diff --git a/package.json b/package.json
index de7ec6d..1648956 100644
--- a/package.json
+++ b/package.json
@@ -181,7 +181,7 @@
         "cookie": "^1.0.2",
         "hono": "^4.9.7",
         "openapi-types": "^12.1.3",
-        "zod": "^3.25.76"
+        "zod": "^4.2.1"
     },
     "devDependencies": {
         "@commitlint/cli": "^19.8.1",
@@ -208,7 +208,7 @@
         "@sinclair/typebox": "^0.34.33",
         "hono": "^4.7.7",
         "openapi-types": "^12.1.3",
-        "zod": "^3.24.3"
+        "zod": "^4.2.1"
     },
     "packageManager": "pnpm@10.9.0"
 }
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 9b86db2..95603c6 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -10,7 +10,7 @@ importers:
     dependencies:
       '@anatine/zod-openapi':
         specifier: ^2.2.8
-        version: 2.2.8(openapi3-ts@4.4.0)(zod@3.25.76)
+        version: 2.2.8(openapi3-ts@4.4.0)(zod@4.2.1)
       '@sinclair/typebox':
         specifier: ^0.34.41
         version: 0.34.41
@@ -24,8 +24,8 @@ importers:
         specifier: ^12.1.3
         version: 12.1.3
       zod:
-        specifier: ^3.25.76
-        version: 3.25.76
+        specifier: ^4.2.1
+        version: 4.2.1
     devDependencies:
       '@commitlint/cli':
         specifier: ^19.8.1
@@ -2949,8 +2949,8 @@ packages:
   zod@3.24.1:
     resolution: {integrity: sha512-muH7gBL9sI1nciMZV67X5fTKKBLtwpZ5VBp1vsOQzj1MhrBZ4wlVCm3gedKZWLp0Oyel8sIGfeiz54Su+OVT+A==}
 
-  zod@3.25.76:
-    resolution: {integrity: sha512-gzUt/qt81nXsFGKIFcC3YnfEAx5NkunCfnDlvuBSSFS02bcXu4Lmea0AFIUwbLWxWPx3d9p8S5QoaujKcNQxcQ==}
+  zod@4.2.1:
+    resolution: {integrity: sha512-0wZ1IRqGGhMP76gLqz8EyfBXKk0J2qo2+H3fi4mcUP/KtTocoX08nmIAHl1Z2kJIZbZee8KOpBCSNPRgauucjw==}
 
   zwitch@2.0.4:
     resolution: {integrity: sha512-bXE4cR/kVZhKZX/RjPEflHaKVhUVl85noU3v6b8apfQEc1x4A+zBxjZ4lN8LqGd6WZ3dl98pY4o717VFmoPp+A==}
@@ -3069,11 +3069,11 @@ snapshots:
     dependencies:
       '@algolia/client-common': 5.37.0
 
-  '@anatine/zod-openapi@2.2.8(openapi3-ts@4.4.0)(zod@3.25.76)':
+  '@anatine/zod-openapi@2.2.8(openapi3-ts@4.4.0)(zod@4.2.1)':
     dependencies:
       openapi3-ts: 4.4.0
       ts-deepmerge: 6.2.1
-      zod: 3.25.76
+      zod: 4.2.1
 
   '@babel/code-frame@7.27.1':
     dependencies:
@@ -5987,6 +5987,6 @@ snapshots:
 
   zod@3.24.1: {}
 
-  zod@3.25.76: {}
+  zod@4.2.1: {}
 
   zwitch@2.0.4: {}