diff --git a/demo/tsconfig.json b/demo/tsconfig.json
index fe43de5d..ecbc336c 100644
--- a/demo/tsconfig.json
+++ b/demo/tsconfig.json
@@ -1,7 +1,7 @@
 {
   "extends": "@diplodoc/tsconfig",
   "compilerOptions": {
-    "lib": ["DOM", "ES6"],
+    "lib": ["DOM", "ES2017"],
     "module": "esNext",
     "moduleResolution": "nodenext",
     "allowJs": false,
diff --git a/tsconfig.json b/tsconfig.json
index 3cfb3da5..d553d378 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,7 +1,7 @@
 {
   "extends": "@diplodoc/tsconfig/tsconfig",
   "compilerOptions": {
-    "lib": ["DOM", "ES6"],
+    "lib": ["DOM", "ES2017"],
     "module": "ESNext",
     "allowJs": false,
     "importHelpers": true,