diff --git a/src/rpc/server.ts b/src/rpc/server.ts
index 1a74363..d0d6b16 100644
--- a/src/rpc/server.ts
+++ b/src/rpc/server.ts
@@ -15,8 +15,8 @@ import stringify from "json-stable-stringify";
 import Ajv from "ajv";
 import RPCConnection from "./connection.js";
 
-const ajv = new Ajv();
-ajv.addSchema(RPC_REQUEST_SCHEMA, "rpc_request");
+const ajv = new Ajv({ allowUnionTypes: true });
+const validateRpcRequest = ajv.compile(RPC_REQUEST_SCHEMA);
 
 let server: RPCServer;
 
@@ -193,9 +193,10 @@ export class RPCServer {
   }
 
   private verifyRequest(request: RPCRequest) {
-    let valid: any = ajv.getSchema("rpc_request")?.(request);
+    let valid: boolean | Error | RPCMethod = validateRpcRequest(request);
+
     if (!valid) {
-      return new Error("Invalid request");
+      return new Error(ajv.errorsText(validateRpcRequest.errors));
     }
 
     valid = this.getMethodByRequest(request);
diff --git a/src/types.ts b/src/types.ts
index 9e8fee9..00e7a53 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -34,14 +34,7 @@ export const RPC_REQUEST_SCHEMA: JSONSchemaType<RPCRequest> = {
       type: "string",
     },
     data: {
-      type: "string",
-      anyOf: [
-        { type: "string" },
-        { type: "number" },
-        { type: "integer" },
-        { type: "object" },
-        { type: "array" },
-      ],
+      type: ["number", "string", "boolean", "object", "array"],
     },
     bypassCache: {
       type: "boolean",