diff --git a/moon.mod.json b/moon.mod.json
index 1c5fd59..2c31fa6 100644
--- a/moon.mod.json
+++ b/moon.mod.json
@@ -2,7 +2,7 @@
   "name": "moonbitlang/minimbt",
   "version": "0.1.0",
   "deps": {
-    "moonbitlang/x": "0.4.13",
+    "moonbitlang/x": "0.4.15",
     "Yoorkin/ArgParser": "0.1.6"
   },
   "readme": "README.md",