diff --git a/package-lock.json b/package-lock.json
index 05066c9..d5881f6 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -3975,6 +3975,7 @@
           "version": "0.0.9",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "inherits": "2.0.3"
           }
@@ -3999,7 +4000,8 @@
         "buffer-shims": {
           "version": "1.0.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "caseless": {
           "version": "0.12.0",
@@ -4016,12 +4018,14 @@
         "code-point-at": {
           "version": "1.1.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "combined-stream": {
           "version": "1.0.5",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "delayed-stream": "1.0.0"
           }
@@ -4034,17 +4038,20 @@
         "console-control-strings": {
           "version": "1.1.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "core-util-is": {
           "version": "1.0.2",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "cryptiles": {
           "version": "2.0.5",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "boom": "2.10.1"
           }
@@ -4084,7 +4091,8 @@
         "delayed-stream": {
           "version": "1.0.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "delegates": {
           "version": "1.0.0",
@@ -4116,7 +4124,8 @@
         "extsprintf": {
           "version": "1.0.2",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "forever-agent": {
           "version": "0.6.1",
@@ -4239,6 +4248,7 @@
           "version": "3.1.3",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "boom": "2.10.1",
             "cryptiles": "2.0.5",
@@ -4286,6 +4296,7 @@
           "version": "1.0.0",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "number-is-nan": "1.0.1"
           }
@@ -4299,7 +4310,8 @@
         "isarray": {
           "version": "1.0.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "isstream": {
           "version": "0.1.2",
@@ -4372,12 +4384,14 @@
         "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"
           }
@@ -4453,7 +4467,8 @@
         "number-is-nan": {
           "version": "1.0.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "oauth-sign": {
           "version": "0.8.2",
@@ -4511,7 +4526,8 @@
         "process-nextick-args": {
           "version": "1.0.7",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "punycode": {
           "version": "1.4.1",
@@ -4549,6 +4565,7 @@
           "version": "2.2.9",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "buffer-shims": "1.0.0",
             "core-util-is": "1.0.2",
@@ -4600,7 +4617,8 @@
         "safe-buffer": {
           "version": "5.0.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "semver": {
           "version": "5.3.0",
@@ -4624,6 +4642,7 @@
           "version": "1.0.9",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "hoek": "2.16.3"
           }
@@ -4657,6 +4676,7 @@
           "version": "1.0.2",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "code-point-at": "1.1.0",
             "is-fullwidth-code-point": "1.0.0",
@@ -4667,6 +4687,7 @@
           "version": "1.0.1",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "safe-buffer": "5.0.1"
           }
@@ -4695,6 +4716,7 @@
           "version": "2.2.1",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "block-stream": "0.0.9",
             "fstream": "1.0.11",
@@ -4750,7 +4772,8 @@
         "util-deprecate": {
           "version": "1.0.2",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "uuid": {
           "version": "3.0.1",
@@ -6617,6 +6640,12 @@
           "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
           "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g=",
           "dev": true
+        },
+        "pify": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/pify/-/pify-3.0.0.tgz",
+          "integrity": "sha1-5aSs0sEB/fPZpNB/DbxNtJ3SgXY=",
+          "dev": true
         }
       }
     },
@@ -7216,6 +7245,14 @@
       "dev": true,
       "requires": {
         "pify": "3.0.0"
+      },
+      "dependencies": {
+        "pify": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/pify/-/pify-3.0.0.tgz",
+          "integrity": "sha1-5aSs0sEB/fPZpNB/DbxNtJ3SgXY=",
+          "dev": true
+        }
       }
     },
     "map-cache": {
@@ -7861,6 +7898,14 @@
             "parse-json": "4.0.0",
             "pify": "3.0.0",
             "strip-bom": "3.0.0"
+          },
+          "dependencies": {
+            "pify": {
+              "version": "3.0.0",
+              "resolved": "https://registry.npmjs.org/pify/-/pify-3.0.0.tgz",
+              "integrity": "sha1-5aSs0sEB/fPZpNB/DbxNtJ3SgXY=",
+              "dev": true
+            }
           }
         },
         "parse-json": {
@@ -7880,6 +7925,14 @@
           "dev": true,
           "requires": {
             "pify": "3.0.0"
+          },
+          "dependencies": {
+            "pify": {
+              "version": "3.0.0",
+              "resolved": "https://registry.npmjs.org/pify/-/pify-3.0.0.tgz",
+              "integrity": "sha1-5aSs0sEB/fPZpNB/DbxNtJ3SgXY=",
+              "dev": true
+            }
           }
         },
         "read-pkg": {
@@ -8021,6 +8074,7 @@
           "version": "0.1.4",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "kind-of": "3.2.2",
             "longest": "1.0.1",
@@ -8831,7 +8885,8 @@
         "longest": {
           "version": "1.0.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "loose-envify": {
           "version": "1.3.1",
@@ -10086,9 +10141,9 @@
       "dev": true
     },
     "pify": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/pify/-/pify-3.0.0.tgz",
-      "integrity": "sha1-5aSs0sEB/fPZpNB/DbxNtJ3SgXY=",
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/pify/-/pify-4.0.1.tgz",
+      "integrity": "sha512-uB80kBFb/tfd68bVleG9T5GGsGPjJrLAUpR5PZIrhBnIaRTQRjqdJSsIKkOP6OAIFbj7GOrcudc5pNjZ+geV2g==",
       "dev": true
     },
     "pinkie": {
@@ -10126,6 +10181,14 @@
             "parse-json": "4.0.0",
             "pify": "3.0.0",
             "strip-bom": "3.0.0"
+          },
+          "dependencies": {
+            "pify": {
+              "version": "3.0.0",
+              "resolved": "https://registry.npmjs.org/pify/-/pify-3.0.0.tgz",
+              "integrity": "sha1-5aSs0sEB/fPZpNB/DbxNtJ3SgXY=",
+              "dev": true
+            }
           }
         },
         "parse-json": {
@@ -13753,6 +13816,12 @@
           "resolved": "https://registry.npmjs.org/detect-indent/-/detect-indent-5.0.0.tgz",
           "integrity": "sha1-OHHMCmoALow+Wzz38zYmRnXwa50=",
           "dev": true
+        },
+        "pify": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/pify/-/pify-3.0.0.tgz",
+          "integrity": "sha1-5aSs0sEB/fPZpNB/DbxNtJ3SgXY=",
+          "dev": true
         }
       }
     },
diff --git a/package.json b/package.json
index 1fe55d8..f9a614a 100644
--- a/package.json
+++ b/package.json
@@ -50,7 +50,7 @@
     "npm-run-all": "^4.0.0",
     "npmpub": "^3.1.0",
     "nyc": "^11.0.0",
-    "pify": "^3.0.0",
+    "pify": "^4.0.1",
     "prettier": "^1.5.2",
     "remark-cli": "^5.0.0",
     "remark-preset-lint-itgalaxy": "^12.0.0",