diff --git a/package-lock.json b/package-lock.json
index 3ae43ea..ff50dfc 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -12,7 +12,7 @@
         "bs58": "6.0.0",
         "elliptic": "6.6.1",
         "lodash": "4.17.21",
-        "zod": "3.25.76"
+        "zod": "4.1.5"
       },
       "bin": {
         "bitpay-sdk": "bin/index.js"
@@ -9400,9 +9400,9 @@
       }
     },
     "node_modules/zod": {
-      "version": "3.25.76",
-      "resolved": "https://registry.npmjs.org/zod/-/zod-3.25.76.tgz",
-      "integrity": "sha512-gzUt/qt81nXsFGKIFcC3YnfEAx5NkunCfnDlvuBSSFS02bcXu4Lmea0AFIUwbLWxWPx3d9p8S5QoaujKcNQxcQ==",
+      "version": "4.1.5",
+      "resolved": "https://registry.npmjs.org/zod/-/zod-4.1.5.tgz",
+      "integrity": "sha512-rcUUZqlLJgBC33IT3PNMgsCq6TzLQEG/Ei/KTCU0PedSWRMAXoOUN+4t/0H+Q8bdnLPdqUYnvboJT0bn/229qg==",
       "license": "MIT",
       "funding": {
         "url": "https://github.com/sponsors/colinhacks"
diff --git a/package.json b/package.json
index 97ac586..a92faf8 100644
--- a/package.json
+++ b/package.json
@@ -54,7 +54,7 @@
     "bs58": "6.0.0",
     "elliptic": "6.6.1",
     "lodash": "4.17.21",
-    "zod": "3.25.76"
+    "zod": "4.1.5"
   },
   "devDependencies": {
     "@types/bs58": "4.0.4",