled": true,
+          "dev": true,
+          "optional": true,
+          "requires": {
+            "safe-buffer": "5.0.1"
+          }
+        },
         "stringstream": {
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           "bundled": true,
@@ -1377,6 +1408,7 @@
           "version": "3.0.1",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "ansi-regex": "2.1.1"
           }
@@ -1391,6 +1423,7 @@
           "version": "2.2.1",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "block-stream": "0.0.9",
             "fstream": "1.0.11",
@@ -1446,7 +1479,8 @@
         "util-deprecate": {
           "version": "1.0.2",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "uuid": {
           "version": "3.0.1",
@@ -1475,7 +1509,8 @@
         "wrappy": {
           "version": "1.0.2",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         }
       }
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@@ -1725,7 +1760,8 @@
     "is-stream": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/is-stream/-/is-stream-1.1.0.tgz",
-      "integrity": "sha1-EtSj3U5o4Lec6428hBc66A2RykQ="
+      "integrity": "sha1-EtSj3U5o4Lec6428hBc66A2RykQ=",
+      "dev": true
     },
     "isarray": {
       "version": "1.0.0",
@@ -1974,13 +2010,9 @@
       "integrity": "sha1-KzJxhOiZIQEXeyhWP7XnECrNDKk="
     },
     "node-fetch": {
-      "version": "1.7.3",
-      "resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-1.7.3.tgz",
-      "integrity": "sha512-NhZ4CsKx7cYm2vSrBAr2PvFOe6sWDf0UYLRqA6svUYg7+/TSfVAu49jYC4BvQ4Sms9SZgdqGBgroqfDhJdTyKQ==",
-      "requires": {
-        "encoding": "0.1.12",
-        "is-stream": "1.1.0"
-      }
+      "version": "2.6.1",
+      "resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-2.6.1.tgz",
+      "integrity": "sha512-V4aYg89jEoVRxRb2fJdAg8FHvI7cEyYdVAh94HH0UIK8oJxUfkjlDQN9RbMx+bEjP7+ggMiFRprSti032Oipxw=="
     },
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@@ -2460,15 +2492,6 @@
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       }
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-      "version": "1.0.3",
-      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.0.3.tgz",
-      "integrity": "sha512-4AH6Z5fzNNBcH+6XDMfA/BTt87skxqJlO0lAh3Dker5zThcAxG6mKz+iGu308UKoPPQ8Dcqx/4JhujzltRa+hQ==",
-      "dev": true,
-      "requires": {
-        "safe-buffer": "5.1.1"
-      }
-    },
     "string-width": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/string-width/-/string-width-2.1.1.tgz",
@@ -2479,6 +2502,15 @@
         "strip-ansi": "4.0.0"
       }
     },
+    "string_decoder": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.0.3.tgz",
+      "integrity": "sha512-4AH6Z5fzNNBcH+6XDMfA/BTt87skxqJlO0lAh3Dker5zThcAxG6mKz+iGu308UKoPPQ8Dcqx/4JhujzltRa+hQ==",
+      "dev": true,
+      "requires": {
+        "safe-buffer": "5.1.1"
+      }
+    },
     "strip-ansi": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-4.0.0.tgz",
diff --git a/lesson-4/lesson-4-completed/package.json b/lesson-4/lesson-4-completed/package.json
index 5445df1..bdcfb57 100644
--- a/lesson-4/lesson-4-completed/package.json
+++ b/lesson-4/lesson-4-completed/package.json
@@ -14,7 +14,7 @@
     "express": "~4.15.5",
     "mongoose": "^5.0.0-rc1",
     "morgan": "~1.9.0",
-    "node-fetch": "^1.7.3",
+    "node-fetch": "^2.6.1",
     "serve-favicon": "~2.4.5"
   },
   "devDependencies": {