diff --git a/package-lock.json b/package-lock.json
index f6dba7c..0fa5c69 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,7 +9,7 @@
       "version": "1.0.0",
       "license": "MIT",
       "dependencies": {
-        "zod": "^3.23.8"
+        "zod": "^4.0.0"
       },
       "devDependencies": {
         "@total-typescript/exercise-cli": "^0.11.0",
@@ -2652,10 +2652,9 @@
       "license": "MIT"
     },
     "node_modules/zod": {
-      "version": "3.24.2",
-      "resolved": "https://registry.npmjs.org/zod/-/zod-3.24.2.tgz",
-      "integrity": "sha512-lY7CDW43ECgW9u1TcT3IoXHflywfVqDYze4waEz812jR/bZ8FHDsl7pFQoSZTz5N+2NqRXs8GBwnAwo3ZNxqhQ==",
-      "license": "MIT",
+      "version": "4.1.12",
+      "resolved": "https://registry.npmjs.org/zod/-/zod-4.1.12.tgz",
+      "integrity": "sha512-JInaHOamG8pt5+Ey8kGmdcAcg3OL9reK8ltczgHTAwNhMys/6ThXHityHxVV2p3fkw/c+MAvBHFVYHFZDmjMCQ==",
       "funding": {
         "url": "https://github.com/sponsors/colinhacks"
       }
diff --git a/package.json b/package.json
index 08e1ec5..9813f92 100644
--- a/package.json
+++ b/package.json
@@ -42,7 +42,7 @@
     "s-10": "tt-cli run 10 --solution"
   },
   "dependencies": {
-    "zod": "^3.23.8"
+    "zod": "^4.0.0"
   },
   "type": "module"
 }
\ No newline at end of file