diff --git a/package-lock.json b/package-lock.json
index 2f745d59b..c266bf3aa 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@modelcontextprotocol/sdk",
-  "version": "0.1.0",
+  "version": "0.3.2",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@modelcontextprotocol/sdk",
-      "version": "0.1.0",
+      "version": "0.3.2",
       "dependencies": {
         "content-type": "^1.0.5",
         "raw-body": "^3.0.0",
diff --git a/package.json b/package.json
index b1476160e..9d55b1a09 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@modelcontextprotocol/sdk",
-  "version": "0.3.1",
+  "version": "0.3.2",
   "description": "Model Context Protocol implementation for TypeScript",
   "type": "module",
   "main": "./dist/index.js",
diff --git a/src/types.ts b/src/types.ts
index f932699eb..1d147aa92 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -719,7 +719,7 @@ export const CallToolResultSchema = ResultSchema.extend({
   content: z.array(
     z.union([TextContentSchema, ImageContentSchema, EmbeddedResourceSchema]),
   ),
-  isError: z.boolean(),
+  isError: z.boolean().default(false),
 });
 
 /**