diff --git a/package.json b/package.json
index f91eab4..be558c6 100644
--- a/package.json
+++ b/package.json
@@ -79,7 +79,7 @@
     "tsx": "^4.20.3",
     "typescript": "^5.8.3",
     "yargs": "^18.0.0",
-    "zod": "^3.23.8",
+    "zod": "^4.0.0",
     "zod-validation-error": "^4.0.1"
   },
   "devDependencies": {
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 491f40a..950f0c4 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -16,7 +16,7 @@ importers:
         version: 4.10.2(puppeteer@24.19.0(typescript@5.9.2))
       '@genkit-ai/compat-oai':
         specifier: ^1.19.1
-        version: 1.19.1(encoding@0.1.13)(genkit@1.19.1(@google-cloud/firestore@7.11.3(encoding@0.1.13))(encoding@0.1.13)(firebase-admin@13.5.0(encoding@0.1.13)))(ws@8.18.3)(zod@3.25.76)
+        version: 1.19.1(encoding@0.1.13)(genkit@1.19.1(@google-cloud/firestore@7.11.3(encoding@0.1.13))(encoding@0.1.13)(firebase-admin@13.5.0(encoding@0.1.13)))(ws@8.18.3)(zod@4.1.9)
       '@genkit-ai/googleai':
         specifier: 1.19.1
         version: 1.19.1(encoding@0.1.13)(genkit@1.19.1(@google-cloud/firestore@7.11.3(encoding@0.1.13))(encoding@0.1.13)(firebase-admin@13.5.0(encoding@0.1.13)))
@@ -114,11 +114,11 @@ importers:
         specifier: ^18.0.0
         version: 18.0.0
       zod:
-        specifier: ^3.23.8
-        version: 3.25.76
+        specifier: ^4.0.0
+        version: 4.1.9
       zod-validation-error:
         specifier: ^4.0.1
-        version: 4.0.1(zod@3.25.76)
+        version: 4.0.1(zod@4.1.9)
     devDependencies:
       prettier:
         specifier: ^3.5.3
@@ -6224,6 +6224,9 @@ packages:
   zod@3.25.76:
     resolution: {integrity: sha512-gzUt/qt81nXsFGKIFcC3YnfEAx5NkunCfnDlvuBSSFS02bcXu4Lmea0AFIUwbLWxWPx3d9p8S5QoaujKcNQxcQ==}
 
+  zod@4.1.9:
+    resolution: {integrity: sha512-HI32jTq0AUAC125z30E8bQNz0RQ+9Uc+4J7V97gLYjZVKRjeydPgGt6dvQzFrav7MYOUGFqqOGiHpA/fdbd0cQ==}
+
   zone.js@0.15.1:
     resolution: {integrity: sha512-XE96n56IQpJM7NAoXswY3XRLcWFW83xe0BiAOeMD7K5k5xecOeul3Qcpx6GqEeeHNkW5DWL5zOyTbEfB4eti8w==}
 
@@ -6928,10 +6931,10 @@ snapshots:
       - genkit
       - supports-color
 
-  '@genkit-ai/compat-oai@1.19.1(encoding@0.1.13)(genkit@1.19.1(@google-cloud/firestore@7.11.3(encoding@0.1.13))(encoding@0.1.13)(firebase-admin@13.5.0(encoding@0.1.13)))(ws@8.18.3)(zod@3.25.76)':
+  '@genkit-ai/compat-oai@1.19.1(encoding@0.1.13)(genkit@1.19.1(@google-cloud/firestore@7.11.3(encoding@0.1.13))(encoding@0.1.13)(firebase-admin@13.5.0(encoding@0.1.13)))(ws@8.18.3)(zod@4.1.9)':
     dependencies:
       genkit: 1.19.1(@google-cloud/firestore@7.11.3(encoding@0.1.13))(encoding@0.1.13)(firebase-admin@13.5.0(encoding@0.1.13))
-      openai: 4.104.0(encoding@0.1.13)(ws@8.18.3)(zod@3.25.76)
+      openai: 4.104.0(encoding@0.1.13)(ws@8.18.3)(zod@4.1.9)
     transitivePeerDependencies:
       - encoding
       - ws
@@ -11791,7 +11794,7 @@ snapshots:
       is-inside-container: 1.0.0
       wsl-utils: 0.1.0
 
-  openai@4.104.0(encoding@0.1.13)(ws@8.18.3)(zod@3.25.76):
+  openai@4.104.0(encoding@0.1.13)(ws@8.18.3)(zod@4.1.9):
     dependencies:
       '@types/node': 18.19.124
       '@types/node-fetch': 2.6.13
@@ -11802,7 +11805,7 @@ snapshots:
       node-fetch: 2.7.0(encoding@0.1.13)
     optionalDependencies:
       ws: 8.18.3
-      zod: 3.25.76
+      zod: 4.1.9
     transitivePeerDependencies:
       - encoding
 
@@ -13356,12 +13359,14 @@ snapshots:
     dependencies:
       zod: 3.25.76
 
-  zod-validation-error@4.0.1(zod@3.25.76):
+  zod-validation-error@4.0.1(zod@4.1.9):
     dependencies:
-      zod: 3.25.76
+      zod: 4.1.9
 
   zod@3.25.76: {}
 
+  zod@4.1.9: {}
+
   zone.js@0.15.1: {}
 
   zwitch@2.0.4: {}