diff --git a/Casks/z/zotero.rb b/Casks/z/zotero.rb
index 3b82f7f7c7..e65154e4f6 100644
--- a/Casks/z/zotero.rb
+++ b/Casks/z/zotero.rb
@@ -13,6 +13,7 @@ cask "zotero" do
   end
 
   auto_updates true
+  conflicts_with cask: "homebrew/cask-versions/zotero-beta"
 
   app "Zotero.app"