diff --git a/biome.json b/biome.json
index 1a1cb10..0029fce 100644
--- a/biome.json
+++ b/biome.json
@@ -3,8 +3,17 @@
   "vcs": { "enabled": true, "clientKind": "git", "useIgnoreFile": true },
   "files": { "includes": ["src/**/*", "*.js", "*.json"] },
   "formatter": { "enabled": true, "indentStyle": "space", "indentWidth": 2, "lineWidth": 120 },
-  "linter": { "enabled": true, "rules": { "preset": "recommended" } },
+  "linter": {
+    "enabled": true,
+    "rules": {
+      "recommended": true,
+      "correctness": {
+        "noUndeclaredVariables": "error"
+      }
+    }
+  },
   "javascript": {
+    "globals": ["describe", "it", "expect"],
     "formatter": {
       "quoteStyle": "single",
       "semicolons": "always",