diff --git a/package-lock.json b/package-lock.json
index 088c41e..5f631cc 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -8802,4 +8802,4 @@
       }
     }
   }
-}
+}
\ No newline at end of file
diff --git a/src/tsconfig.json b/src/tsconfig.json
index 0c37200..18db89c 100644
--- a/src/tsconfig.json
+++ b/src/tsconfig.json
@@ -3,7 +3,8 @@
     "composite": true,
     "declaration": true,
     "outDir": "../lib",
-    "rootDir": "."
+    "rootDir": ".",
+    "target": "ES2015"
   },
   "extends": "../tsconfig.json",
   "include": [