diff --git a/wasm/demo/package.json b/wasm/demo/package.json
index c875132508..e745c2868f 100644
--- a/wasm/demo/package.json
+++ b/wasm/demo/package.json
@@ -4,7 +4,7 @@
     "description": "Bindings to the RustPython library for WebAssembly",
     "main": "index.js",
     "dependencies": {
-        "codemirror": "^5.42.0",
+        "codemirror": "^6.0.0",
         "local-echo": "^0.2.0",
         "xterm": "^3.8.0"
     },