diff --git a/acorn/dist/acorn.d.ts b/acorn/dist/acorn.d.ts
index bda5f803c..29e387703 100644
--- a/acorn/dist/acorn.d.ts
+++ b/acorn/dist/acorn.d.ts
@@ -12,7 +12,7 @@ declare namespace acorn {
   }
 
   interface Options {
-    ecmaVersion?: 3 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020
+    ecmaVersion?: 3 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 'latest'
     sourceType?: 'script' | 'module'
     onInsertedSemicolon?: (lastTokEnd: number, lastTokEndLoc?: Position) => void
     onTrailingComma?: (lastTokEnd: number, lastTokEndLoc?: Position) => void