diff --git a/package.json b/package.json
index 0315977..88104f1 100644
--- a/package.json
+++ b/package.json
@@ -44,7 +44,7 @@
 	],
 	"devDependencies": {
 		"@wessberg/di-compiler": "^2.0.2",
-		"@wessberg/rollup-plugin-ts": "1.1.28",
+		"@wessberg/rollup-plugin-ts": "1.1.34",
 		"@wessberg/scaffold": "^1.0.17",
 		"@wessberg/ts-config": "^0.0.39",
 		"husky": "^1.3.1",
@@ -53,24 +53,24 @@
 		"pretty-quick": "^1.10.0",
 		"standard-changelog": "^2.0.7",
 		"ts-node": "^8.0.2",
-		"tslint": "^5.12.1",
-		"typescript": "^3.3.3",
+		"tslint": "^5.13.1",
+		"typescript": "^3.3.3333",
 		"useragent-generator": "^1.1.0"
 	},
 	"dependencies": {
-		"@babel/core": "^7.3.3",
+		"@babel/core": "^7.3.4",
 		"@types/astring": "^1.3.0",
 		"@types/file-type": "^10.6.0",
 		"@types/iltorb": "^2.3.0",
 		"@types/memory-fs": "^0.3.2",
 		"@types/mime": "^2.0.1",
-		"@types/node": "^11.9.4",
+		"@types/node": "^11.9.6",
 		"@types/semver": "^5.5.0",
 		"@webcomponents/custom-elements": "^1.2.1",
 		"@webcomponents/shadycss": "^1.9.0",
 		"@webcomponents/shadydom": "^1.5.0",
 		"@webcomponents/template": "^1.4.0",
-		"@wessberg/browserslist-generator": "1.0.11",
+		"@wessberg/browserslist-generator": "1.0.12",
 		"@wessberg/di": "^2.0.3",
 		"@wessberg/fileloader": "^1.1.9",
 		"@wessberg/filesaver": "^1.0.8",
@@ -83,11 +83,11 @@
 		"chalk": "^2.4.2",
 		"console-polyfill": "^0.3.0",
 		"construct-style-sheets-polyfill": "^1.0.1",
-		"core-js": "^3.0.0-beta.15",
-		"core-js-builder": "^3.0.0-beta.15",
+		"core-js": "^3.0.0-beta.16",
+		"core-js-builder": "^3.0.0-beta.16",
 		"devcert": "^1.0.0",
 		"events-polyfill": "^2.1.0",
-		"file-type": "^10.7.1",
+		"file-type": "^10.8.0",
 		"http-status-codes": "^1.3.0",
 		"iltorb": "^2.4.1",
 		"intersection-observer": "^0.5.1",
@@ -107,11 +107,11 @@
 		"requestanimationframe": "0.0.23",
 		"requestidlecallback": "^0.3.0",
 		"resize-observer": "^1.0.0",
-		"rollup": "^1.1.2",
-		"rollup-plugin-commonjs": "^9.2.0",
+		"rollup": "^1.4.0",
+		"rollup-plugin-commonjs": "^9.2.1",
 		"rollup-plugin-multi-entry": "^2.1.0",
-		"rollup-plugin-node-resolve": "^4.0.0",
-		"scroll-behavior-polyfill": "^2.0.6",
+		"rollup-plugin-node-resolve": "^4.0.1",
+		"scroll-behavior-polyfill": "^2.0.7",
 		"semver": "^5.6.0",
 		"setimmediate": "^1.0.5",
 		"systemjs": "^3.0.0",
diff --git a/src/constant/constant.ts b/src/constant/constant.ts
index 078a496..0566e34 100644
--- a/src/constant/constant.ts
+++ b/src/constant/constant.ts
@@ -2770,7 +2770,7 @@ export const constant: IConstant = {
 			relativePaths: ["custom-elements.min.js"],
 			features: ["custom-elementsv1"],
 			version: environment.NPM_PACKAGE_DEPENDENCIES__WEBCOMPONENTS_CUSTOM_ELEMENTS,
-			dependencies: ["es"],
+			dependencies: ["es", "mutation-observer"],
 			contexts: WINDOW_CONTEXT
 		},
 		"shadow-dom": {
diff --git a/test/server/server.test.ts b/test/server/server.test.ts
index 7fecbaa..4cfddf3 100644
--- a/test/server/server.test.ts
+++ b/test/server/server.test.ts
@@ -7,7 +7,7 @@ import {sendRequest} from "../../src/util/request-util/request-util";
 import {constant} from "../../src/constant/constant";
 import {initializeTests} from "./setup";
 // @ts-ignore
-import {chrome, ie, safari} from "useragent-generator";
+import {chrome, ie} from "useragent-generator";
 import {ContentEncodingKind} from "../../src/encoding/content-encoding-kind";
 import {getPolyfillRequestFromUrl} from "../../src/util/polyfill/polyfill-util";
 import {URL} from "url";