diff --git a/ui/src/components/rects/ThouCanvas.vue b/ui/src/components/rects/ThouCanvas.vue
index f47261f..cf6d138 100644
--- a/ui/src/components/rects/ThouCanvas.vue
+++ b/ui/src/components/rects/ThouCanvas.vue
@@ -1,6 +1,7 @@
 <template>
   <svg
     xmlns="http://www.w3.org/2000/svg"
+    version="1.1"
     viewBox="0 0 1000 1000"
     preserveAspectRatio="none"
     @contextmenu.prevent