diff --git a/schema.json b/schema.json
index 2615fef..6afe2c1 100644
--- a/schema.json
+++ b/schema.json
@@ -54,6 +54,7 @@
           {
             "schema": {
               "type": "string",
+              "nullable": true,
               "description": "Fully-qualified hostname to update, for example nas.example.com."
             },
             "required": false,
@@ -64,6 +65,7 @@
           {
             "schema": {
               "type": "string",
+              "nullable": true,
               "description": "Client-supplied IPv4 or IPv6 address. Invalid values are ignored in favor of CF-Connecting-IP."
             },
             "required": false,
@@ -74,6 +76,7 @@
           {
             "schema": {
               "type": "string",
+              "nullable": true,
               "description": "Unused by this worker, but included for Synology DynDNS2 compatibility."
             },
             "required": false,
@@ -84,6 +87,7 @@
           {
             "schema": {
               "type": "string",
+              "nullable": true,
               "description": "Shared secret used to authenticate the update request."
             },
             "required": false,
diff --git a/src/endpoints/synology.ts b/src/endpoints/synology.ts
index f9f433e..8fbcc6b 100644
--- a/src/endpoints/synology.ts
+++ b/src/endpoints/synology.ts
@@ -24,17 +24,17 @@ import { z } from "zod";
 const SynologyQuery = z.object({
 	hostname: z
 		.string()
-		.optional()
+		.nullish()
 		.describe("Fully-qualified hostname to update, for example nas.example.com."),
 	myip: z
 		.string()
-		.optional()
+		.nullish()
 		.describe("Client-supplied IPv4 or IPv6 address. Invalid values are ignored in favor of CF-Connecting-IP."),
 	username: z
 		.string()
-		.optional()
+		.nullish()
 		.describe("Unused by this worker, but included for Synology DynDNS2 compatibility."),
-	password: z.string().optional().describe("Shared secret used to authenticate the update request."),
+	password: z.string().nullish().describe("Shared secret used to authenticate the update request."),
 });
 
 /**