diff --git a/extensions/flags/composer.json b/extensions/flags/composer.json
index c7b8b1d383..b71469275c 100644
--- a/extensions/flags/composer.json
+++ b/extensions/flags/composer.json
@@ -19,7 +19,7 @@
         }
     ],
     "require": {
-        "flarum/core": "^1.8"
+        "flarum/core": "^1.8.6"
     },
     "autoload": {
         "psr-4": {