diff --git a/composer.json b/composer.json
index 839a6d2..07f86d6 100644
--- a/composer.json
+++ b/composer.json
@@ -19,7 +19,7 @@
     ],
     "require": {
         "yiisoft/yii2": "*",
-        "bower-asset/bootstrap": "~3.2"
+        "bower-asset/bootstrap": "3.2.* | ~3.1"
     },
     "autoload": {
         "psr-4": {