diff --git a/package-lock.json b/package-lock.json
index bc2a669..87eeb23 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -26,6 +26,7 @@
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       "integrity": "sha1-DNkKVhCT810KmSVsIrcGlDP60Rc=",
       "dev": true,
+      "optional": true,
       "requires": {
         "kind-of": "^3.0.2",
         "longest": "^1.0.1",
@@ -954,7 +955,8 @@
       "version": "1.1.4",
       "resolved": "https://registry.npmjs.org/is-buffer/-/is-buffer-1.1.4.tgz",
       "integrity": "sha1-z8hszV3FpS+oBIkRHGkgxFfi2Ys=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "is-fullwidth-code-point": {
       "version": "2.0.0",
@@ -1087,6 +1089,7 @@
       "resolved": "https://registry.npmjs.org/kind-of/-/kind-of-3.1.0.tgz",
       "integrity": "sha1-R11pil5J/15T0U4+cyQp3Iv0z0c=",
       "dev": true,
+      "optional": true,
       "requires": {
         "is-buffer": "^1.0.2"
       }
@@ -1199,7 +1202,8 @@
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/longest/-/longest-1.0.1.tgz",
       "integrity": "sha1-MKCy2jj3N3DoKUoNIuZiXtd9AJc=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "lru-cache": {
       "version": "4.1.3",
@@ -1219,9 +1223,9 @@
       }
     },
     "marked": {
-      "version": "0.5.1",
-      "resolved": "https://registry.npmjs.org/marked/-/marked-0.5.1.tgz",
-      "integrity": "sha512-iUkBZegCZou4AdwbKTwSW/lNDcz5OuRSl3qdcl31Ia0B2QPG0Jn+tKblh/9/eP9/6+4h27vpoh8wel/vQOV0vw=="
+      "version": "4.0.10",
+      "resolved": "https://registry.npmjs.org/marked/-/marked-4.0.10.tgz",
+      "integrity": "sha512-+QvuFj0nGgO970fySghXGmuw+Fd0gD2x3+MqCWLIPf5oxdv1Ka6b2q+z9RP01P/IaKPMEramy+7cNy/Lw8c3hw=="
     },
     "mem": {
       "version": "4.0.0",
@@ -1667,7 +1671,8 @@
       "version": "1.6.1",
       "resolved": "https://registry.npmjs.org/repeat-string/-/repeat-string-1.6.1.tgz",
       "integrity": "sha1-jcrkcOHIirwtYA//Sndihtp15jc=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "request": {
       "version": "2.88.0",
@@ -1990,7 +1995,7 @@
         },
         "readable-stream": {
           "version": "2.3.6",
-          "resolved": "http://registry.npmjs.org/readable-stream/-/readable-stream-2.3.6.tgz",
+          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.3.6.tgz",
           "integrity": "sha512-tQtKA9WIAhBF3+VLAseyMqZeBjW0AHJoxOtYqSUZNJxauErmLbVm2FW1y+J/YA9dUrAC39ITejlZWhVIwawkKw==",
           "requires": {
             "core-util-is": "~1.0.0",
@@ -2321,7 +2326,7 @@
         },
         "strip-ansi": {
           "version": "3.0.1",
-          "resolved": "http://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
           "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
           "requires": {
             "ansi-regex": "^2.0.0"
diff --git a/package.json b/package.json
index 7e55b9b..e037a6b 100644
--- a/package.json
+++ b/package.json
@@ -22,7 +22,7 @@
   "preferGlobal": true,
   "dependencies": {
     "cheerio": "0.22.x",
-    "marked": "0.5.x",
+    "marked": "4.0.x",
     "moment": "2.22.x",
     "mongodb": "3.1.x",
     "redis": "2.8.x",