diff --git a/Dockerfile.mcp b/Dockerfile.mcp
index aed6ae3..23f1d57 100644
--- a/Dockerfile.mcp
+++ b/Dockerfile.mcp
@@ -6,7 +6,7 @@ WORKDIR /app
 COPY package.json package-lock.json ./
 RUN npm ci --ignore-scripts
 
-COPY tsconfig.json tsconfig.tests.json tsup.config.ts ./
+COPY tsconfig.json tsconfig.tests.json tsdown.config.ts ./
 COPY src ./src
 RUN npm run build:runtime && npm prune --omit=dev
 
diff --git a/tests/unit/mcp-distribution.test.ts b/tests/unit/mcp-distribution.test.ts
index 0b02f73..b133003 100644
--- a/tests/unit/mcp-distribution.test.ts
+++ b/tests/unit/mcp-distribution.test.ts
@@ -34,6 +34,8 @@ describe('MCP OCI distribution', () => {
     expect(workflow).not.toContain('npm publish');
     expect(dockerfile).toContain('io.modelcontextprotocol.server.name="io.github.sandbaseai/sandbase-harness"');
     expect(dockerfile).toContain('RUN npm ci --ignore-scripts');
+    expect(dockerfile).toContain('COPY tsconfig.json tsconfig.tests.json tsdown.config.ts ./');
+    expect(dockerfile).not.toContain('tsup.config.ts');
     expect(dockerfile).toContain('RUN npm run build:runtime && npm prune --omit=dev');
   });