diff --git a/.ruby-version b/.ruby-version
new file mode 100644
index 00000000..35d16fb1
--- /dev/null
+++ b/.ruby-version
@@ -0,0 +1 @@
+2.5.7
diff --git a/app/decorators/group_member_decorator.rb b/app/decorators/group_member_decorator.rb
index e021349e..f55a403f 100644
--- a/app/decorators/group_member_decorator.rb
+++ b/app/decorators/group_member_decorator.rb
@@ -55,7 +55,8 @@ def inactivate_user_button(group)
               group_membership_inactivate_path(group.id, membership_id),
               method: :post, remote: true,
               class: 'uk-button uk-button-primary uk-button-small uk-width-auto',
-              id: "inactive-button-#{membership_id}"
+              id: "inactive-button-#{membership_id}",
+              data: { confirm: "Biztos, hogy öreggé szeretnéd avatni #{user.full_name}-t?" }
   end
 
   def archive_user_button(group)