diff --git a/package-lock.json b/package-lock.json
index 0466cf5..7dcf615 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "@log4js2/core",
-  "version": "2.0.4",
+  "version": "2.0.6",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -2576,9 +2576,9 @@
       "dev": true
     },
     "core-js": {
-      "version": "2.5.7",
-      "resolved": "https://registry.npmjs.org/core-js/-/core-js-2.5.7.tgz",
-      "integrity": "sha512-RszJCAxg/PP6uzXVXL6BsxSXx/B05oJAQ2vkJRjyjrEcNVycaqOmNb5OTxZPE3xa5gwZduqza6L9JOCenh/Ecw==",
+      "version": "2.6.2",
+      "resolved": "https://registry.npmjs.org/core-js/-/core-js-2.6.2.tgz",
+      "integrity": "sha512-NdBPF/RVwPW6jr0NCILuyN9RiqLo2b1mddWHkUL+VnvcB7dzlnBJ1bXYntjpTGOgkZiiLWj2JxmOr7eGE3qK6g==",
       "dev": true
     },
     "core-util-is": {
@@ -6117,7 +6117,8 @@
     "lodash": {
       "version": "4.17.11",
       "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.11.tgz",
-      "integrity": "sha512-cQKh8igo5QUhZ7lg38DYWAxMvjSAKG0A8wGSVimP07SIUEK2UO+arSRKbRZWtelMtN5V0Hkwh5ryOto/SshYIg=="
+      "integrity": "sha512-cQKh8igo5QUhZ7lg38DYWAxMvjSAKG0A8wGSVimP07SIUEK2UO+arSRKbRZWtelMtN5V0Hkwh5ryOto/SshYIg==",
+      "dev": true
     },
     "lodash.debounce": {
       "version": "4.0.8",
diff --git a/package.json b/package.json
index 8120512..ccb409b 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@log4js2/core",
-  "version": "2.0.5",
+  "version": "2.0.6",
   "scripts": {
     "build": "tsc",
     "build:es5": "webpack --progress --colors --mode production",
@@ -56,7 +56,6 @@
     "webpack-cli": "^3.2.1"
   },
   "dependencies": {
-    "lodash": "^4.17.11",
     "reflect-metadata": "^0.1.12"
   },
   "jest": {
diff --git a/src/layout/formatter.ts b/src/layout/formatter.ts
index db76c6a..c7a920d 100644
--- a/src/layout/formatter.ts
+++ b/src/layout/formatter.ts
@@ -1,4 +1,3 @@
-import * as define from 'core-js/library/fn/object/define';
 import { LogLevel } from '../const/log.level';
 import { Method } from '../def';
 import { ILogEvent } from '../log.event';
diff --git a/types/global.d.ts b/types/global.d.ts
new file mode 100644
index 0000000..1f647a2
--- /dev/null
+++ b/types/global.d.ts
@@ -0,0 +1 @@
+declare var define: any;