diff --git a/package-lock.json b/package-lock.json
index d114e53..9e1085d 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -2,6 +2,7 @@
   "name": "chai-as-promised",
   "version": "7.1.1",
   "lockfileVersion": 1,
+  "requires": true,
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@@ -20,6 +21,9 @@
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       "integrity": "sha1-r9+UiPsezvyDSPb7IvRk4ypYs2s=",
       "dev": true,
+      "requires": {
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@@ -33,19 +37,30 @@
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       "integrity": "sha1-gv+wKynmYq5TvcIK8VlHcGc5xTY=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "co": "^4.6.0",
+        "json-stable-stringify": "^1.0.1"
+      }
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       "resolved": "https://registry.npmjs.org/ajv-keywords/-/ajv-keywords-1.5.1.tgz",
       "integrity": "sha1-MU3QpLM2j609/NxU7eYXG4htrzw=",
-      "dev": true
+      "dev": true,
+      "requires": {}
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       "resolved": "https://registry.npmjs.org/align-text/-/align-text-0.1.4.tgz",
       "integrity": "sha1-DNkKVhCT810KmSVsIrcGlDP60Rc=",
-      "dev": true
+      "dev": true,
+      "optional": true,
+      "requires": {
+        "kind-of": "^3.0.2",
+        "longest": "^1.0.1",
+        "repeat-string": "^1.5.2"
+      }
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@@ -75,13 +90,19 @@
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       "integrity": "sha1-c9g7wmP4bpf4zE9rrhsOkKfSLIY=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "sprintf-js": "~1.0.2"
+      }
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       "resolved": "https://registry.npmjs.org/array-union/-/array-union-1.0.2.tgz",
       "integrity": "sha1-mjRBDk9OPaI96jdb5b5w8kd47Dk=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "array-uniq": "^1.0.1"
+      }
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@@ -111,7 +132,12 @@
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       "integrity": "sha1-AnYgvuVnqIwyVhV05/0IAdMxGOQ=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "chalk": "^1.1.0",
+        "esutils": "^2.0.2",
+        "js-tokens": "^3.0.0"
+      }
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@@ -123,7 +149,11 @@
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       "integrity": "sha1-wHshHHyVLsH479Uad+8NHTmQopI=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "balanced-match": "^1.0.0",
+        "concat-map": "0.0.1"
+      }
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@@ -135,7 +165,10 @@
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       "integrity": "sha1-lAhe9jWB7NPaqSREqP6U6CV3dR8=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "callsites": "^0.2.0"
+      }
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@@ -155,19 +188,38 @@
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       "integrity": "sha1-qg0yYptu6XIgBBHL1EYckHvCt60=",
       "dev": true,
-      "optional": true
+      "optional": true,
+      "requires": {
+        "align-text": "^0.1.3",
+        "lazy-cache": "^1.0.3"
+      }
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     "chai": {
       "version": "4.0.2",
       "resolved": "https://registry.npmjs.org/chai/-/chai-4.0.2.tgz",
       "integrity": "sha1-L3MnxN5vOF3XeHmZ4qsCaXoyuDs=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "assertion-error": "^1.0.1",
+        "check-error": "^1.0.1",
+        "deep-eql": "^2.0.1",
+        "get-func-name": "^2.0.0",
+        "pathval": "^1.0.0",
+        "type-detect": "^4.0.0"
+      }
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     "chalk": {
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       "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
       "integrity": "sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "ansi-styles": "^2.2.1",
+        "escape-string-regexp": "^1.0.2",
+        "has-ansi": "^2.0.0",
+        "strip-ansi": "^3.0.0",
+        "supports-color": "^2.0.0"
+      }
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@@ -184,7 +236,10 @@
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       "integrity": "sha1-ZNo/fValRBLll5S9Ytw1KV6PKYc=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "restore-cursor": "^1.0.1"
+      }
     },
     "cli-width": {
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@@ -198,6 +253,11 @@
       "integrity": "sha1-S0dXYP+AJkx2LDoXGQMukcf+oNE=",
       "dev": true,
       "optional": true,
+      "requires": {
+        "center-align": "^0.1.1",
+        "right-align": "^0.1.1",
+        "wordwrap": "0.0.2"
+      },
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@@ -224,7 +284,10 @@
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       "integrity": "sha1-nJkJQXbhIkDLItbFFGCYQA/g99Q=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "graceful-readlink": ">= 1.0.0"
+      }
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@@ -236,7 +299,12 @@
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       "integrity": "sha1-CqxmL9Ur54lk1VMvaUeE5wEQrPc=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "inherits": "^2.0.3",
+        "readable-stream": "^2.2.2",
+        "typedarray": "^0.0.6"
+      }
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@@ -248,13 +316,19 @@
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       "integrity": "sha1-dUu1v+VUUdpppYuU1F9MWwRi1Y8=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "es5-ext": "^0.10.9"
+      }
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     "debug": {
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       "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.8.tgz",
       "integrity": "sha1-5zFTHKLt4n0YgiJCfaF4IdaP9Pw=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "ms": "2.0.0"
+      }
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@@ -268,6 +342,9 @@
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       "integrity": "sha1-sbrAblbwp2d3aG1Qyf63XC7XZ5o=",
       "dev": true,
+      "requires": {
+        "type-detect": "^3.0.0"
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@@ -287,7 +364,16 @@
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       "integrity": "sha1-wSyYHQZ4RshLyvhiz/kw2Qf/0ag=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "globby": "^5.0.0",
+        "is-path-cwd": "^1.0.0",
+        "is-path-in-cwd": "^1.0.0",
+        "object-assign": "^4.0.1",
+        "pify": "^2.0.0",
+        "pinkie-promise": "^2.0.0",
+        "rimraf": "^2.2.8"
+      }
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@@ -299,43 +385,81 @@
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       "integrity": "sha1-xz2NKQnSIpHhoAejlYBNqLZl/mM=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "esutils": "^2.0.2",
+        "isarray": "^1.0.0"
+      }
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       "integrity": "sha1-dXi1G+l0IHpUh4IbVlOMIk5Oezg=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "es6-iterator": "2",
+        "es6-symbol": "~3.1"
+      }
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       "resolved": "https://registry.npmjs.org/es6-iterator/-/es6-iterator-2.0.1.tgz",
       "integrity": "sha1-jjGcnwRTv1ddN0lAplWSDlnKVRI=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "d": "1",
+        "es5-ext": "^0.10.14",
+        "es6-symbol": "^3.1"
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       "integrity": "sha1-kTbgUD3MBqMBaQ8LsU/042TpSfA=",
-      "dev": true
+      "dev": true,
+      "requires": {
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+        "es5-ext": "~0.10.14",
+        "es6-iterator": "~2.0.1",
+        "es6-set": "~0.1.5",
+        "es6-symbol": "~3.1.1",
+        "event-emitter": "~0.3.5"
+      }
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       "integrity": "sha1-0rPsXU2ADO2BjbU40ol02wpzzLE=",
-      "dev": true
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+      "requires": {
+        "d": "1",
+        "es5-ext": "~0.10.14",
+        "es6-iterator": "~2.0.1",
+        "es6-symbol": "3.1.1",
+        "event-emitter": "~0.3.5"
+      }
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     "es6-symbol": {
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       "resolved": "https://registry.npmjs.org/es6-symbol/-/es6-symbol-3.1.1.tgz",
       "integrity": "sha1-vwDvT9q2uhtG7Le2KbTH7VcVzHc=",
-      "dev": true
+      "dev": true,
+      "requires": {
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+        "es5-ext": "~0.10.14"
+      }
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       "integrity": "sha1-XjqzIlH/0VOKH45f+hNXdy+S2W8=",
-      "dev": true
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+      "requires": {
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+        "es5-ext": "^0.10.14",
+        "es6-iterator": "^2.0.1",
+        "es6-symbol": "^3.1.1"
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@@ -348,6 +472,13 @@
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       "integrity": "sha1-WltTr0aTEQvrsIZ6o0MN07cKEBg=",
       "dev": true,
+      "requires": {
+        "esprima": "^2.7.1",
+        "estraverse": "^1.9.1",
+        "esutils": "^2.0.2",
+        "optionator": "^0.8.1",
+        "source-map": "~0.2.0"
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@@ -367,19 +498,66 @@
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-      "dev": true
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+      "requires": {
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+        "es6-weak-map": "^2.0.1",
+        "esrecurse": "^4.1.0",
+        "estraverse": "^4.1.1"
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       "integrity": "sha1-yPxiAcf0DdCJQbh8CFdnOGpnmsw=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "babel-code-frame": "^6.16.0",
+        "chalk": "^1.1.3",
+        "concat-stream": "^1.5.2",
+        "debug": "^2.1.1",
+        "doctrine": "^2.0.0",
+        "escope": "^3.6.0",
+        "espree": "^3.4.0",
+        "esquery": "^1.0.0",
+        "estraverse": "^4.2.0",
+        "esutils": "^2.0.2",
+        "file-entry-cache": "^2.0.0",
+        "glob": "^7.0.3",
+        "globals": "^9.14.0",
+        "ignore": "^3.2.0",
+        "imurmurhash": "^0.1.4",
+        "inquirer": "^0.12.0",
+        "is-my-json-valid": "^2.10.0",
+        "is-resolvable": "^1.0.0",
+        "js-yaml": "^3.5.1",
+        "json-stable-stringify": "^1.0.0",
+        "levn": "^0.3.0",
+        "lodash": "^4.0.0",
+        "mkdirp": "^0.5.0",
+        "natural-compare": "^1.4.0",
+        "optionator": "^0.8.2",
+        "path-is-inside": "^1.0.1",
+        "pluralize": "^1.2.1",
+        "progress": "^1.1.8",
+        "require-uncached": "^1.0.2",
+        "shelljs": "^0.7.5",
+        "strip-bom": "^3.0.0",
+        "strip-json-comments": "~2.0.1",
+        "table": "^3.7.8",
+        "text-table": "~0.2.0",
+        "user-home": "^2.0.0"
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       "integrity": "sha1-KRC1zNSc6JPC//+qtP2LOjG4I3Q=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "acorn": "^5.0.1",
+        "acorn-jsx": "^3.0.0"
+      }
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@@ -391,13 +569,20 @@
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-      "dev": true
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+      "requires": {
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       "resolved": "https://registry.npmjs.org/esrecurse/-/esrecurse-4.2.0.tgz",
       "integrity": "sha1-+pVo2Y04I/mkHZHpAtyrnqblsWM=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "estraverse": "^4.1.0",
+        "object-assign": "^4.0.1"
+      }
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@@ -415,7 +600,11 @@
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-      "dev": true
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+      "requires": {
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+      }
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@@ -433,19 +622,33 @@
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-      "dev": true
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+      "requires": {
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+        "object-assign": "^4.1.0"
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       "integrity": "sha1-w5KZDD5oR4PYOLjISkXYoEhFg2E=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "flat-cache": "^1.2.1",
+        "object-assign": "^4.0.1"
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       "integrity": "sha1-+oZxTnLCHbiGAXYezy9VXRq8a5Y=",
-      "dev": true
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+      "requires": {
+        "circular-json": "^0.3.1",
+        "del": "^2.0.2",
+        "graceful-fs": "^4.1.2",
+        "write": "^0.2.1"
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@@ -463,7 +666,10 @@
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-      "dev": true
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@@ -475,7 +681,15 @@
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-      "dev": true
+      "dev": true,
+      "requires": {
+        "fs.realpath": "^1.0.0",
+        "inflight": "^1.0.4",
+        "inherits": "2",
+        "minimatch": "^3.0.4",
+        "once": "^1.3.0",
+        "path-is-absolute": "^1.0.0"
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-      "dev": true
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+      "requires": {
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+        "arrify": "^1.0.0",
+        "glob": "^7.0.3",
+        "object-assign": "^4.0.1",
+        "pify": "^2.0.0",
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@@ -512,12 +734,21 @@
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       "integrity": "sha1-PTDHGLCaPZbyPqTMH0A8TTup/08=",
       "dev": true,
+      "requires": {
+        "async": "^1.4.0",
+        "optimist": "^0.6.1",
+        "source-map": "^0.4.4",
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           "integrity": "sha1-66T12pwNyZneaAMti092FzZSA2s=",
-          "dev": true
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@@ -525,7 +756,10 @@
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-      "dev": true
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+        "chalk": "^1.1.1",
+        "lodash": "^4.0.0",
+        "slice-ansi": "0.0.4",
+        "string-width": "^2.0.0"
+      },
       "dependencies": {
         "ansi-regex": {
           "version": "3.0.0",
@@ -1134,13 +1581,20 @@
           "version": "2.1.0",
           "resolved": "https://registry.npmjs.org/string-width/-/string-width-2.1.0.tgz",
           "integrity": "sha1-AwZkVh/BRslCPsfZeP4kV0N/5tA=",
-          "dev": true
+          "dev": true,
+          "requires": {
+            "is-fullwidth-code-point": "^2.0.0",
+            "strip-ansi": "^4.0.0"
+          }
         },
         "strip-ansi": {
           "version": "4.0.0",
           "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-4.0.0.tgz",
           "integrity": "sha1-qEeQIusaw2iocTibY1JixQXuNo8=",
-          "dev": true
+          "dev": true,
+          "requires": {
+            "ansi-regex": "^3.0.0"
+          }
         }
       }
     },
@@ -1166,7 +1620,10 @@
       "version": "0.3.2",
       "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.3.2.tgz",
       "integrity": "sha1-WITKtRLPHTVeP7eE8wgEsrUg23I=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "prelude-ls": "~1.1.2"
+      }
     },
     "type-detect": {
       "version": "4.0.3",
@@ -1186,6 +1643,11 @@
       "integrity": "sha1-KcVzMUgFe7Th913zW3qcty5qWd0=",
       "dev": true,
       "optional": true,
+      "requires": {
+        "source-map": "~0.5.1",
+        "uglify-to-browserify": "~1.0.0",
+        "yargs": "~3.10.0"
+      },
       "dependencies": {
         "source-map": {
           "version": "0.5.6",
@@ -1207,7 +1669,10 @@
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/user-home/-/user-home-2.0.0.tgz",
       "integrity": "sha1-nHC/2Babwdy/SGBODwS4tJzenp8=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "os-homedir": "^1.0.0"
+      }
     },
     "util-deprecate": {
       "version": "1.0.2",
@@ -1219,7 +1684,10 @@
       "version": "1.2.14",
       "resolved": "https://registry.npmjs.org/which/-/which-1.2.14.tgz",
       "integrity": "sha1-mofEN48D6CfOyvGs31bHNsAcFOU=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "isexe": "^2.0.0"
+      }
     },
     "window-size": {
       "version": "0.1.0",
@@ -1244,7 +1712,10 @@
       "version": "0.2.1",
       "resolved": "https://registry.npmjs.org/write/-/write-0.2.1.tgz",
       "integrity": "sha1-X8A4KOJkzqP+kUVUdvejxWbLB1c=",
-      "dev": true
+      "dev": true,
+      "requires": {
+        "mkdirp": "^0.5.1"
+      }
     },
     "xtend": {
       "version": "4.0.1",
@@ -1257,7 +1728,13 @@
       "resolved": "https://registry.npmjs.org/yargs/-/yargs-3.10.0.tgz",
       "integrity": "sha1-9+572FfdfB0tOMDnTvvWgdFDH9E=",
       "dev": true,
-      "optional": true
+      "optional": true,
+      "requires": {
+        "camelcase": "^1.0.2",
+        "cliui": "^2.1.0",
+        "decamelize": "^1.0.0",
+        "window-size": "0.1.0"
+      }
     }
   }
 }
diff --git a/package.json b/package.json
index 3c4cda9..3352092 100644
--- a/package.json
+++ b/package.json
@@ -29,7 +29,7 @@
     "check-error": "^1.0.2"
   },
   "peerDependencies": {
-    "chai": ">= 2.1.2 < 5"
+    "chai": ">= 2.1.2 < 6"
   },
   "devDependencies": {
     "chai": "^4.0.2",