diff --git a/package-lock.json b/package-lock.json
index 4797b60c6..b29ef11fd 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
     "name": "@modelcontextprotocol/sdk",
-    "version": "1.21.0",
+    "version": "1.21.1",
     "lockfileVersion": 3,
     "requires": true,
     "packages": {
         "": {
             "name": "@modelcontextprotocol/sdk",
-            "version": "1.21.0",
+            "version": "1.21.1",
             "license": "MIT",
             "dependencies": {
                 "ajv": "^8.17.1",
diff --git a/package.json b/package.json
index 32951d17b..5c595515d 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
     "name": "@modelcontextprotocol/sdk",
-    "version": "1.21.0",
+    "version": "1.21.1",
     "description": "Model Context Protocol implementation for TypeScript",
     "license": "MIT",
     "author": "Anthropic, PBC (https://anthropic.com)",