diff --git a/package.json b/package.json
index 7c7b054..c0d9182 100644
--- a/package.json
+++ b/package.json
@@ -115,7 +115,7 @@
     "koa-serve-index": "^1.1.1",
     "koa-static": "^5.0.0",
     "koa-webpack-dev-middleware": "^2.0.2",
-    "less": "^3.9.0",
+    "less": "~3.9.0",
     "less-loader": "^4.1.0",
     "match-require": "2.x",
     "merge2": "~1.2.3",