diff --git a/js/ragas.ts b/js/ragas.ts
index 2c89a975..553dda70 100644
--- a/js/ragas.ts
+++ b/js/ragas.ts
@@ -109,7 +109,7 @@ import OpenAI from "openai";
 import { ListContains } from "./list";
 import { EmbeddingSimilarity } from "./string";
 import { z } from "zod";
-import zodToJsonSchema from "zod-to-json-schema";
+import { zodToJsonSchema } from "./zod-utils";
 import { makePartial, ScorerWithPartial } from "./partial";
 
 type RagasArgs = {
diff --git a/js/zod-utils.ts b/js/zod-utils.ts
new file mode 100644
index 00000000..3c11667c
--- /dev/null
+++ b/js/zod-utils.ts
@@ -0,0 +1,22 @@
+import { zodToJsonSchema as zodToJsonSchemaV3 } from "zod-to-json-schema";
+import * as z3 from "zod/v3";
+import * as z4 from "zod/v4";
+
+function isZodV4(zodObject: z3.ZodType | z4.ZodType): zodObject is z4.ZodType {
+  return (
+    typeof zodObject === "object" &&
+    zodObject !== null &&
+    "_zod" in zodObject &&
+    zodObject._zod !== undefined
+  );
+}
+
+export function zodToJsonSchema(schema: z4.ZodType | z3.ZodType) {
+  if (isZodV4(schema)) {
+    return z4.toJSONSchema(schema, {
+      target: "draft-7",
+    });
+  }
+
+  return zodToJsonSchemaV3(schema);
+}
diff --git a/package.json b/package.json
index b7b42e0c..5de55294 100644
--- a/package.json
+++ b/package.json
@@ -55,7 +55,8 @@
     "typedoc": "^0.25.13",
     "typedoc-plugin-markdown": "^3.17.1",
     "typescript": "^5.9.2",
-    "vitest": "^2.1.9"
+    "vitest": "^2.1.9",
+    "zod": "^3.25.34"
   },
   "dependencies": {
     "ajv": "^8.17.1",
@@ -65,8 +66,10 @@
     "linear-sum-assignment": "^1.0.7",
     "mustache": "^4.2.0",
     "openai": "^6.3.0",
-    "zod": "^3.25.76",
     "zod-to-json-schema": "^3.24.6"
   },
+  "peerDependencies": {
+    "zod": "^3.25.34 || ^4.0"
+  },
   "packageManager": "pnpm@10.33.0"
 }