diff --git a/lib/commands/serve.js b/lib/commands/serve.js
index f166a67..80ff996 100644
--- a/lib/commands/serve.js
+++ b/lib/commands/serve.js
@@ -4,7 +4,7 @@ const serveStatic = require("serve-static");
 const connect = require("connect");
 const livereload = require("connect-livereload");
 const lrserver = require("livereload");
-const opn = require("opn");
+const open = require("open");
 const chalk = require("chalk");
 const util = require("../util/index");
 const getPort = require("get-port");
@@ -59,7 +59,7 @@ module.exports = function(
         .watch(path);
 
       if (openInBrowser) {
-        opn(`http://localhost:${port}`);
+        open(`http://localhost:${port}`);
       }
 
       const msg =
diff --git a/lib/commands/start.js b/lib/commands/start.js
index f7583f5..86beb6f 100644
--- a/lib/commands/start.js
+++ b/lib/commands/start.js
@@ -3,7 +3,6 @@
 const connect = require("connect");
 const serveStatic = require("serve-static");
 const Renderer = require("docsify-server-renderer");
-const fs = require("fs");
 const util = require("../util/index");
 const chalk = require("chalk");
 const LRU = require("lru-cache");
diff --git a/package-lock.json b/package-lock.json
index 7072e95..e248a66 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4,53 +4,94 @@
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
-    "acorn": {
-      "version": "5.7.3",
-      "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.7.3.tgz",
-      "integrity": "sha512-T/zvzYRfbVojPWahDsE5evJdHb3oJoQfFbsrKM7w5Zcs++Tr257tia3BmMP8XYVjp1S9RZXQMh7gao96BlqZOw==",
-      "dev": true
+    "@babel/code-frame": {
+      "version": "7.5.5",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.5.5.tgz",
+      "integrity": "sha512-27d4lZoomVyo51VegxI20xZPuSHusqbQag/ztrBC7wegWoQ1nLREPVSKSW8byhTlzTKyNE4ifaTA6lCp7JjpFw==",
+      "dev": true,
+      "requires": {
+        "@babel/highlight": "^7.0.0"
+      }
     },
-    "acorn-jsx": {
-      "version": "3.0.1",
-      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-3.0.1.tgz",
-      "integrity": "sha1-r9+UiPsezvyDSPb7IvRk4ypYs2s=",
+    "@babel/highlight": {
+      "version": "7.5.0",
+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.5.0.tgz",
+      "integrity": "sha512-7dV4eu9gBxoM0dAnj/BCFDW9LFU0zvTrkq0ugM7pnHEgguOEeOz1so2ZghEdzviYzQEED0r4EAgpsBChKy1TRQ==",
       "dev": true,
       "requires": {
-        "acorn": "^3.0.4"
-      },
-      "dependencies": {
-        "acorn": {
-          "version": "3.3.0",
-          "resolved": "https://registry.npmjs.org/acorn/-/acorn-3.3.0.tgz",
-          "integrity": "sha1-ReN/s56No/JbruP/U2niu18iAXo=",
-          "dev": true
-        }
+        "chalk": "^2.0.0",
+        "esutils": "^2.0.2",
+        "js-tokens": "^4.0.0"
+      }
+    },
+    "@sindresorhus/is": {
+      "version": "0.14.0",
+      "resolved": "https://registry.npmjs.org/@sindresorhus/is/-/is-0.14.0.tgz",
+      "integrity": "sha512-9NET910DNaIPngYnLLPeg+Ogzqsi9uM4mSboU5y6p8S5DzMTVEsJZrawi+BoDNUVBa2DhJqQYUFvMDfgU062LQ=="
+    },
+    "@szmarczak/http-timer": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/@szmarczak/http-timer/-/http-timer-1.1.2.tgz",
+      "integrity": "sha512-XIB2XbzHTN6ieIjfIMV9hlVcfPU26s2vafYWQcZHWXHOxiaRZYEDKEwdl129Zyg50+foYV2jCgtrqSA6qNuNSA==",
+      "requires": {
+        "defer-to-connect": "^1.0.1"
       }
     },
+    "acorn": {
+      "version": "7.1.0",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.1.0.tgz",
+      "integrity": "sha512-kL5CuoXA/dgxlBbVrflsflzQ3PAas7RYZB52NOm/6839iVYJgKMJ3cQJD+t2i5+qFa8h3MDpEOJiS64E8JLnSQ==",
+      "dev": true
+    },
+    "acorn-jsx": {
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.1.0.tgz",
+      "integrity": "sha512-tMUqwBWfLFbJbizRmEcWSLw6HnFzfdJs2sOJEOwwtVPMoH/0Ay+E703oZz78VSXZiiDcZrQ5XKjPIUQixhmgVw==",
+      "dev": true
+    },
     "ajv": {
-      "version": "5.5.2",
-      "resolved": "https://registry.npmjs.org/ajv/-/ajv-5.5.2.tgz",
-      "integrity": "sha1-c7Xuyj+rZT49P5Qis0GtQiBdyWU=",
+      "version": "6.10.2",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.10.2.tgz",
+      "integrity": "sha512-TXtUUEYHuaTEbLZWIKUr5pmBuhDLy+8KYtPYdcV8qC+pOZL+NKqYwvWSRrVXHn+ZmRRAu8vJTAznH7Oag6RVRw==",
       "dev": true,
       "requires": {
-        "co": "^4.6.0",
-        "fast-deep-equal": "^1.0.0",
+        "fast-deep-equal": "^2.0.1",
         "fast-json-stable-stringify": "^2.0.0",
-        "json-schema-traverse": "^0.3.0"
+        "json-schema-traverse": "^0.4.1",
+        "uri-js": "^4.2.2"
       }
     },
-    "ajv-keywords": {
-      "version": "2.1.1",
-      "resolved": "https://registry.npmjs.org/ajv-keywords/-/ajv-keywords-2.1.1.tgz",
-      "integrity": "sha1-YXmX/F9gV2iUxDX5QNgZ4TW4B2I=",
-      "dev": true
-    },
     "ansi-align": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/ansi-align/-/ansi-align-2.0.0.tgz",
-      "integrity": "sha1-w2rsy6VjuJzrVW82kPCx2eNUf38=",
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/ansi-align/-/ansi-align-3.0.0.tgz",
+      "integrity": "sha512-ZpClVKqXN3RGBmKibdfWzqCY4lnjEuoNzU5T0oEFpfd/z5qJHVarukridD4juLO2FXMiwUQxr9WqQtaYa8XRYw==",
       "requires": {
-        "string-width": "^2.0.0"
+        "string-width": "^3.0.0"
+      },
+      "dependencies": {
+        "ansi-regex": {
+          "version": "4.1.0",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
+          "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg=="
+        },
+        "string-width": {
+          "version": "3.1.0",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
+          "integrity": "sha512-vafcv6KjVZKSgz06oM/H6GDBrAtz8vdhQakGjFIvNrHA6y3HCF1CInLy+QLq8dTJPQ1b+KDUqDFctkdRW44e1w==",
+          "requires": {
+            "emoji-regex": "^7.0.1",
+            "is-fullwidth-code-point": "^2.0.0",
+            "strip-ansi": "^5.1.0"
+          }
+        },
+        "strip-ansi": {
+          "version": "5.2.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
+          "integrity": "sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==",
+          "requires": {
+            "ansi-regex": "^4.1.0"
+          }
+        }
       }
     },
     "ansi-escapes": {
@@ -64,17 +105,30 @@
       "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8="
     },
     "ansi-styles": {
-      "version": "2.2.1",
-      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-2.2.1.tgz",
-      "integrity": "sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4="
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
+      "integrity": "sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==",
+      "requires": {
+        "color-convert": "^1.9.0"
+      }
     },
     "anymatch": {
-      "version": "1.3.2",
-      "resolved": "https://registry.npmjs.org/anymatch/-/anymatch-1.3.2.tgz",
-      "integrity": "sha512-0XNayC8lTHQ2OI8aljNCN3sSx6hsr/1+rlcDAotXJR7C1oZZHCNsfpbKwMjRA3Uqb5tF1Rae2oloTr4xpq+WjA==",
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/anymatch/-/anymatch-2.0.0.tgz",
+      "integrity": "sha512-5teOsQWABXHHBFP9y3skS5P3d/WfWXpv3FUpy+LorMrNYaT9pI4oLMQX7jzQ2KklNpGpWHzdCXTDT2Y3XGlZBw==",
       "requires": {
-        "micromatch": "^2.1.5",
-        "normalize-path": "^2.0.0"
+        "micromatch": "^3.1.4",
+        "normalize-path": "^2.1.1"
+      },
+      "dependencies": {
+        "normalize-path": {
+          "version": "2.1.1",
+          "resolved": "https://registry.npmjs.org/normalize-path/-/normalize-path-2.1.1.tgz",
+          "integrity": "sha1-GrKLVW4Zg2Oowab35vogE3/mrtk=",
+          "requires": {
+            "remove-trailing-separator": "^1.0.1"
+          }
+        }
       }
     },
     "argparse": {
@@ -87,12 +141,9 @@
       }
     },
     "arr-diff": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/arr-diff/-/arr-diff-2.0.0.tgz",
-      "integrity": "sha1-jzuCf5Vai9ZpaX5KQlasPOrjVs8=",
-      "requires": {
-        "arr-flatten": "^1.0.1"
-      }
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/arr-diff/-/arr-diff-4.0.0.tgz",
+      "integrity": "sha1-1kYQdP6/7HHn4VI1dhoyml3HxSA="
     },
     "arr-flatten": {
       "version": "1.1.0",
@@ -105,36 +156,36 @@
       "integrity": "sha1-45sJrqne+Gao8gbiiK9jkZuuOcQ="
     },
     "array-unique": {
-      "version": "0.2.1",
-      "resolved": "https://registry.npmjs.org/array-unique/-/array-unique-0.2.1.tgz",
-      "integrity": "sha1-odl8yvy8JiXMcPrc6zalDFiwGlM="
+      "version": "0.3.2",
+      "resolved": "https://registry.npmjs.org/array-unique/-/array-unique-0.3.2.tgz",
+      "integrity": "sha1-qJS3XUvE9s1nnvMkSp/Y9Gri1Cg="
     },
     "assign-symbols": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/assign-symbols/-/assign-symbols-1.0.0.tgz",
       "integrity": "sha1-WWZ/QfrdTyDMvCu5a41Pf3jsA2c="
     },
+    "astral-regex": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/astral-regex/-/astral-regex-1.0.0.tgz",
+      "integrity": "sha512-+Ryf6g3BKoRc7jfp7ad8tM4TtMiaWvbF/1/sQcZPkkS7ag3D5nMBCe2UfOTONtAkaG0tO0ij3C5Lwmf1EiyjHg==",
+      "dev": true
+    },
     "async-each": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/async-each/-/async-each-1.0.3.tgz",
+      "integrity": "sha512-z/WhQ5FPySLdvREByI2vZiTWwCnF0moMJ1hK9YQwDTHKh6I7/uSckMetoRGb5UBZPC1z0jlw+n/XCgjeH7y1AQ=="
+    },
+    "async-limiter": {
       "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/async-each/-/async-each-1.0.1.tgz",
-      "integrity": "sha1-GdOGodntxufByF04iu28xW0zYC0="
+      "resolved": "https://registry.npmjs.org/async-limiter/-/async-limiter-1.0.1.tgz",
+      "integrity": "sha512-csOlWGAcRFJaI6m+F2WKdnMKr4HhdhFVBk0H/QbJFMCr+uO2kwohwXQPxw/9OCxp05r5ghVBFSyioixx3gfkNQ=="
     },
     "atob": {
       "version": "2.1.2",
       "resolved": "https://registry.npmjs.org/atob/-/atob-2.1.2.tgz",
       "integrity": "sha512-Wm6ukoaOGJi/73p/cl2GvLjTI5JM1k/O14isD73YML8StrH/7/lRFgmg8nICZgD3bZZvjwCGxtMOD3wWNAu8cg=="
     },
-    "babel-code-frame": {
-      "version": "6.26.0",
-      "resolved": "https://registry.npmjs.org/babel-code-frame/-/babel-code-frame-6.26.0.tgz",
-      "integrity": "sha1-Y/1D99weO7fONZR9uP42mj9Yx0s=",
-      "dev": true,
-      "requires": {
-        "chalk": "^1.1.3",
-        "esutils": "^2.0.2",
-        "js-tokens": "^3.0.2"
-      }
-    },
     "babel-polyfill": {
       "version": "6.23.0",
       "resolved": "https://registry.npmjs.org/babel-polyfill/-/babel-polyfill-6.23.0.tgz",
@@ -214,62 +265,50 @@
             "is-data-descriptor": "^1.0.0",
             "kind-of": "^6.0.2"
           }
-        },
-        "isobject": {
-          "version": "3.0.1",
-          "resolved": "https://registry.npmjs.org/isobject/-/isobject-3.0.1.tgz",
-          "integrity": "sha1-TkMekrEalzFjaqH5yNHMvP2reN8="
-        },
-        "kind-of": {
-          "version": "6.0.2",
-          "resolved": "https://registry.npmjs.org/kind-of/-/kind-of-6.0.2.tgz",
-          "integrity": "sha512-s5kLOcnH0XqDO+FvuaLX8DDjZ18CGFk7VygH40QoKPUQhW4e2rvM0rwUq0t8IQDOwYSeLK01U90OjzBTme2QqA=="
         }
       }
     },
     "binary-extensions": {
-      "version": "1.13.0",
-      "resolved": "https://registry.npmjs.org/binary-extensions/-/binary-extensions-1.13.0.tgz",
-      "integrity": "sha512-EgmjVLMn22z7eGGv3kcnHwSnJXmFHjISTY9E/S5lIcTD3Oxw05QTcBLNkJFzcb3cNueUdF/IN4U+d78V0zO8Hw=="
+      "version": "1.13.1",
+      "resolved": "https://registry.npmjs.org/binary-extensions/-/binary-extensions-1.13.1.tgz",
+      "integrity": "sha512-Un7MIEDdUC5gNpcGDV97op1Ywk748MpHcFTHoYs6qnj1Z3j7I53VG3nwZhKzoBZmbdRNnb6WRdFlwl7tSDuZGw=="
     },
     "boxen": {
-      "version": "1.3.0",
-      "resolved": "https://registry.npmjs.org/boxen/-/boxen-1.3.0.tgz",
-      "integrity": "sha512-TNPjfTr432qx7yOjQyaXm3dSR0MH9vXp7eT1BFSl/C51g+EFnOR9hTg1IreahGBmDNCehscshe45f+C1TBZbLw==",
-      "requires": {
-        "ansi-align": "^2.0.0",
-        "camelcase": "^4.0.0",
-        "chalk": "^2.0.1",
-        "cli-boxes": "^1.0.0",
-        "string-width": "^2.0.0",
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/boxen/-/boxen-3.2.0.tgz",
+      "integrity": "sha512-cU4J/+NodM3IHdSL2yN8bqYqnmlBTidDR4RC7nJs61ZmtGz8VZzM3HLQX0zY5mrSmPtR3xWwsq2jOUQqFZN8+A==",
+      "requires": {
+        "ansi-align": "^3.0.0",
+        "camelcase": "^5.3.1",
+        "chalk": "^2.4.2",
+        "cli-boxes": "^2.2.0",
+        "string-width": "^3.0.0",
         "term-size": "^1.2.0",
+        "type-fest": "^0.3.0",
         "widest-line": "^2.0.0"
       },
       "dependencies": {
-        "ansi-styles": {
-          "version": "3.2.1",
-          "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
-          "integrity": "sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==",
-          "requires": {
-            "color-convert": "^1.9.0"
-          }
+        "ansi-regex": {
+          "version": "4.1.0",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
+          "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg=="
         },
-        "chalk": {
-          "version": "2.4.2",
-          "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.2.tgz",
-          "integrity": "sha512-Mti+f9lpJNcwF4tWV8/OrTTtF1gZi+f8FqlyAdouralcFWFQWF2+NgCHShjkCb+IFBLq9buZwE1xckQU4peSuQ==",
+        "string-width": {
+          "version": "3.1.0",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
+          "integrity": "sha512-vafcv6KjVZKSgz06oM/H6GDBrAtz8vdhQakGjFIvNrHA6y3HCF1CInLy+QLq8dTJPQ1b+KDUqDFctkdRW44e1w==",
           "requires": {
-            "ansi-styles": "^3.2.1",
-            "escape-string-regexp": "^1.0.5",
-            "supports-color": "^5.3.0"
+            "emoji-regex": "^7.0.1",
+            "is-fullwidth-code-point": "^2.0.0",
+            "strip-ansi": "^5.1.0"
           }
         },
-        "supports-color": {
-          "version": "5.5.0",
-          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.5.0.tgz",
-          "integrity": "sha512-QjVjwdXIt408MIiAqCX4oUKsgU2EqAGzs2Ppkm4aQYbjm+ZEWEcW4SfFNTr4uMNZma0ey4f5lgLrkB0aX0QMow==",
+        "strip-ansi": {
+          "version": "5.2.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
+          "integrity": "sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==",
           "requires": {
-            "has-flag": "^3.0.0"
+            "ansi-regex": "^4.1.0"
           }
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       }
@@ -285,21 +324,32 @@
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     "braces": {
-      "version": "1.8.5",
-      "resolved": "https://registry.npmjs.org/braces/-/braces-1.8.5.tgz",
-      "integrity": "sha1-uneWLhLf+WnWt2cR6RS3N4V79qc=",
+      "version": "2.3.2",
+      "resolved": "https://registry.npmjs.org/braces/-/braces-2.3.2.tgz",
+      "integrity": "sha512-aNdbnj9P8PjdXU4ybaWLK2IF3jc/EoDYbC7AazW6to3TRsfXxscC9UXOB5iDiEQrkyIbWp2SLQda4+QAa7nc3w==",
       "requires": {
-        "expand-range": "^1.8.1",
-        "preserve": "^0.2.0",
-        "repeat-element": "^1.1.2"
+        "arr-flatten": "^1.1.0",
+        "array-unique": "^0.3.2",
+        "extend-shallow": "^2.0.1",
+        "fill-range": "^4.0.0",
+        "isobject": "^3.0.1",
+        "repeat-element": "^1.1.2",
+        "snapdragon": "^0.8.1",
+        "snapdragon-node": "^2.0.1",
+        "split-string": "^3.0.2",
+        "to-regex": "^3.0.1"
+      },
+      "dependencies": {
+        "extend-shallow": {
+          "version": "2.0.1",
+          "resolved": "https://registry.npmjs.org/extend-shallow/-/extend-shallow-2.0.1.tgz",
+          "integrity": "sha1-Ua99YUrZqfYQ6huvu5idaxxWiQ8=",
+          "requires": {
+            "is-extendable": "^0.1.0"
+          }
+        }
       }
     },
-    "buffer-from": {
-      "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/buffer-from/-/buffer-from-1.1.1.tgz",
-      "integrity": "sha512-MQcXEUbCKtEo7bhqEs6560Hyd4XaovZlO/k9V3hjVUF/zwW7KBVdSK4gIt/bzwS9MbR5qob+F5jusZsb0YQK2A==",
-      "dev": true
-    },
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+            "strip-ansi": "^5.1.0"
           }
         },
-        "string-width": {
-          "version": "1.0.2",
-          "resolved": "https://registry.npmjs.org/string-width/-/string-width-1.0.2.tgz",
-          "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
+        "strip-ansi": {
+          "version": "5.2.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
+          "integrity": "sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==",
           "requires": {
-            "code-point-at": "^1.0.0",
-            "is-fullwidth-code-point": "^1.0.0",
-            "strip-ansi": "^3.0.0"
+            "ansi-regex": "^4.1.0"
           }
         }
       }
     },
     "yargs-parser": {
-      "version": "5.0.0",
-      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-5.0.0.tgz",
-      "integrity": "sha1-J17PDX/+Bcd+ZOfIbkzZS/DhIoo=",
+      "version": "15.0.0",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-15.0.0.tgz",
+      "integrity": "sha512-xLTUnCMc4JhxrPEPUYD5IBR1mWCK/aT6+RJ/K29JY2y1vD+FhtgKK0AXRWvI262q3QSffAQuTouFIKUuHX89wQ==",
       "requires": {
-        "camelcase": "^3.0.0"
-      },
-      "dependencies": {
-        "camelcase": {
-          "version": "3.0.0",
-          "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-3.0.0.tgz",
-          "integrity": "sha1-MvxLn82vhF/N9+c7uXysImHwqwo="
-        }
+        "camelcase": "^5.0.0",
+        "decamelize": "^1.2.0"
       }
     }
   }
diff --git a/package.json b/package.json
index e8539ec..1645d03 100644
--- a/package.json
+++ b/package.json
@@ -14,8 +14,8 @@
   },
   "license": "MIT",
   "engines": {
-    "node": ">= 4",
-    "npm": ">= 3"
+    "node": ">= 8",
+    "npm": ">= 5"
   },
   "main": "bin/docsify",
   "bin": {
@@ -27,28 +27,25 @@
     "tools/locales"
   ],
   "dependencies": {
-    "chalk": "^1.1.3",
+    "chalk": "^2.4.2",
     "connect": "^3.6.0",
     "connect-livereload": "^0.6.0",
-    "cp-file": "^4.1.1",
+    "cp-file": "^7.0.0",
     "docsify": ">=3",
     "docsify-server-renderer": ">=4",
-    "fs-extra": "^2.1.2",
-    "get-port": "^4.1.0",
-    "livereload": "^0.7.0",
-    "lru-cache": "^4.1.1",
-    "opn": "^5.3.0",
+    "fs-extra": "^8.1.0",
+    "get-port": "^5.0.0",
+    "livereload": "^0.8.2",
+    "lru-cache": "^5.1.1",
+    "open": "^6.4.0",
     "serve-static": "^1.12.1",
-    "update-notifier": "^2.1.0",
-    "y18n": "^3.2.1",
+    "update-notifier": "^3.0.1",
     "yargonaut": "^1.1.2",
-    "yargs": "^7.0.2"
+    "yargs": "^14.2.0"
   },
   "devDependencies": {
-    "chalk": "^1.1.3",
     "cors": "^2.8.1",
-    "eslint": "^4.18.2",
-    "yargs": "^7.0.2"
+    "eslint": "^6.5.1"
   },
   "keywords": [
     "docsify",