diff --git a/package-lock.json b/package-lock.json
index d91b0a6..4b401c9 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1070,11 +1070,12 @@
 			"dev": true
 		},
 		"backstopjs": {
-			"version": "4.1.9",
-			"resolved": "https://registry.npmjs.org/backstopjs/-/backstopjs-4.1.9.tgz",
-			"integrity": "sha512-gTo2OSO5NIB57dOpqVXZ8BVr3iW1ZQVTPl6Gl9f0k5+QCQxS2Gh9U82UKMn1Y9KxnjJJN1a1iCYoEcda/YXbVg==",
+			"version": "3.8.9",
+			"resolved": "https://registry.npmjs.org/backstopjs/-/backstopjs-3.8.9.tgz",
+			"integrity": "sha512-b/1qucdURRYYk7+w54l4Ge/CuVk8EG8VWRy+loO/Kl8RjhWdltZxk5d8Mh5sfHPoNr4ICYB05RtgH25ESwGtOQ==",
 			"dev": true,
 			"requires": {
+				"casperjs": "^1.1.0-beta5",
 				"chalk": "^1.1.3",
 				"chromy": "0.5.11",
 				"diverged": "^0.1.3",
@@ -1089,10 +1090,10 @@
 				"os": "^0.1.1",
 				"p-map": "^1.1.1",
 				"path": "^0.12.7",
+				"phantomjs-prebuilt": "^2.1.16",
 				"portfinder": "^1.0.17",
-				"puppeteer": "^1.15.0",
-				"resolve": "^1.11.1",
-				"super-simple-web-server": "^1.1.2",
+				"puppeteer": "^1.2.0-next.1523485686787",
+				"super-simple-web-server": "^1.1.0",
 				"temp": "^0.8.3"
 			},
 			"dependencies": {
@@ -2589,6 +2590,12 @@
 			"integrity": "sha1-G2gcIf+EAzyCZUMJBolCDRhxUdw=",
 			"dev": true
 		},
+		"casperjs": {
+			"version": "1.1.4",
+			"resolved": "https://registry.npmjs.org/casperjs/-/casperjs-1.1.4.tgz",
+			"integrity": "sha1-6wH07YWsUgqPTZMrTap00+d7x0Y=",
+			"dev": true
+		},
 		"chalk": {
 			"version": "2.4.2",
 			"resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.2.tgz",
@@ -6643,6 +6650,12 @@
 				}
 			}
 		},
+		"kew": {
+			"version": "0.7.0",
+			"resolved": "https://registry.npmjs.org/kew/-/kew-0.7.0.tgz",
+			"integrity": "sha1-edk9LTM2PW/dKXCzNdkUGtWR15s=",
+			"dev": true
+		},
 		"keyv": {
 			"version": "3.1.0",
 			"resolved": "https://registry.npmjs.org/keyv/-/keyv-3.1.0.tgz",
@@ -6953,9 +6966,9 @@
 			}
 		},
 		"lodash": {
-			"version": "4.17.11",
-			"resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.11.tgz",
-			"integrity": "sha512-cQKh8igo5QUhZ7lg38DYWAxMvjSAKG0A8wGSVimP07SIUEK2UO+arSRKbRZWtelMtN5V0Hkwh5ryOto/SshYIg==",
+			"version": "4.17.14",
+			"resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.14.tgz",
+			"integrity": "sha512-mmKYbW3GLuJeX+iGP+Y7Gp1AiGHGbXHCOh/jZmrawMmsE7MS4znI3RL2FsjbqOyMayHInjOeykW7PEajUk1/xw==",
 			"dev": true
 		},
 		"lodash.capitalize": {
@@ -6995,9 +7008,9 @@
 			"dev": true
 		},
 		"lodash.merge": {
-			"version": "4.6.1",
-			"resolved": "https://registry.npmjs.org/lodash.merge/-/lodash.merge-4.6.1.tgz",
-			"integrity": "sha512-AOYza4+Hf5z1/0Hztxpm2/xiPZgi/cjMqdnKTUWTBSKchJlxXXuUSxCCl8rJlf4g6yww/j6mA8nC8Hw/EZWxKQ==",
+			"version": "4.6.2",
+			"resolved": "https://registry.npmjs.org/lodash.merge/-/lodash.merge-4.6.2.tgz",
+			"integrity": "sha512-0KpjqXRVvrYyCsX1swR/XTK0va6VQkQM6MNo7PqW77ByjAhoARA8EfrP1N4+KlKj8YS0ZUCtRT/YUuhyYDujIQ==",
 			"dev": true
 		},
 		"log-symbols": {
@@ -8673,6 +8686,58 @@
 			"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"
+			},
+			"dependencies": {
+				"es6-promise": {
+					"version": "4.2.8",
+					"resolved": "https://registry.npmjs.org/es6-promise/-/es6-promise-4.2.8.tgz",
+					"integrity": "sha512-HJDGx5daxeIvxdBxvG2cb9g4tEvwIk3i8+nhX0yGrYmZUzbkdg8QbDevheDB8gd0//uPj4c1EQua8Q+MViT0/w==",
+					"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"
+					}
+				},
+				"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"
+					}
+				},
+				"progress": {
+					"version": "1.1.8",
+					"resolved": "https://registry.npmjs.org/progress/-/progress-1.1.8.tgz",
+					"integrity": "sha1-4mDHj2Fhzdmw5WzD4Khd4Xx6V74=",
+					"dev": true
+				}
+			}
+		},
 		"phin": {
 			"version": "2.9.3",
 			"resolved": "https://registry.npmjs.org/phin/-/phin-2.9.3.tgz",
@@ -8826,9 +8891,9 @@
 			"dev": true
 		},
 		"portfinder": {
-			"version": "1.0.20",
-			"resolved": "https://registry.npmjs.org/portfinder/-/portfinder-1.0.20.tgz",
-			"integrity": "sha512-Yxe4mTyDzTd59PZJY4ojZR8F+E5e97iq2ZOHPz3HDgSvYC5siNad2tLooQ5y5QHyQhc3xVqvyk/eNA3wuoa7Sw==",
+			"version": "1.0.21",
+			"resolved": "https://registry.npmjs.org/portfinder/-/portfinder-1.0.21.tgz",
+			"integrity": "sha512-ESabpDCzmBS3ekHbmpAIiESq3udRsCBGiBZLsC+HgBKv2ezb0R4oG+7RnYEVZ/ZCfhel5Tx3UzdNWA0Lox2QCA==",
 			"dev": true,
 			"requires": {
 				"async": "^1.5.2",
@@ -10494,6 +10559,15 @@
 				"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"
+			}
+		},
 		"require-directory": {
 			"version": "2.1.1",
 			"resolved": "https://registry.npmjs.org/require-directory/-/require-directory-2.1.1.tgz",
@@ -12444,6 +12518,12 @@
 				}
 			}
 		},
+		"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": "https://registry.npmjs.org/through/-/through-2.3.8.tgz",
diff --git a/package.json b/package.json
index 1567553..ceabbd7 100644
--- a/package.json
+++ b/package.json
@@ -50,7 +50,7 @@
 	"devDependencies": {
 		"autoprefixer": "^9.6.1",
 		"ava": "^2.2.0",
-		"backstopjs": "^4.1.9",
+		"backstopjs": "^3.8.9",
 		"banner-cli": "^0.14.0",
 		"browser-sync": "^2.18.5",
 		"eslint": "^6.0.1",
@@ -76,7 +76,7 @@
 		"banner": "banner-cli dist/*.css",
 		"watch": "onchange src -- run-p build",
 		"serve": "browser-sync start --no-notify -s test --ss dist -f dist",
-		"backstop": "run-s build && run-p serve compare",
+		"backstop": "run-s build && run-s serve compare",
 		"reference": "backstop reference --configPath=backstop.conf.js",
 		"compare": "backstop test --configPath=backstop.conf.js",
 		"lint": "sass-lint -c .sasslintrc src --verbose --no-exit && eslint . --ignore-path .gitignore package.js",