diff --git a/npm/vite-dev-server/src/resolveConfig.ts b/npm/vite-dev-server/src/resolveConfig.ts
index b9f473383487..b7123447c058 100644
--- a/npm/vite-dev-server/src/resolveConfig.ts
+++ b/npm/vite-dev-server/src/resolveConfig.ts
@@ -112,6 +112,9 @@ function makeCypressViteConfig (config: ViteDevServerConfig, vite: Vite): Inline
           projectRoot,
           vitePathNodeModules,
           cypressBinaryRoot,
+          // Allow in monorepo: https://vitejs.dev/config/server-options.html#server-fs-allow
+          // Supported from Vite v3 - add null check for v2 users.
+          vite.searchForWorkspaceRoot?.(process.cwd()),
         ],
       },
       host: '127.0.0.1',