diff --git a/ts/00_commitinfo_data.ts b/ts/00_commitinfo_data.ts
index e5e0355..76d8969 100644
--- a/ts/00_commitinfo_data.ts
+++ b/ts/00_commitinfo_data.ts
@@ -3,6 +3,6 @@
  */
 export const commitinfo = {
   name: '@git.zone/tsbuild',
-  version: '2.1.77',
+  version: '2.1.78',
   description: 'TypeScript nightly to easily make use of latest features'
 }
diff --git a/ts/tsbuild.classes.compiler.ts b/ts/tsbuild.classes.compiler.ts
index f83a800..a1c1b72 100644
--- a/ts/tsbuild.classes.compiler.ts
+++ b/ts/tsbuild.classes.compiler.ts
@@ -15,7 +15,7 @@ export const compilerOptionsDefault: CompilerOptions = {
   module: plugins.typescript.ModuleKind.NodeNext,
   target: plugins.typescript.ScriptTarget.ESNext,
   moduleResolution: plugins.typescript.ModuleResolutionKind.NodeNext,
-  lib: ['lib.dom.d.ts', 'es2022'],
+  lib: ['lib.dom.d.ts', 'es2021'],
   noImplicitAny: true,
   esModuleInterop: true,
   useDefineForClassFields: false,