diff --git a/src/internal/focus-lock-utils/utils.ts b/src/internal/focus-lock-utils/utils.ts
index d4c11eb..1debbda 100644
--- a/src/internal/focus-lock-utils/utils.ts
+++ b/src/internal/focus-lock-utils/utils.ts
@@ -30,7 +30,7 @@ export function isFocusable(element: HTMLElement): boolean {
 }
 
 export function getAllFocusables(container: HTMLElement): HTMLElement[] {
-  return Array.prototype.slice.call(container.querySelectorAll(tabbables));
+  return [...container.querySelectorAll(tabbables)] as HTMLElement[];
 }
 
 function getFocusables(container: HTMLElement): HTMLElement[] {
diff --git a/tsconfig.json b/tsconfig.json
index d536895..75b5f01 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,7 +1,7 @@
 {
   "compilerOptions": {
-    "lib": ["es2020", "dom"],
-    "target": "es2015",
+    "lib": ["es2021", "dom"],
+    "target": "es2021",
     "module": "esnext",
     "moduleResolution": "node",
     "esModuleInterop": true,