diff --git a/package-lock.json b/package-lock.json
index 40bad9fe..77a56058 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@modelcontextprotocol/sdk",
-  "version": "1.11.4",
+  "version": "1.12.1",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@modelcontextprotocol/sdk",
-      "version": "1.11.4",
+      "version": "1.12.1",
       "license": "MIT",
       "dependencies": {
         "ajv": "^6.12.6",
@@ -29,12 +29,14 @@
         "@types/cross-spawn": "^6.0.6",
         "@types/eslint__js": "^8.42.3",
         "@types/eventsource": "^1.1.15",
-        "@types/express": "^5.0.0",
+        "@types/express": "^5.0.2",
+        "@types/express-serve-static-core": "^5.0.6",
         "@types/jest": "^29.5.12",
         "@types/node": "^22.0.2",
         "@types/supertest": "^6.0.2",
         "@types/ws": "^8.5.12",
         "eslint": "^9.8.0",
+        "eventsource-parser": "^3.0.2",
         "jest": "^29.7.0",
         "supertest": "^7.0.0",
         "ts-jest": "^29.2.4",
@@ -1743,15 +1745,14 @@
       "dev": true
     },
     "node_modules/@types/express": {
-      "version": "5.0.0",
-      "resolved": "https://registry.npmjs.org/@types/express/-/express-5.0.0.tgz",
-      "integrity": "sha512-DvZriSMehGHL1ZNLzi6MidnsDhUZM/x2pRdDIKdwbUNqqwHxMlRdkxtn6/EPKyqKpHqTl/4nRZsRNLpZxZRpPQ==",
+      "version": "5.0.2",
+      "resolved": "https://registry.npmjs.org/@types/express/-/express-5.0.2.tgz",
+      "integrity": "sha512-BtjL3ZwbCQriyb0DGw+Rt12qAXPiBTPs815lsUvtt1Grk0vLRMZNMUZ741d5rjk+UQOxfDiBZ3dxpX00vSkK3g==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
         "@types/body-parser": "*",
         "@types/express-serve-static-core": "^5.0.0",
-        "@types/qs": "*",
         "@types/serve-static": "*"
       }
     },
@@ -3311,9 +3312,9 @@
       }
     },
     "node_modules/eventsource-parser": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/eventsource-parser/-/eventsource-parser-3.0.0.tgz",
-      "integrity": "sha512-T1C0XCUimhxVQzW4zFipdx0SficT651NnkR0ZSH3yQwh+mFMdLfgjABVi4YtMTtaL4s168593DaoaRLMqryavA==",
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/eventsource-parser/-/eventsource-parser-3.0.2.tgz",
+      "integrity": "sha512-6RxOBZ/cYgd8usLwsEl+EC09Au/9BcmCKYF2/xbml6DNczf7nv0MQb+7BA2F+li6//I+28VNlQR37XfQtcAJuA==",
       "license": "MIT",
       "engines": {
         "node": ">=18.0.0"
diff --git a/package.json b/package.json
index fb1dd3cf..37356e5e 100644
--- a/package.json
+++ b/package.json
@@ -66,12 +66,14 @@
     "@types/cross-spawn": "^6.0.6",
     "@types/eslint__js": "^8.42.3",
     "@types/eventsource": "^1.1.15",
-    "@types/express": "^5.0.0",
+    "@types/express": "^5.0.2",
+    "@types/express-serve-static-core": "^5.0.6",
     "@types/jest": "^29.5.12",
     "@types/node": "^22.0.2",
     "@types/supertest": "^6.0.2",
     "@types/ws": "^8.5.12",
     "eslint": "^9.8.0",
+    "eventsource-parser": "^3.0.2",
     "jest": "^29.7.0",
     "supertest": "^7.0.0",
     "ts-jest": "^29.2.4",