diff --git a/package-lock.json b/package-lock.json
index ec9d8ca..72e94d0 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -25,6 +25,7 @@
       "resolved": "https://registry.npmjs.org/align-text/-/align-text-0.1.4.tgz",
       "integrity": "sha1-DNkKVhCT810KmSVsIrcGlDP60Rc=",
       "dev": true,
+      "optional": true,
       "requires": {
         "kind-of": "3.2.2",
         "longest": "1.0.1",
@@ -36,6 +37,7 @@
           "resolved": "https://registry.npmjs.org/kind-of/-/kind-of-3.2.2.tgz",
           "integrity": "sha1-MeohpzS6ubuw8yRm2JOupR5KPGQ=",
           "dev": true,
+          "optional": true,
           "requires": {
             "is-buffer": "1.1.6"
           }
@@ -2822,7 +2824,8 @@
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/longest/-/longest-1.0.1.tgz",
       "integrity": "sha1-MKCy2jj3N3DoKUoNIuZiXtd9AJc=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "loud-rejection": {
       "version": "1.6.0",
@@ -2882,9 +2885,9 @@
       }
     },
     "marked": {
-      "version": "0.3.17",
-      "resolved": "https://registry.npmjs.org/marked/-/marked-0.3.17.tgz",
-      "integrity": "sha512-+AKbNsjZl6jFfLPwHhWmGTqE009wTKn3RTmn9K8oUKHrX/abPJjtcRtXpYB/FFrwPJRUA86LX/de3T0knkPCmQ==",
+      "version": "4.0.10",
+      "resolved": "https://registry.npmjs.org/marked/-/marked-4.0.10.tgz",
+      "integrity": "sha512-+QvuFj0nGgO970fySghXGmuw+Fd0gD2x3+MqCWLIPf5oxdv1Ka6b2q+z9RP01P/IaKPMEramy+7cNy/Lw8c3hw==",
       "dev": true
     },
     "media-typer": {
diff --git a/package.json b/package.json
index 3cd4f0f..3e15cd8 100644
--- a/package.json
+++ b/package.json
@@ -25,7 +25,7 @@
     "gulp-wrap": "^0.13.0",
     "gulp-yaml": "^1.0.1",
     "handlebars": "^4.0.11",
-    "marked": "^0.3.17",
+    "marked": "^4.0.10",
     "merge-stream": "^1.0.1",
     "mocha": "^5.0.1"
   }