diff --git a/packages/tests/tsconfig.dev.json b/packages/tests/tsconfig.dev.json
index 0e5599eb80..d64199f6ad 100644
--- a/packages/tests/tsconfig.dev.json
+++ b/packages/tests/tsconfig.dev.json
@@ -1,7 +1,7 @@
 {
   "extends": "./tsconfig",
   "compilerOptions": {
-    "module": "ESNext",
+    "module": "esnext",
     "noEmit": true
   },
   "include": ["src", "tests"]