diff --git a/packages/mermaid-mindmap/package.json b/packages/mermaid-mindmap/package.json
index 0f1a98303..e79e2df4f 100644
--- a/packages/mermaid-mindmap/package.json
+++ b/packages/mermaid-mindmap/package.json
@@ -47,6 +47,7 @@
     "non-layered-tidy-tree-layout": "^2.0.2"
   },
   "devDependencies": {
+    "@types/cytoscape": "^3.19.9",
     "concurrently": "^7.5.0",
     "mermaid": "workspace:*",
     "rimraf": "^3.0.2"