diff --git a/node_modules/graceful-fs/fs.js b/node_modules/graceful-fs/clone.js
similarity index 88%
rename from node_modules/graceful-fs/fs.js
rename to node_modules/graceful-fs/clone.js
index 8ad4a383965b..028356c96ed5 100644
--- a/node_modules/graceful-fs/fs.js
+++ b/node_modules/graceful-fs/clone.js
@@ -1,8 +1,6 @@
 'use strict'
 
-var fs = require('fs')
-
-module.exports = clone(fs)
+module.exports = clone
 
 function clone (obj) {
   if (obj === null || typeof obj !== 'object')
diff --git a/node_modules/graceful-fs/graceful-fs.js b/node_modules/graceful-fs/graceful-fs.js
index 33b30d2e986e..ac206757e63c 100644
--- a/node_modules/graceful-fs/graceful-fs.js
+++ b/node_modules/graceful-fs/graceful-fs.js
@@ -1,6 +1,8 @@
 var fs = require('fs')
 var polyfills = require('./polyfills.js')
 var legacy = require('./legacy-streams.js')
+var clone = require('./clone.js')
+
 var queue = []
 
 var util = require('util')
@@ -24,17 +26,17 @@ if (/\bgfs4\b/i.test(process.env.NODE_DEBUG || '')) {
   })
 }
 
-module.exports = patch(require('./fs.js'))
-if (process.env.TEST_GRACEFUL_FS_GLOBAL_PATCH) {
-  module.exports = patch(fs)
+module.exports = patch(clone(fs))
+if (process.env.TEST_GRACEFUL_FS_GLOBAL_PATCH && !fs.__patched) {
+    module.exports = patch(fs)
+    fs.__patched = true;
 }
 
 // Always patch fs.close/closeSync, because we want to
 // retry() whenever a close happens *anywhere* in the program.
 // This is essential when multiple graceful-fs instances are
 // in play at the same time.
-module.exports.close =
-fs.close = (function (fs$close) { return function (fd, cb) {
+module.exports.close = (function (fs$close) { return function (fd, cb) {
   return fs$close.call(fs, fd, function (err) {
     if (!err)
       retry()
@@ -44,8 +46,7 @@ fs.close = (function (fs$close) { return function (fd, cb) {
   })
 }})(fs.close)
 
-module.exports.closeSync =
-fs.closeSync = (function (fs$closeSync) { return function (fd) {
+module.exports.closeSync = (function (fs$closeSync) { return function (fd) {
   // Note that graceful-fs also retries when fs.closeSync() fails.
   // Looks like a bug to me, although it's probably a harmless one.
   var rval = fs$closeSync.apply(fs, arguments)
@@ -53,6 +54,17 @@ fs.closeSync = (function (fs$closeSync) { return function (fd) {
   return rval
 }})(fs.closeSync)
 
+// Only patch fs once, otherwise we'll run into a memory leak if
+// graceful-fs is loaded multiple times, such as in test environments that
+// reset the loaded modules between tests.
+// We look for the string `graceful-fs` from the comment above. This
+// way we are not adding any extra properties and it will detect if older
+// versions of graceful-fs are installed.
+if (!/\bgraceful-fs\b/.test(fs.closeSync.toString())) {
+  fs.closeSync = module.exports.closeSync;
+  fs.close = module.exports.close;
+}
+
 function patch (fs) {
   // Everything that references the open() function needs to be in here
   polyfills(fs)
@@ -144,6 +156,7 @@ function patch (fs) {
 
       if (err && (err.code === 'EMFILE' || err.code === 'ENFILE'))
         enqueue([go$readdir, [args]])
+
       else {
         if (typeof cb === 'function')
           cb.apply(this, arguments)
@@ -163,12 +176,16 @@ function patch (fs) {
   }
 
   var fs$ReadStream = fs.ReadStream
-  ReadStream.prototype = Object.create(fs$ReadStream.prototype)
-  ReadStream.prototype.open = ReadStream$open
+  if (fs$ReadStream) {
+    ReadStream.prototype = Object.create(fs$ReadStream.prototype)
+    ReadStream.prototype.open = ReadStream$open
+  }
 
   var fs$WriteStream = fs.WriteStream
-  WriteStream.prototype = Object.create(fs$WriteStream.prototype)
-  WriteStream.prototype.open = WriteStream$open
+  if (fs$WriteStream) {
+    WriteStream.prototype = Object.create(fs$WriteStream.prototype)
+    WriteStream.prototype.open = WriteStream$open
+  }
 
   fs.ReadStream = ReadStream
   fs.WriteStream = WriteStream
diff --git a/node_modules/graceful-fs/package.json b/node_modules/graceful-fs/package.json
index d5b0bf01db55..a17913f22104 100644
--- a/node_modules/graceful-fs/package.json
+++ b/node_modules/graceful-fs/package.json
@@ -1,27 +1,22 @@
 {
-  "_args": [
-    [
-      "graceful-fs@4.1.11",
-      "/Users/rebecca/code/npm"
-    ]
-  ],
-  "_from": "graceful-fs@4.1.11",
-  "_id": "graceful-fs@4.1.11",
+  "_from": "graceful-fs@4.1.15",
+  "_id": "graceful-fs@4.1.15",
   "_inBundle": false,
-  "_integrity": "sha1-Dovf5NHduIVNZOBOp8AOKgJuVlg=",
+  "_integrity": "sha512-6uHUhOPEBgQ24HM+r6b/QwWfZq+yiFcipKFrOFiBEnWdy5sdzYoi+pJeQaPI5qOLRFqWmAXUPQNsielzdLoecA==",
   "_location": "/graceful-fs",
   "_phantomChildren": {},
   "_requested": {
     "type": "version",
     "registry": true,
-    "raw": "graceful-fs@4.1.11",
+    "raw": "graceful-fs@4.1.15",
     "name": "graceful-fs",
     "escapedName": "graceful-fs",
-    "rawSpec": "4.1.11",
+    "rawSpec": "4.1.15",
     "saveSpec": null,
-    "fetchSpec": "4.1.11"
+    "fetchSpec": "4.1.15"
   },
   "_requiredBy": [
+    "#USER",
     "/",
     "/bin-links",
     "/cacache",
@@ -36,7 +31,6 @@
     "/load-json-file",
     "/node-gyp",
     "/npm-lifecycle",
-    "/npm-profile/cacache",
     "/npm-registry-client",
     "/npm-registry-fetch/cacache",
     "/pkg-conf/load-json-file",
@@ -45,32 +39,33 @@
     "/read-package-json",
     "/readdir-scoped-modules",
     "/sha",
-    "/tacks",
     "/write-file-atomic"
   ],
-  "_resolved": "https://registry.npmjs.org/graceful-fs/-/graceful-fs-4.1.11.tgz",
-  "_spec": "4.1.11",
-  "_where": "/Users/rebecca/code/npm",
+  "_resolved": "https://registry.npmjs.org/graceful-fs/-/graceful-fs-4.1.15.tgz",
+  "_shasum": "ffb703e1066e8a0eeaa4c8b80ba9253eeefbfb00",
+  "_spec": "graceful-fs@4.1.15",
+  "_where": "/Users/zkat/Documents/code/work/npm",
   "bugs": {
     "url": "https://github.com/isaacs/node-graceful-fs/issues"
   },
+  "bundleDependencies": false,
+  "deprecated": false,
   "description": "A drop-in replacement for fs, making various improvements.",
   "devDependencies": {
+    "import-fresh": "^2.0.0",
     "mkdirp": "^0.5.0",
     "rimraf": "^2.2.8",
-    "tap": "^5.4.2"
+    "tap": "^12.0.1"
   },
   "directories": {
     "test": "test"
   },
-  "engines": {
-    "node": ">=0.4.0"
-  },
   "files": [
     "fs.js",
     "graceful-fs.js",
     "legacy-streams.js",
-    "polyfills.js"
+    "polyfills.js",
+    "clone.js"
   ],
   "homepage": "https://github.com/isaacs/node-graceful-fs#readme",
   "keywords": [
@@ -97,7 +92,10 @@
     "url": "git+https://github.com/isaacs/node-graceful-fs.git"
   },
   "scripts": {
+    "postpublish": "git push origin --all; git push origin --tags",
+    "postversion": "npm publish",
+    "preversion": "npm test",
     "test": "node test.js | tap -"
   },
-  "version": "4.1.11"
+  "version": "4.1.15"
 }
diff --git a/node_modules/graceful-fs/polyfills.js b/node_modules/graceful-fs/polyfills.js
index 4c6aca78a3dc..b964ed0806ce 100644
--- a/node_modules/graceful-fs/polyfills.js
+++ b/node_modules/graceful-fs/polyfills.js
@@ -1,4 +1,3 @@
-var fs = require('./fs.js')
 var constants = require('constants')
 
 var origCwd = process.cwd
@@ -145,73 +144,36 @@ function patch (fs) {
       }
     }
   }})(fs.readSync)
-}
-
-function patchLchmod (fs) {
-  fs.lchmod = function (path, mode, callback) {
-    fs.open( path
-           , constants.O_WRONLY | constants.O_SYMLINK
-           , mode
-           , function (err, fd) {
-      if (err) {
-        if (callback) callback(err)
-        return
-      }
-      // prefer to return the chmod error, if one occurs,
-      // but still try to close, and report closing errors if they occur.
-      fs.fchmod(fd, mode, function (err) {
-        fs.close(fd, function(err2) {
-          if (callback) callback(err || err2)
-        })
-      })
-    })
-  }
-
-  fs.lchmodSync = function (path, mode) {
-    var fd = fs.openSync(path, constants.O_WRONLY | constants.O_SYMLINK, mode)
-
-    // prefer to return the chmod error, if one occurs,
-    // but still try to close, and report closing errors if they occur.
-    var threw = true
-    var ret
-    try {
-      ret = fs.fchmodSync(fd, mode)
-      threw = false
-    } finally {
-      if (threw) {
-        try {
-          fs.closeSync(fd)
-        } catch (er) {}
-      } else {
-        fs.closeSync(fd)
-      }
-    }
-    return ret
-  }
-}
 
-function patchLutimes (fs) {
-  if (constants.hasOwnProperty("O_SYMLINK")) {
-    fs.lutimes = function (path, at, mt, cb) {
-      fs.open(path, constants.O_SYMLINK, function (er, fd) {
-        if (er) {
-          if (cb) cb(er)
+  function patchLchmod (fs) {
+    fs.lchmod = function (path, mode, callback) {
+      fs.open( path
+             , constants.O_WRONLY | constants.O_SYMLINK
+             , mode
+             , function (err, fd) {
+        if (err) {
+          if (callback) callback(err)
           return
         }
-        fs.futimes(fd, at, mt, function (er) {
-          fs.close(fd, function (er2) {
-            if (cb) cb(er || er2)
+        // prefer to return the chmod error, if one occurs,
+        // but still try to close, and report closing errors if they occur.
+        fs.fchmod(fd, mode, function (err) {
+          fs.close(fd, function(err2) {
+            if (callback) callback(err || err2)
           })
         })
       })
     }
 
-    fs.lutimesSync = function (path, at, mt) {
-      var fd = fs.openSync(path, constants.O_SYMLINK)
-      var ret
+    fs.lchmodSync = function (path, mode) {
+      var fd = fs.openSync(path, constants.O_WRONLY | constants.O_SYMLINK, mode)
+
+      // prefer to return the chmod error, if one occurs,
+      // but still try to close, and report closing errors if they occur.
       var threw = true
+      var ret
       try {
-        ret = fs.futimesSync(fd, at, mt)
+        ret = fs.fchmodSync(fd, mode)
         threw = false
       } finally {
         if (threw) {
@@ -224,107 +186,144 @@ function patchLutimes (fs) {
       }
       return ret
     }
+  }
+
+  function patchLutimes (fs) {
+    if (constants.hasOwnProperty("O_SYMLINK")) {
+      fs.lutimes = function (path, at, mt, cb) {
+        fs.open(path, constants.O_SYMLINK, function (er, fd) {
+          if (er) {
+            if (cb) cb(er)
+            return
+          }
+          fs.futimes(fd, at, mt, function (er) {
+            fs.close(fd, function (er2) {
+              if (cb) cb(er || er2)
+            })
+          })
+        })
+      }
+
+      fs.lutimesSync = function (path, at, mt) {
+        var fd = fs.openSync(path, constants.O_SYMLINK)
+        var ret
+        var threw = true
+        try {
+          ret = fs.futimesSync(fd, at, mt)
+          threw = false
+        } finally {
+          if (threw) {
+            try {
+              fs.closeSync(fd)
+            } catch (er) {}
+          } else {
+            fs.closeSync(fd)
+          }
+        }
+        return ret
+      }
 
-  } else {
-    fs.lutimes = function (_a, _b, _c, cb) { if (cb) process.nextTick(cb) }
-    fs.lutimesSync = function () {}
+    } else {
+      fs.lutimes = function (_a, _b, _c, cb) { if (cb) process.nextTick(cb) }
+      fs.lutimesSync = function () {}
+    }
   }
-}
 
-function chmodFix (orig) {
-  if (!orig) return orig
-  return function (target, mode, cb) {
-    return orig.call(fs, target, mode, function (er) {
-      if (chownErOk(er)) er = null
-      if (cb) cb.apply(this, arguments)
-    })
+  function chmodFix (orig) {
+    if (!orig) return orig
+    return function (target, mode, cb) {
+      return orig.call(fs, target, mode, function (er) {
+        if (chownErOk(er)) er = null
+        if (cb) cb.apply(this, arguments)
+      })
+    }
   }
-}
 
-function chmodFixSync (orig) {
-  if (!orig) return orig
-  return function (target, mode) {
-    try {
-      return orig.call(fs, target, mode)
-    } catch (er) {
-      if (!chownErOk(er)) throw er
+  function chmodFixSync (orig) {
+    if (!orig) return orig
+    return function (target, mode) {
+      try {
+        return orig.call(fs, target, mode)
+      } catch (er) {
+        if (!chownErOk(er)) throw er
+      }
     }
   }
-}
 
 
-function chownFix (orig) {
-  if (!orig) return orig
-  return function (target, uid, gid, cb) {
-    return orig.call(fs, target, uid, gid, function (er) {
-      if (chownErOk(er)) er = null
-      if (cb) cb.apply(this, arguments)
-    })
+  function chownFix (orig) {
+    if (!orig) return orig
+    return function (target, uid, gid, cb) {
+      return orig.call(fs, target, uid, gid, function (er) {
+        if (chownErOk(er)) er = null
+        if (cb) cb.apply(this, arguments)
+      })
+    }
   }
-}
 
-function chownFixSync (orig) {
-  if (!orig) return orig
-  return function (target, uid, gid) {
-    try {
-      return orig.call(fs, target, uid, gid)
-    } catch (er) {
-      if (!chownErOk(er)) throw er
+  function chownFixSync (orig) {
+    if (!orig) return orig
+    return function (target, uid, gid) {
+      try {
+        return orig.call(fs, target, uid, gid)
+      } catch (er) {
+        if (!chownErOk(er)) throw er
+      }
     }
   }
-}
 
 
-function statFix (orig) {
-  if (!orig) return orig
-  // Older versions of Node erroneously returned signed integers for
-  // uid + gid.
-  return function (target, cb) {
-    return orig.call(fs, target, function (er, stats) {
-      if (!stats) return cb.apply(this, arguments)
+  function statFix (orig) {
+    if (!orig) return orig
+    // Older versions of Node erroneously returned signed integers for
+    // uid + gid.
+    return function (target, cb) {
+      return orig.call(fs, target, function (er, stats) {
+        if (!stats) return cb.apply(this, arguments)
+        if (stats.uid < 0) stats.uid += 0x100000000
+        if (stats.gid < 0) stats.gid += 0x100000000
+        if (cb) cb.apply(this, arguments)
+      })
+    }
+  }
+
+  function statFixSync (orig) {
+    if (!orig) return orig
+    // Older versions of Node erroneously returned signed integers for
+    // uid + gid.
+    return function (target) {
+      var stats = orig.call(fs, target)
       if (stats.uid < 0) stats.uid += 0x100000000
       if (stats.gid < 0) stats.gid += 0x100000000
-      if (cb) cb.apply(this, arguments)
-    })
+      return stats;
+    }
   }
-}
 
-function statFixSync (orig) {
-  if (!orig) return orig
-  // Older versions of Node erroneously returned signed integers for
-  // uid + gid.
-  return function (target) {
-    var stats = orig.call(fs, target)
-    if (stats.uid < 0) stats.uid += 0x100000000
-    if (stats.gid < 0) stats.gid += 0x100000000
-    return stats;
-  }
-}
+  // ENOSYS means that the fs doesn't support the op. Just ignore
+  // that, because it doesn't matter.
+  //
+  // if there's no getuid, or if getuid() is something other
+  // than 0, and the error is EINVAL or EPERM, then just ignore
+  // it.
+  //
+  // This specific case is a silent failure in cp, install, tar,
+  // and most other unix tools that manage permissions.
+  //
+  // When running as root, or if other types of errors are
+  // encountered, then it's strict.
+  function chownErOk (er) {
+    if (!er)
+      return true
 
-// ENOSYS means that the fs doesn't support the op. Just ignore
-// that, because it doesn't matter.
-//
-// if there's no getuid, or if getuid() is something other
-// than 0, and the error is EINVAL or EPERM, then just ignore
-// it.
-//
-// This specific case is a silent failure in cp, install, tar,
-// and most other unix tools that manage permissions.
-//
-// When running as root, or if other types of errors are
-// encountered, then it's strict.
-function chownErOk (er) {
-  if (!er)
-    return true
-
-  if (er.code === "ENOSYS")
-    return true
-
-  var nonroot = !process.getuid || process.getuid() !== 0
-  if (nonroot) {
-    if (er.code === "EINVAL" || er.code === "EPERM")
+    if (er.code === "ENOSYS")
       return true
-  }
 
-  return false
+    var nonroot = !process.getuid || process.getuid() !== 0
+    if (nonroot) {
+      if (er.code === "EINVAL" || er.code === "EPERM")
+        return true
+    }
+
+    return false
+  }
 }
diff --git a/package-lock.json b/package-lock.json
index b583cfa77b98..fb77e81c2c1c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1869,9 +1869,9 @@
       }
     },
     "graceful-fs": {
-      "version": "4.1.11",
-      "resolved": "https://registry.npmjs.org/graceful-fs/-/graceful-fs-4.1.11.tgz",
-      "integrity": "sha1-Dovf5NHduIVNZOBOp8AOKgJuVlg="
+      "version": "4.1.15",
+      "resolved": "https://registry.npmjs.org/graceful-fs/-/graceful-fs-4.1.15.tgz",
+      "integrity": "sha512-6uHUhOPEBgQ24HM+r6b/QwWfZq+yiFcipKFrOFiBEnWdy5sdzYoi+pJeQaPI5qOLRFqWmAXUPQNsielzdLoecA=="
     },
     "har-schema": {
       "version": "2.0.0",
diff --git a/package.json b/package.json
index 6335ee573909..70aa340ea780 100644
--- a/package.json
+++ b/package.json
@@ -61,7 +61,7 @@
     "fs-write-stream-atomic": "~1.0.10",
     "gentle-fs": "^2.0.1",
     "glob": "^7.1.3",
-    "graceful-fs": "~4.1.11",
+    "graceful-fs": "^4.1.15",
     "has-unicode": "~2.0.1",
     "hosted-git-info": "^2.7.1",
     "iferr": "^1.0.2",