diff --git a/package.json b/package.json
index 6218216e..2111d18d 100644
--- a/package.json
+++ b/package.json
@@ -197,6 +197,6 @@
     "usehooks-ts": "^3.1.0",
     "viem": "^2.16.1",
     "world-countries": "^5.0.0",
-    "zod": "^3.25.76"
+    "zod": "^4.3.5"
   }
 }
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 6aacdc70..c6eea90d 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -133,13 +133,13 @@ importers:
         version: 3.1.1(react@19.2.0)
       viem:
         specifier: ^2.16.1
-        version: 2.38.2(typescript@5.9.3)(zod@3.25.76)
+        version: 2.38.2(typescript@5.9.3)(zod@4.3.5)
       world-countries:
         specifier: ^5.0.0
         version: 5.1.0
       zod:
-        specifier: ^3.25.76
-        version: 3.25.76
+        specifier: ^4.3.5
+        version: 4.3.5
     devDependencies:
       '@commitlint/cli':
         specifier: ^20.1.0
@@ -5618,8 +5618,8 @@ packages:
     peerDependencies:
       zod: ^3.25.0 || ^4.0.0
 
-  zod@3.25.76:
-    resolution: {integrity: sha512-gzUt/qt81nXsFGKIFcC3YnfEAx5NkunCfnDlvuBSSFS02bcXu4Lmea0AFIUwbLWxWPx3d9p8S5QoaujKcNQxcQ==}
+  zod@4.3.5:
+    resolution: {integrity: sha512-k7Nwx6vuWx1IJ9Bjuf4Zt1PEllcwe7cls3VNzm4CQ1/hgtFUK2bRNG3rvnpPUhFjmqJKAKtjV576KnUkHocg/g==}
 
   zwitch@2.0.4:
     resolution: {integrity: sha512-bXE4cR/kVZhKZX/RjPEflHaKVhUVl85noU3v6b8apfQEc1x4A+zBxjZ4lN8LqGd6WZ3dl98pY4o717VFmoPp+A==}
@@ -7778,10 +7778,10 @@ snapshots:
       jsonparse: 1.3.1
       through: 2.3.8
 
-  abitype@1.1.0(typescript@5.9.3)(zod@3.25.76):
+  abitype@1.1.0(typescript@5.9.3)(zod@4.3.5):
     optionalDependencies:
       typescript: 5.9.3
-      zod: 3.25.76
+      zod: 4.3.5
 
   acorn-jsx@5.3.2(acorn@8.15.0):
     dependencies:
@@ -8557,8 +8557,8 @@ snapshots:
       '@babel/parser': 7.28.4
       eslint: 9.37.0(jiti@2.6.1)
       hermes-parser: 0.25.1
-      zod: 3.25.76
-      zod-validation-error: 4.0.2(zod@3.25.76)
+      zod: 4.3.5
+      zod-validation-error: 4.0.2(zod@4.3.5)
     transitivePeerDependencies:
       - supports-color
 
@@ -10036,7 +10036,7 @@ snapshots:
       object-keys: 1.1.1
       safe-push-apply: 1.0.0
 
-  ox@0.9.6(typescript@5.9.3)(zod@3.25.76):
+  ox@0.9.6(typescript@5.9.3)(zod@4.3.5):
     dependencies:
       '@adraffy/ens-normalize': 1.11.1
       '@noble/ciphers': 1.3.0
@@ -10044,7 +10044,7 @@ snapshots:
       '@noble/hashes': 1.8.0
       '@scure/bip32': 1.7.0
       '@scure/bip39': 1.6.0
-      abitype: 1.1.0(typescript@5.9.3)(zod@3.25.76)
+      abitype: 1.1.0(typescript@5.9.3)(zod@4.3.5)
       eventemitter3: 5.0.1
     optionalDependencies:
       typescript: 5.9.3
@@ -11160,15 +11160,15 @@ snapshots:
       '@types/unist': 3.0.3
       vfile-message: 4.0.3
 
-  viem@2.38.2(typescript@5.9.3)(zod@3.25.76):
+  viem@2.38.2(typescript@5.9.3)(zod@4.3.5):
     dependencies:
       '@noble/curves': 1.9.1
       '@noble/hashes': 1.8.0
       '@scure/bip32': 1.7.0
       '@scure/bip39': 1.6.0
-      abitype: 1.1.0(typescript@5.9.3)(zod@3.25.76)
+      abitype: 1.1.0(typescript@5.9.3)(zod@4.3.5)
       isows: 1.0.7(ws@8.18.3)
-      ox: 0.9.6(typescript@5.9.3)(zod@3.25.76)
+      ox: 0.9.6(typescript@5.9.3)(zod@4.3.5)
       ws: 8.18.3
     optionalDependencies:
       typescript: 5.9.3
@@ -11394,10 +11394,10 @@ snapshots:
 
   yoctocolors@2.1.2: {}
 
-  zod-validation-error@4.0.2(zod@3.25.76):
+  zod-validation-error@4.0.2(zod@4.3.5):
     dependencies:
-      zod: 3.25.76
+      zod: 4.3.5
 
-  zod@3.25.76: {}
+  zod@4.3.5: {}
 
   zwitch@2.0.4: {}
diff --git a/src/scalars/graphql/Date.ts b/src/scalars/graphql/Date.ts
index 03bbd094..f31bface 100644
--- a/src/scalars/graphql/Date.ts
+++ b/src/scalars/graphql/Date.ts
@@ -10,9 +10,9 @@ export const type = 'string'
 
 export const typedef = 'scalar Date'
 
-export const schema = z.string().datetime()
+export const schema = z.iso.datetime()
 
-export const stringSchema = 'z.string().datetime()'
+export const stringSchema = 'z.iso.datetime()'
 
 const datetimeValidation = (value: unknown): string => {
   if (typeof value !== 'string') {
diff --git a/src/scalars/graphql/DateTime.ts b/src/scalars/graphql/DateTime.ts
index f723b19d..21f4358a 100644
--- a/src/scalars/graphql/DateTime.ts
+++ b/src/scalars/graphql/DateTime.ts
@@ -10,9 +10,9 @@ export const type = 'string'
 
 export const typedef = 'scalar DateTime'
 
-export const schema = z.string().datetime()
+export const schema = z.iso.datetime()
 
-export const stringSchema = 'z.string().datetime()'
+export const stringSchema = 'z.iso.datetime()'
 
 const datetimeValidation = (value: unknown): string => {
   if (typeof value !== 'string') {
diff --git a/src/scalars/graphql/EmailAddress.ts b/src/scalars/graphql/EmailAddress.ts
index bdf850c9..2c5d720d 100644
--- a/src/scalars/graphql/EmailAddress.ts
+++ b/src/scalars/graphql/EmailAddress.ts
@@ -10,9 +10,9 @@ export const type = 'string' // TS type in string form
 
 export const typedef = 'scalar EmailAddress'
 
-export const schema = z.string().email()
+export const schema = z.email()
 
-export const stringSchema = 'z.string().email()'
+export const stringSchema = 'z.email()'
 
 const emailValidation = (value: unknown): string => {
   if (typeof value !== 'string') {
diff --git a/src/scalars/graphql/URL.ts b/src/scalars/graphql/URL.ts
index 04366807..7ce0b829 100644
--- a/src/scalars/graphql/URL.ts
+++ b/src/scalars/graphql/URL.ts
@@ -10,9 +10,9 @@ export const type = 'string'
 
 export const typedef = 'scalar URL'
 
-export const schema = z.string().url()
+export const schema = z.url()
 
-export const stringSchema = 'z.string().url()'
+export const stringSchema = 'z.url()'
 
 const urlValidation = (value: unknown): string => {
   if (typeof value !== 'string') {