diff --git a/Makefile b/Makefile
index 87fd49ba9..01d52b9ab 100644
--- a/Makefile
+++ b/Makefile
@@ -47,7 +47,7 @@ node_modules: package.json
 # Tests
 #
 
-test: test-node test-phantom
+test: test-node test-chrome
 
 test-node: node_modules
 	@printf "==> [Test :: Node.js]\n"
@@ -61,10 +61,10 @@ test-cov: node_modules
 		--require ./test/bootstrap \
 		$(TESTS) \
 
-test-phantom: clean-browser chai.js
-	@printf "==> [Test :: Karma (PhantomJS)]\n"
+test-chrome: clean-browser chai.js
+	@printf "==> [Test :: Karma (chrome)]\n"
 	@./node_modules/karma/bin/karma start \
-		--single-run --browsers PhantomJS
+		--single-run --browsers HeadlessChrome
 
 test-firefox: clean-browser chai.js
 	@printf "==> [Test :: Karma (Firefox)]\n"
@@ -101,6 +101,6 @@ clean-cov:
 #
 
 .PHONY: all
-.PHONY: test test-all test-node test-phantom test-sauce test-cov
+.PHONY: test test-all test-node test-chrome test-sauce test-cov
 .PHONY: clean clean-node clean-browser clean-cov
 .PHONY: release-patch release-minor release-major
diff --git a/karma.conf.js b/karma.conf.js
index 3dadb55c0..e22923fc5 100644
--- a/karma.conf.js
+++ b/karma.conf.js
@@ -10,7 +10,13 @@ module.exports = function(config) {
     , colors: true
     , logLevel: config.LOG_INFO
     , autoWatch: false
-    , browsers: [ 'PhantomJS' ]
+    , browsers: [ 'HeadlessChrome' ]
+    , customLaunchers: {
+      HeadlessChrome: {
+      base: 'ChromeHeadless'
+    , flags: [ '--no-sandbox',]
+    , }
+    , }
     , browserDisconnectTimeout: 10000
     , browserDisconnectTolerance: 2
     , browserNoActivityTimeout: 20000
diff --git a/package-lock.json b/package-lock.json
index 1cb0ccb11..4b1e43621 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "chai",
-  "version": "4.1.2",
+  "version": "4.2.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -1941,18 +1941,6 @@
         }
       }
     },
-    "extract-zip": {
-      "version": "1.6.7",
-      "resolved": "https://registry.npmjs.org/extract-zip/-/extract-zip-1.6.7.tgz",
-      "integrity": "sha1-qEC0uK9kAyZMjbV/Txp0Mz74H+k=",
-      "dev": true,
-      "requires": {
-        "concat-stream": "1.6.2",
-        "debug": "2.6.9",
-        "mkdirp": "0.5.1",
-        "yauzl": "2.4.1"
-      }
-    },
     "extsprintf": {
       "version": "1.3.0",
       "resolved": "https://registry.npmjs.org/extsprintf/-/extsprintf-1.3.0.tgz",
@@ -1977,15 +1965,6 @@
       "integrity": "sha1-PYpcZog6FqMMqGQ+hR8Zuqd5eRc=",
       "dev": true
     },
-    "fd-slicer": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/fd-slicer/-/fd-slicer-1.0.1.tgz",
-      "integrity": "sha1-i1vL2ewyfFBBv5qwI/1nUPEXfmU=",
-      "dev": true,
-      "requires": {
-        "pend": "~1.2.0"
-      }
-    },
     "file-uri-to-path": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/file-uri-to-path/-/file-uri-to-path-1.0.0.tgz",
@@ -2102,23 +2081,21 @@
         "map-cache": "^0.2.2"
       }
     },
+    "fs-access": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/fs-access/-/fs-access-1.0.1.tgz",
+      "integrity": "sha1-1qh/JiJxzv6+wwxVNAf7mV2od3o=",
+      "dev": true,
+      "requires": {
+        "null-check": "^1.0.0"
+      }
+    },
     "fs-constants": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/fs-constants/-/fs-constants-1.0.0.tgz",
       "integrity": "sha512-y6OAwoSIf7FyjMIv94u+b5rdheZEjzR63GTyZJm5qh4Bi+2YgwLCcI/fPFZkL5PSixOt6ZNKm+w+Hfp/Bciwow==",
       "dev": true
     },
-    "fs-extra": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/fs-extra/-/fs-extra-1.0.0.tgz",
-      "integrity": "sha1-zTzl9+fLYUWIP8rjGR6Yd/hYeVA=",
-      "dev": true,
-      "requires": {
-        "graceful-fs": "^4.1.2",
-        "jsonfile": "^2.1.0",
-        "klaw": "^1.0.0"
-      }
-    },
     "fs.realpath": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/fs.realpath/-/fs.realpath-1.0.0.tgz",
@@ -2166,12 +2143,14 @@
         "balanced-match": {
           "version": "1.0.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "brace-expansion": {
           "version": "1.1.11",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "balanced-match": "^1.0.0",
             "concat-map": "0.0.1"
@@ -2186,17 +2165,20 @@
         "code-point-at": {
           "version": "1.1.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "concat-map": {
           "version": "0.0.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "console-control-strings": {
           "version": "1.1.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "core-util-is": {
           "version": "1.0.2",
@@ -2313,7 +2295,8 @@
         "inherits": {
           "version": "2.0.3",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "ini": {
           "version": "1.3.5",
@@ -2325,6 +2308,7 @@
           "version": "1.0.0",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "number-is-nan": "^1.0.0"
           }
@@ -2339,6 +2323,7 @@
           "version": "3.0.4",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "brace-expansion": "^1.1.7"
           }
@@ -2346,12 +2331,14 @@
         "minimist": {
           "version": "0.0.8",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "minipass": {
           "version": "2.2.4",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "safe-buffer": "^5.1.1",
             "yallist": "^3.0.0"
@@ -2370,6 +2357,7 @@
           "version": "0.5.1",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "minimist": "0.0.8"
           }
@@ -2450,7 +2438,8 @@
         "number-is-nan": {
           "version": "1.0.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "object-assign": {
           "version": "4.1.1",
@@ -2462,6 +2451,7 @@
           "version": "1.4.0",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "wrappy": "1"
           }
@@ -2583,6 +2573,7 @@
           "version": "1.0.2",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "code-point-at": "^1.0.0",
             "is-fullwidth-code-point": "^1.0.0",
@@ -2953,16 +2944,6 @@
         "minimalistic-assert": "^1.0.1"
       }
     },
-    "hasha": {
-      "version": "2.2.0",
-      "resolved": "https://registry.npmjs.org/hasha/-/hasha-2.2.0.tgz",
-      "integrity": "sha1-eNfL/B5tZjA/55g3NlmEUXsvbuE=",
-      "dev": true,
-      "requires": {
-        "is-stream": "^1.0.1",
-        "pinkie-promise": "^2.0.0"
-      }
-    },
     "hawk": {
       "version": "3.1.3",
       "resolved": "https://registry.npmjs.org/hawk/-/hawk-3.1.3.tgz",
@@ -3361,7 +3342,8 @@
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/is-stream/-/is-stream-1.1.0.tgz",
       "integrity": "sha1-EtSj3U5o4Lec6428hBc66A2RykQ=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "is-typedarray": {
       "version": "1.0.0",
@@ -3501,15 +3483,6 @@
       "integrity": "sha1-Epai1Y/UXxmg9s4B1lcB4sc1tus=",
       "dev": true
     },
-    "jsonfile": {
-      "version": "2.4.0",
-      "resolved": "http://registry.npmjs.org/jsonfile/-/jsonfile-2.4.0.tgz",
-      "integrity": "sha1-NzaitCi4e72gzIO1P6PWM6NcKug=",
-      "dev": true,
-      "requires": {
-        "graceful-fs": "^4.1.6"
-      }
-    },
     "jsonify": {
       "version": "0.0.0",
       "resolved": "https://registry.npmjs.org/jsonify/-/jsonify-0.0.0.tgz",
@@ -3584,6 +3557,16 @@
         }
       }
     },
+    "karma-chrome-launcher": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/karma-chrome-launcher/-/karma-chrome-launcher-2.2.0.tgz",
+      "integrity": "sha512-uf/ZVpAabDBPvdPdveyk1EPgbnloPvFFGgmRhYLTDH7gEB4nZdSBk8yTU47w1g/drLSx5uMOkjKk7IWKfWg/+w==",
+      "dev": true,
+      "requires": {
+        "fs-access": "^1.0.0",
+        "which": "^1.2.1"
+      }
+    },
     "karma-firefox-launcher": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/karma-firefox-launcher/-/karma-firefox-launcher-1.1.0.tgz",
@@ -3599,16 +3582,6 @@
         "minimist": "1.2.0"
       }
     },
-    "karma-phantomjs-launcher": {
-      "version": "1.0.4",
-      "resolved": "https://registry.npmjs.org/karma-phantomjs-launcher/-/karma-phantomjs-launcher-1.0.4.tgz",
-      "integrity": "sha1-0jyjSAG9qYY60xjju0vUBisTrNI=",
-      "dev": true,
-      "requires": {
-        "lodash": "^4.0.1",
-        "phantomjs-prebuilt": "^2.1.7"
-      }
-    },
     "karma-sauce-launcher": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/karma-sauce-launcher/-/karma-sauce-launcher-1.2.0.tgz",
@@ -3621,27 +3594,12 @@
         "wd": "^1.4.0"
       }
     },
-    "kew": {
-      "version": "0.7.0",
-      "resolved": "https://registry.npmjs.org/kew/-/kew-0.7.0.tgz",
-      "integrity": "sha1-edk9LTM2PW/dKXCzNdkUGtWR15s=",
-      "dev": true
-    },
     "kind-of": {
       "version": "6.0.2",
       "resolved": "https://registry.npmjs.org/kind-of/-/kind-of-6.0.2.tgz",
       "integrity": "sha512-s5kLOcnH0XqDO+FvuaLX8DDjZ18CGFk7VygH40QoKPUQhW4e2rvM0rwUq0t8IQDOwYSeLK01U90OjzBTme2QqA==",
       "dev": true
     },
-    "klaw": {
-      "version": "1.3.1",
-      "resolved": "https://registry.npmjs.org/klaw/-/klaw-1.3.1.tgz",
-      "integrity": "sha1-QIhDO0azsbolnXh4XY6W9zugJDk=",
-      "dev": true,
-      "requires": {
-        "graceful-fs": "^4.1.9"
-      }
-    },
     "labeled-stream-splicer": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/labeled-stream-splicer/-/labeled-stream-splicer-2.0.1.tgz",
@@ -4366,6 +4324,12 @@
         "remove-trailing-separator": "^1.0.1"
       }
     },
+    "null-check": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/null-check/-/null-check-1.0.0.tgz",
+      "integrity": "sha1-l33/1xdgErnsMNKjnbXPcqBDnt0=",
+      "dev": true
+    },
     "oauth-sign": {
       "version": "0.9.0",
       "resolved": "https://registry.npmjs.org/oauth-sign/-/oauth-sign-0.9.0.tgz",
@@ -4670,46 +4634,25 @@
         "sha.js": "^2.4.8"
       }
     },
-    "pend": {
-      "version": "1.2.0",
-      "resolved": "https://registry.npmjs.org/pend/-/pend-1.2.0.tgz",
-      "integrity": "sha1-elfrVQpng/kRUzH89GY9XI4AelA=",
-      "dev": true
-    },
     "performance-now": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/performance-now/-/performance-now-2.1.0.tgz",
       "integrity": "sha1-Ywn04OX6kT7BxpMHrjZLSzd8nns=",
       "dev": true
     },
-    "phantomjs-prebuilt": {
-      "version": "2.1.16",
-      "resolved": "https://registry.npmjs.org/phantomjs-prebuilt/-/phantomjs-prebuilt-2.1.16.tgz",
-      "integrity": "sha1-79ISpKOWbTZHaE6ouniFSb4q7+8=",
-      "dev": true,
-      "requires": {
-        "es6-promise": "^4.0.3",
-        "extract-zip": "^1.6.5",
-        "fs-extra": "^1.0.0",
-        "hasha": "^2.2.0",
-        "kew": "^0.7.0",
-        "progress": "^1.1.8",
-        "request": "^2.81.0",
-        "request-progress": "^2.0.1",
-        "which": "^1.2.10"
-      }
-    },
     "pinkie": {
       "version": "2.0.4",
       "resolved": "https://registry.npmjs.org/pinkie/-/pinkie-2.0.4.tgz",
       "integrity": "sha1-clVrgM+g1IqXToDnckjoDtT3+HA=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "pinkie-promise": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/pinkie-promise/-/pinkie-promise-2.0.1.tgz",
       "integrity": "sha1-ITXW36ejWMBprJsXh3YogihFD/o=",
       "dev": true,
+      "optional": true,
       "requires": {
         "pinkie": "^2.0.0"
       }
@@ -4738,12 +4681,6 @@
       "integrity": "sha512-MtEC1TqN0EU5nephaJ4rAtThHtC86dNN9qCuEhtshvpVBkAW5ZO7BASN9REnF9eoXGcRub+pFuKEpOHE+HbEMw==",
       "dev": true
     },
-    "progress": {
-      "version": "1.1.8",
-      "resolved": "https://registry.npmjs.org/progress/-/progress-1.1.8.tgz",
-      "integrity": "sha1-4mDHj2Fhzdmw5WzD4Khd4Xx6V74=",
-      "dev": true
-    },
     "promisify-call": {
       "version": "2.0.4",
       "resolved": "https://registry.npmjs.org/promisify-call/-/promisify-call-2.0.4.tgz",
@@ -5013,15 +4950,6 @@
         "uuid": "^3.3.2"
       }
     },
-    "request-progress": {
-      "version": "2.0.1",
-      "resolved": "https://registry.npmjs.org/request-progress/-/request-progress-2.0.1.tgz",
-      "integrity": "sha1-XTa7V5YcZzqlt4jbyBQf3yO0Tgg=",
-      "dev": true,
-      "requires": {
-        "throttleit": "^1.0.0"
-      }
-    },
     "requestretry": {
       "version": "1.13.0",
       "resolved": "https://registry.npmjs.org/requestretry/-/requestretry-1.13.0.tgz",
@@ -5663,12 +5591,6 @@
         "xtend": "^4.0.0"
       }
     },
-    "throttleit": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/throttleit/-/throttleit-1.0.0.tgz",
-      "integrity": "sha1-nnhYNtr0Z0MUWlmEtiaNgoUorGw=",
-      "dev": true
-    },
     "through": {
       "version": "2.3.8",
       "resolved": "http://registry.npmjs.org/through/-/through-2.3.8.tgz",
@@ -6321,15 +6243,6 @@
       "dev": true,
       "optional": true
     },
-    "yauzl": {
-      "version": "2.4.1",
-      "resolved": "https://registry.npmjs.org/yauzl/-/yauzl-2.4.1.tgz",
-      "integrity": "sha1-lSj0QtqxsihOWLQ3m7GU4i4MQAU=",
-      "dev": true,
-      "requires": {
-        "fd-slicer": "~1.0.1"
-      }
-    },
     "yeast": {
       "version": "0.1.2",
       "resolved": "https://registry.npmjs.org/yeast/-/yeast-0.1.2.tgz",
diff --git a/package.json b/package.json
index 8bb33543d..54b2920cb 100644
--- a/package.json
+++ b/package.json
@@ -48,7 +48,7 @@
     "karma": "^2.0.0",
     "karma-firefox-launcher": "^1.0.0",
     "karma-mocha": "^1.0.1",
-    "karma-phantomjs-launcher": "^1.0.0",
+    "karma-chrome-launcher": "^2.2.0",
     "karma-sauce-launcher": "^1.2.0",
     "mocha": "^5.0.0"
   }