diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 1ca5b2e..c52f98f 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -20,6 +20,10 @@ jobs:
           cache: npm
 
       - run: npm ci
+      - name: Build MCP SDK from GitHub source
+        run: |
+          cd node_modules/@modelcontextprotocol/sdk
+          npm install
       - run: npm run build
       - run: npm test