diff --git a/package-lock.json b/package-lock.json
index 37b5a3c..a367510 100644
--- a/package-lock.json
+++ b/package-lock.json
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-      "integrity": "sha512-ZP36TMrK9euEuWQYBig9W55WPC7uo37qzAEmbjHz4gfyuXrEUgF8cUvQVO+w+d3OMfPvSRQJ22lSm8MQJ43LTA==",
-      "dev": true,
-      "requires": {
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-      }
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-    "should-format": {
-      "version": "3.0.3",
-      "resolved": "https://registry.npmjs.org/should-format/-/should-format-3.0.3.tgz",
-      "integrity": "sha1-m/yPdPo5IFxT04w01xcwPidxJPE=",
-      "dev": true,
-      "requires": {
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-        "should-type-adaptors": "^1.0.1"
-      }
-    },
-    "should-type": {
-      "version": "1.4.0",
-      "resolved": "https://registry.npmjs.org/should-type/-/should-type-1.4.0.tgz",
-      "integrity": "sha1-B1bYzoRt/QmEOmlHcZ36DUz/XPM=",
-      "dev": true
-    },
-    "should-type-adaptors": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/should-type-adaptors/-/should-type-adaptors-1.1.0.tgz",
-      "integrity": "sha512-JA4hdoLnN+kebEp2Vs8eBe9g7uy0zbRo+RMcU0EsNy+R+k049Ki+N5tT5Jagst2g7EAja+euFuoXFCa8vIklfA==",
-      "dev": true,
-      "requires": {
-        "should-type": "^1.3.0",
-        "should-util": "^1.0.0"
-      }
-    },
-    "should-util": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/should-util/-/should-util-1.0.1.tgz",
-      "integrity": "sha512-oXF8tfxx5cDk8r2kYqlkUJzZpDBqVY/II2WhvU0n9Y3XYvAYRmeaf1PvvIvTgPnv4KJ+ES5M0PyDq5Jp+Ygy2g==",
-      "dev": true
-    },
-    "signal-exit": {
-      "version": "3.0.5",
-      "resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-3.0.5.tgz",
-      "integrity": "sha512-KWcOiKeQj6ZyXx7zq4YxSMgHRlod4czeBQZrPb8OKcohcqAXShm7E20kEMle9WBt26hFcAf0qLOcp5zmY7kOqQ==",
-      "dev": true
-    },
     "sinon": {
       "version": "7.5.0",
       "resolved": "https://registry.npmjs.org/sinon/-/sinon-7.5.0.tgz",
@@ -1593,69 +590,17 @@
         }
       }
     },
-    "source-map": {
-      "version": "0.5.7",
-      "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.5.7.tgz",
-      "integrity": "sha1-igOdLRAh0i0eoUyA2OpGi6LvP8w=",
-      "dev": true
-    },
-    "spawn-wrap": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/spawn-wrap/-/spawn-wrap-2.0.0.tgz",
-      "integrity": "sha512-EeajNjfN9zMnULLwhZZQU3GWBoFNkbngTUPfaawT4RkMiviTxcX0qfhVbGey39mfctfDHkWtuecgQ8NJcyQWHg==",
-      "dev": true,
-      "requires": {
-        "foreground-child": "^2.0.0",
-        "is-windows": "^1.0.2",
-        "make-dir": "^3.0.0",
-        "rimraf": "^3.0.0",
-        "signal-exit": "^3.0.2",
-        "which": "^2.0.1"
-      }
-    },
-    "sprintf-js": {
-      "version": "1.0.3",
-      "resolved": "https://registry.npmjs.org/sprintf-js/-/sprintf-js-1.0.3.tgz",
-      "integrity": "sha1-BOaSb2YolTVPPdAVIDYzuFcpfiw=",
-      "dev": true
-    },
     "statuses": {
       "version": "1.5.0",
       "resolved": "https://registry.npmjs.org/statuses/-/statuses-1.5.0.tgz",
       "integrity": "sha1-Fhx9rBd2Wf2YEfQ3cfqZOBR4Yow="
     },
-    "string-width": {
-      "version": "4.2.3",
-      "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.3.tgz",
-      "integrity": "sha512-wKyQRQpjJ0sIp62ErSZdGsjMJWsap5oRNihHhu6G7JVO/9jIB6UyevL+tXuOqrng8j/cxKTWyWUwvSTriiZz/g==",
-      "dev": true,
-      "requires": {
-        "emoji-regex": "^8.0.0",
-        "is-fullwidth-code-point": "^3.0.0",
-        "strip-ansi": "^6.0.1"
-      }
-    },
     "string_decoder": {
       "version": "0.10.31",
       "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-0.10.31.tgz",
       "integrity": "sha1-YuIDvEF2bGwoyfyEMB2rHFMQ+pQ=",
       "dev": true
     },
-    "strip-ansi": {
-      "version": "6.0.1",
-      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.1.tgz",
-      "integrity": "sha512-Y38VPSHcqkFrCpFnQ9vuSXmquuv5oXOKpGeT6aGrr3o3Gc9AlVa6JBfUSOCnbxGGZF+/0ooI7KrPuUSztUdU5A==",
-      "dev": true,
-      "requires": {
-        "ansi-regex": "^5.0.1"
-      }
-    },
-    "strip-bom": {
-      "version": "4.0.0",
-      "resolved": "https://registry.npmjs.org/strip-bom/-/strip-bom-4.0.0.tgz",
-      "integrity": "sha512-3xurFv5tEgii33Zi8Jtp55wEIILR9eh34FAW00PZf+JnSsTmV/ioewSgQl97JHvgjoRGwPShsWm+IdrxB35d0w==",
-      "dev": true
-    },
     "strip-json-comments": {
       "version": "1.0.4",
       "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-1.0.4.tgz",
@@ -1671,35 +616,12 @@
         "has-flag": "^3.0.0"
       }
     },
-    "test-exclude": {
-      "version": "6.0.0",
-      "resolved": "https://registry.npmjs.org/test-exclude/-/test-exclude-6.0.0.tgz",
-      "integrity": "sha512-cAGWPIyOHU6zlmg88jwm7VRyXnMN7iV68OGAbYDk/Mh/xC/pzVPlQtY6ngoIH/5/tciuhGfvESU8GrHrcxD56w==",
-      "dev": true,
-      "requires": {
-        "@istanbuljs/schema": "^0.1.2",
-        "glob": "^7.1.4",
-        "minimatch": "^3.0.4"
-      }
-    },
-    "to-fast-properties": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/to-fast-properties/-/to-fast-properties-2.0.0.tgz",
-      "integrity": "sha1-3F5pjL0HkmW8c+A3doGk5Og/YW4=",
-      "dev": true
-    },
     "type-detect": {
       "version": "4.0.8",
       "resolved": "https://registry.npmjs.org/type-detect/-/type-detect-4.0.8.tgz",
       "integrity": "sha512-0fr/mIH1dlO+x7TlcMy+bIDqKPsw/70tVyeHW787goQjhmqaZe10uwLujubK9q9Lg6Fiho1KUKDYz0Z7k7g5/g==",
       "dev": true
     },
-    "type-fest": {
-      "version": "0.8.1",
-      "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.8.1.tgz",
-      "integrity": "sha512-4dbzIzqvjtgiM5rw1k5rEHtBANKmdudhGyBEajN01fEyhaAIhsoKNy6y7+IN93IfpFtwY9iqi7kD+xwKhQsNJA==",
-      "dev": true
-    },
     "type-is": {
       "version": "1.6.18",
       "resolved": "https://registry.npmjs.org/type-is/-/type-is-1.6.18.tgz",
@@ -1709,125 +631,11 @@
         "mime-types": "~2.1.24"
       }
     },
-    "typedarray-to-buffer": {
-      "version": "3.1.5",
-      "resolved": "https://registry.npmjs.org/typedarray-to-buffer/-/typedarray-to-buffer-3.1.5.tgz",
-      "integrity": "sha512-zdu8XMNEDepKKR+XYOXAVPtWui0ly0NtohUscw+UmaHiAWT8hrV1rr//H6V+0DvJ3OQ19S979M0laLfX8rm82Q==",
-      "dev": true,
-      "requires": {
-        "is-typedarray": "^1.0.0"
-      }
-    },
-    "uuid": {
-      "version": "3.4.0",
-      "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.4.0.tgz",
-      "integrity": "sha512-HjSDRw6gZE5JMggctHBcjVak08+KEVhSIiDzFnT9S9aegmp85S/bReBVTb4QTFaRNptJ9kuYaNhnbNEOkbKb/A==",
-      "dev": true
-    },
-    "which": {
-      "version": "2.0.2",
-      "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
-      "integrity": "sha512-BLI3Tl1TW3Pvl70l3yq3Y64i+awpwXqsGBYWkkqMtnbXgrMD+yj7rhW0kuEDxzJaYXGjEW5ogapKNMEKNMjibA==",
-      "dev": true,
-      "requires": {
-        "isexe": "^2.0.0"
-      }
-    },
-    "which-module": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/which-module/-/which-module-2.0.0.tgz",
-      "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho=",
-      "dev": true
-    },
-    "wrap-ansi": {
-      "version": "6.2.0",
-      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-6.2.0.tgz",
-      "integrity": "sha512-r6lPcBGxZXlIcymEu7InxDMhdW0KDxpLgoFLcguasxCaJ/SOIZwINatK9KY/tf+ZrlywOKU0UDj3ATXUBfxJXA==",
-      "dev": true,
-      "requires": {
-        "ansi-styles": "^4.0.0",
-        "string-width": "^4.1.0",
-        "strip-ansi": "^6.0.0"
-      },
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-        "ansi-styles": {
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-          "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-4.3.0.tgz",
-          "integrity": "sha512-zbB9rCJAT1rbjiVDb2hqKFHNYLxgtk8NURxZ3IZwD3F6NtxbXZQCnnSi1Lkx+IDohdPlFp222wVALIheZJQSEg==",
-          "dev": true,
-          "requires": {
-            "color-convert": "^2.0.1"
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-        "color-convert": {
-          "version": "2.0.1",
-          "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-2.0.1.tgz",
-          "integrity": "sha512-RRECPsj7iu/xb5oKYcsFHSppFNnsj/52OVTRKb4zP5onXwVF3zVmmToNcOfGC+CRDpfK/U584fMg38ZHCaElKQ==",
-          "dev": true,
-          "requires": {
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-        "color-name": {
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-          "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.4.tgz",
-          "integrity": "sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA==",
-          "dev": true
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       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
       "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
       "dev": true
-    },
-    "write-file-atomic": {
-      "version": "3.0.3",
-      "resolved": "https://registry.npmjs.org/write-file-atomic/-/write-file-atomic-3.0.3.tgz",
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-      "dev": true,
-      "requires": {
-        "imurmurhash": "^0.1.4",
-        "is-typedarray": "^1.0.0",
-        "signal-exit": "^3.0.2",
-        "typedarray-to-buffer": "^3.1.5"
-      }
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-      "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.3.tgz",
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-      "dev": true
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-    "yargs": {
-      "version": "15.4.1",
-      "resolved": "https://registry.npmjs.org/yargs/-/yargs-15.4.1.tgz",
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-      "dev": true,
-      "requires": {
-        "cliui": "^6.0.0",
-        "decamelize": "^1.2.0",
-        "find-up": "^4.1.0",
-        "get-caller-file": "^2.0.1",
-        "require-directory": "^2.1.1",
-        "require-main-filename": "^2.0.0",
-        "set-blocking": "^2.0.0",
-        "string-width": "^4.2.0",
-        "which-module": "^2.0.0",
-        "y18n": "^4.0.0",
-        "yargs-parser": "^18.1.2"
-      }
-    },
-    "yargs-parser": {
-      "version": "18.1.3",
-      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-18.1.3.tgz",
-      "integrity": "sha512-o50j0JeToy/4K6OZcaQmW6lyXXKhq7csREXcDwk2omFPJEwUNOVtJKvmDr9EI1fAJZUyZcRF7kxGBWmRXudrCQ==",
-      "dev": true,
-      "requires": {
-        "camelcase": "^5.0.0",
-        "decamelize": "^1.2.0"
-      }
     }
   }
 }
diff --git a/package.json b/package.json
index daaa09c..71d3393 100644
--- a/package.json
+++ b/package.json
@@ -26,10 +26,9 @@
     "type-is": "1.6.18"
   },
   "devDependencies": {
+    "chai": "^4.3.4",
     "jshint": "2.13.0",
     "mocha": "5.2.0",
-    "nyc": "^15.1.0",
-    "should": "13.2.3",
     "sinon": "7.5.0"
   },
   "license": "MIT",
diff --git a/test/assertions.js b/test/assertions.js
index 6846e3c..8e10785 100644
--- a/test/assertions.js
+++ b/test/assertions.js
@@ -4,14 +4,16 @@
  * Module dependencies.
  */
 
-var should = require('should');
+var chai = require('chai');
 
 /**
  * SHA-1 assertion.
  */
+chai.use(function (_chai, utils) {
 
-should.Assertion.add('sha1', function() {
-  this.params = { operator: 'to be a valid SHA-1 hash' };
-
-  this.obj.should.match(/^[a-f0-9]{40}$/i);
-}, true);
+  utils.addMethod(chai.Assertion.prototype, 'sha1', function () {
+    var obj = utils.flag(this, 'object');
+    new chai.Assertion(obj).match(/^[a-f0-9]{40}$/i);
+  });
+  
+});
diff --git a/test/integration/grant-types/abstract-grant-type_test.js b/test/integration/grant-types/abstract-grant-type_test.js
index 6da489c..f292af8 100644
--- a/test/integration/grant-types/abstract-grant-type_test.js
+++ b/test/integration/grant-types/abstract-grant-type_test.js
@@ -8,7 +8,7 @@ var AbstractGrantType = require('../../../lib/grant-types/abstract-grant-type');
 var InvalidArgumentError = require('../../../lib/errors/invalid-argument-error');
 var Promise = require('bluebird');
 var Request = require('../../../lib/request');
-var should = require('should');
+var should = require('chai').should();
 
 /**
  * Test `AbstractGrantType` integration.
diff --git a/test/integration/grant-types/authorization-code-grant-type_test.js b/test/integration/grant-types/authorization-code-grant-type_test.js
index 7f84e34..417a23a 100644
--- a/test/integration/grant-types/authorization-code-grant-type_test.js
+++ b/test/integration/grant-types/authorization-code-grant-type_test.js
@@ -11,7 +11,7 @@ var InvalidRequestError = require('../../../lib/errors/invalid-request-error');
 var Promise = require('bluebird');
 var Request = require('../../../lib/request');
 var ServerError = require('../../../lib/errors/server-error');
-var should = require('should');
+var should = require('chai').should();
 
 /**
  * Test `AuthorizationCodeGrantType` integration.
diff --git a/test/integration/grant-types/client-credentials-grant-type_test.js b/test/integration/grant-types/client-credentials-grant-type_test.js
index 15ec9cc..3bddec8 100644
--- a/test/integration/grant-types/client-credentials-grant-type_test.js
+++ b/test/integration/grant-types/client-credentials-grant-type_test.js
@@ -9,7 +9,7 @@ var InvalidArgumentError = require('../../../lib/errors/invalid-argument-error')
 var InvalidGrantError = require('../../../lib/errors/invalid-grant-error');
 var Promise = require('bluebird');
 var Request = require('../../../lib/request');
-var should = require('should');
+var should = require('chai').should();
 
 /**
  * Test `ClientCredentialsGrantType` integration.
diff --git a/test/integration/grant-types/password-grant-type_test.js b/test/integration/grant-types/password-grant-type_test.js
index 9cdf50d..916355d 100644
--- a/test/integration/grant-types/password-grant-type_test.js
+++ b/test/integration/grant-types/password-grant-type_test.js
@@ -10,7 +10,7 @@ var InvalidRequestError = require('../../../lib/errors/invalid-request-error');
 var PasswordGrantType = require('../../../lib/grant-types/password-grant-type');
 var Promise = require('bluebird');
 var Request = require('../../../lib/request');
-var should = require('should');
+var should = require('chai').should();
 
 /**
  * Test `PasswordGrantType` integration.
diff --git a/test/integration/grant-types/refresh-token-grant-type_test.js b/test/integration/grant-types/refresh-token-grant-type_test.js
index 925396a..cbc2947 100644
--- a/test/integration/grant-types/refresh-token-grant-type_test.js
+++ b/test/integration/grant-types/refresh-token-grant-type_test.js
@@ -11,7 +11,7 @@ var Promise = require('bluebird');
 var RefreshTokenGrantType = require('../../../lib/grant-types/refresh-token-grant-type');
 var Request = require('../../../lib/request');
 var ServerError = require('../../../lib/errors/server-error');
-var should = require('should');
+var should = require('chai').should();
 
 /**
  * Test `RefreshTokenGrantType` integration.
diff --git a/test/integration/handlers/authenticate-handler_test.js b/test/integration/handlers/authenticate-handler_test.js
index 7852ea2..1e98a62 100644
--- a/test/integration/handlers/authenticate-handler_test.js
+++ b/test/integration/handlers/authenticate-handler_test.js
@@ -15,7 +15,7 @@ var Request = require('../../../lib/request');
 var Response = require('../../../lib/response');
 var ServerError = require('../../../lib/errors/server-error');
 var UnauthorizedRequestError = require('../../../lib/errors/unauthorized-request-error');
-var should = require('should');
+var should = require('chai').should();
 
 /**
  * Test `AuthenticateHandler` integration.
diff --git a/test/integration/handlers/authorize-handler_test.js b/test/integration/handlers/authorize-handler_test.js
index f895f82..ae0e41e 100644
--- a/test/integration/handlers/authorize-handler_test.js
+++ b/test/integration/handlers/authorize-handler_test.js
@@ -18,7 +18,7 @@ var Request = require('../../../lib/request');
 var Response = require('../../../lib/response');
 var ServerError = require('../../../lib/errors/server-error');
 var UnauthorizedClientError = require('../../../lib/errors/unauthorized-client-error');
-var should = require('should');
+var should = require('chai').should();
 var url = require('url');
 
 /**
diff --git a/test/integration/handlers/token-handler_test.js b/test/integration/handlers/token-handler_test.js
index 50277c1..26c2186 100644
--- a/test/integration/handlers/token-handler_test.js
+++ b/test/integration/handlers/token-handler_test.js
@@ -18,7 +18,7 @@ var ServerError = require('../../../lib/errors/server-error');
 var TokenHandler = require('../../../lib/handlers/token-handler');
 var UnauthorizedClientError = require('../../../lib/errors/unauthorized-client-error');
 var UnsupportedGrantTypeError = require('../../../lib/errors/unsupported-grant-type-error');
-var should = require('should');
+var should = require('chai').should();
 var util = require('util');
 
 /**
@@ -121,8 +121,8 @@ describe('TokenHandler integration', function() {
         saveToken: function() {}
       };
       var handler = new TokenHandler({ accessTokenLifetime: 120, extendedGrantTypes: extendedGrantTypes, model: model, refreshTokenLifetime: 120 });
-
-      handler.grantTypes.should.containEql(extendedGrantTypes);
+	  console.log(handler.grantTypes);
+      handler.grantTypes.should.deep.include(extendedGrantTypes);
     });
 
     it('should set the `model`', function() {
@@ -997,8 +997,8 @@ describe('TokenHandler integration', function() {
       };
       var handler = new TokenHandler({ accessTokenLifetime: 120, model: model, refreshTokenLifetime: 120 });
       var tokenType = handler.getTokenType({ accessToken: 'foo', refreshToken: 'bar', scope: 'foobar' });
-
-      tokenType.should.containEql({ accessToken: 'foo', accessTokenLifetime: undefined, refreshToken: 'bar', scope: 'foobar' });
+	  console.log(tokenType);
+      tokenType.should.deep.include({ accessToken: 'foo', accessTokenLifetime: undefined, refreshToken: 'bar', scope: 'foobar' });
     });
   });
 
diff --git a/test/integration/request_test.js b/test/integration/request_test.js
index a435276..a62309d 100644
--- a/test/integration/request_test.js
+++ b/test/integration/request_test.js
@@ -6,7 +6,7 @@
 
 var Request = require('../../lib/request');
 var InvalidArgumentError = require('../../lib/errors/invalid-argument-error');
-var should = require('should');
+var should = require('chai').should();
 
 /**
  * Test `Request` integration.
diff --git a/test/integration/response-types/code-response-type_test.js b/test/integration/response-types/code-response-type_test.js
index 5461b62..e03b4a2 100644
--- a/test/integration/response-types/code-response-type_test.js
+++ b/test/integration/response-types/code-response-type_test.js
@@ -6,7 +6,7 @@
 
 var CodeResponseType = require('../../../lib/response-types/code-response-type');
 var InvalidArgumentError = require('../../../lib/errors/invalid-argument-error');
-var should = require('should');
+var should = require('chai').should();
 var url = require('url');
 
 /**
diff --git a/test/integration/server_test.js b/test/integration/server_test.js
index 2d3aa78..8baaae0 100644
--- a/test/integration/server_test.js
+++ b/test/integration/server_test.js
@@ -9,7 +9,7 @@ var Promise = require('bluebird');
 var Request = require('../../lib/request');
 var Response = require('../../lib/response');
 var Server = require('../../lib/server');
-var should = require('should');
+var should = require('chai').should();
 
 /**
  * Test `Server` integration.
diff --git a/test/integration/token-types/bearer-token-type_test.js b/test/integration/token-types/bearer-token-type_test.js
index 3c1ef6b..c8ad306 100644
--- a/test/integration/token-types/bearer-token-type_test.js
+++ b/test/integration/token-types/bearer-token-type_test.js
@@ -6,7 +6,7 @@
 
 var BearerTokenType = require('../../../lib/token-types/bearer-token-type');
 var InvalidArgumentError = require('../../../lib/errors/invalid-argument-error');
-var should = require('should');
+var should = require('chai').should();
 
 /**
  * Test `BearerTokenType` integration.
diff --git a/test/integration/utils/token-util_test.js b/test/integration/utils/token-util_test.js
index 3fbca3f..e0608e2 100644
--- a/test/integration/utils/token-util_test.js
+++ b/test/integration/utils/token-util_test.js
@@ -5,7 +5,7 @@
  */
 
 var TokenUtil = require('../../../lib/utils/token-util');
-var should = require('should');
+var should = require('chai').should();
 
 /**
  * Test `TokenUtil` integration.
diff --git a/test/mocha.opts b/test/mocha.opts
index 00ecb38..c594d38 100644
--- a/test/mocha.opts
+++ b/test/mocha.opts
@@ -1,4 +1,4 @@
---require should
+--require chai
 --require test/assertions
 --ui bdd
 --reporter spec
diff --git a/test/unit/grant-types/abstract-grant-type_test.js b/test/unit/grant-types/abstract-grant-type_test.js
index 528ca40..d2ccf72 100644
--- a/test/unit/grant-types/abstract-grant-type_test.js
+++ b/test/unit/grant-types/abstract-grant-type_test.js
@@ -6,7 +6,7 @@
 
 var AbstractGrantType = require('../../../lib/grant-types/abstract-grant-type');
 var sinon = require('sinon');
-var should = require('should');
+var should = require('chai').should();
 
 /**
  * Test `AbstractGrantType`.
diff --git a/test/unit/grant-types/authorization-code-grant-type_test.js b/test/unit/grant-types/authorization-code-grant-type_test.js
index 480416e..a9220cb 100644
--- a/test/unit/grant-types/authorization-code-grant-type_test.js
+++ b/test/unit/grant-types/authorization-code-grant-type_test.js
@@ -8,7 +8,7 @@ var AuthorizationCodeGrantType = require('../../../lib/grant-types/authorization
 var Promise = require('bluebird');
 var Request = require('../../../lib/request');
 var sinon = require('sinon');
-var should = require('should');
+var should = require('chai').should();
 
 /**
  * Test `AuthorizationCodeGrantType`.
diff --git a/test/unit/grant-types/client-credentials-grant-type_test.js b/test/unit/grant-types/client-credentials-grant-type_test.js
index fe1fc48..4b1c8b6 100644
--- a/test/unit/grant-types/client-credentials-grant-type_test.js
+++ b/test/unit/grant-types/client-credentials-grant-type_test.js
@@ -6,7 +6,7 @@
 
 var ClientCredentialsGrantType = require('../../../lib/grant-types/client-credentials-grant-type');
 var sinon = require('sinon');
-var should = require('should');
+var should = require('chai').should();
 
 /**
  * Test `ClientCredentialsGrantType`.
diff --git a/test/unit/grant-types/password-grant-type_test.js b/test/unit/grant-types/password-grant-type_test.js
index 8e3bfc8..c99c2ef 100644
--- a/test/unit/grant-types/password-grant-type_test.js
+++ b/test/unit/grant-types/password-grant-type_test.js
@@ -7,7 +7,7 @@
 var PasswordGrantType = require('../../../lib/grant-types/password-grant-type');
 var Request = require('../../../lib/request');
 var sinon = require('sinon');
-var should = require('should');
+var should = require('chai').should();
 
 /**
  * Test `PasswordGrantType`.
diff --git a/test/unit/grant-types/refresh-token-grant-type_test.js b/test/unit/grant-types/refresh-token-grant-type_test.js
index e5693ba..5775f43 100644
--- a/test/unit/grant-types/refresh-token-grant-type_test.js
+++ b/test/unit/grant-types/refresh-token-grant-type_test.js
@@ -7,7 +7,7 @@
 var RefreshTokenGrantType = require('../../../lib/grant-types/refresh-token-grant-type');
 var Request = require('../../../lib/request');
 var sinon = require('sinon');
-var should = require('should');
+var should = require('chai').should();
 
 /**
  * Test `RefreshTokenGrantType`.
diff --git a/test/unit/handlers/authenticate-handler_test.js b/test/unit/handlers/authenticate-handler_test.js
index 2adac78..c280002 100644
--- a/test/unit/handlers/authenticate-handler_test.js
+++ b/test/unit/handlers/authenticate-handler_test.js
@@ -7,7 +7,7 @@
 var AuthenticateHandler = require('../../../lib/handlers/authenticate-handler');
 var Request = require('../../../lib/request');
 var sinon = require('sinon');
-var should = require('should');
+var should = require('chai').should();
 var ServerError = require('../../../lib/errors/server-error');
 
 /**
diff --git a/test/unit/handlers/authorize-handler_test.js b/test/unit/handlers/authorize-handler_test.js
index fe9b6b1..35ece25 100644
--- a/test/unit/handlers/authorize-handler_test.js
+++ b/test/unit/handlers/authorize-handler_test.js
@@ -9,7 +9,7 @@ var Request = require('../../../lib/request');
 var Response = require('../../../lib/response');
 var Promise = require('bluebird');
 var sinon = require('sinon');
-var should = require('should');
+var should = require('chai').should();
 
 /**
  * Test `AuthorizeHandler`.
diff --git a/test/unit/handlers/token-handler_test.js b/test/unit/handlers/token-handler_test.js
index 2b37cd0..4dd2199 100644
--- a/test/unit/handlers/token-handler_test.js
+++ b/test/unit/handlers/token-handler_test.js
@@ -7,7 +7,7 @@
 var Request = require('../../../lib/request');
 var TokenHandler = require('../../../lib/handlers/token-handler');
 var sinon = require('sinon');
-var should = require('should');
+var should = require('chai').should();
 
 /**
  * Test `TokenHandler`.
diff --git a/test/unit/models/token-model_test.js b/test/unit/models/token-model_test.js
index 3d89995..b4664fc 100644
--- a/test/unit/models/token-model_test.js
+++ b/test/unit/models/token-model_test.js
@@ -1,5 +1,5 @@
 var TokenModel = require('../../../lib/models/token-model');
-
+var should = require('chai').should();
 /**
  * Test `Server`.
  */
@@ -18,7 +18,8 @@ describe('Model', function() {
       };
   
       var model = new TokenModel(data);
-      model.accessTokenLifetime.should.be.Number;
+	  should.exist(model.accessTokenLifetime);
+      model.accessTokenLifetime.should.a('number');
       model.accessTokenLifetime.should.be.approximately(3600, 2);
     });
   });
diff --git a/test/unit/request_test.js b/test/unit/request_test.js
index 458cb8f..a86005a 100644
--- a/test/unit/request_test.js
+++ b/test/unit/request_test.js
@@ -5,7 +5,7 @@
  */
 
 var Request = require('../../lib/request');
-var should = require('should');
+var should = require('chai').should();
 
 /**
  * Test `Request`.
diff --git a/test/unit/response_test.js b/test/unit/response_test.js
index c435e32..9d6b8a6 100644
--- a/test/unit/response_test.js
+++ b/test/unit/response_test.js
@@ -5,7 +5,7 @@
  */
 
 var Response = require('../../lib/response');
-var should = require('should');
+var should = require('chai').should();
 
 /**
  * Test `Request`.