diff --git a/help/_posts/1970-01-01-ubuntu.md b/help/_posts/1970-01-01-ubuntu.md
index fc979bd..65b5173 100644
--- a/help/_posts/1970-01-01-ubuntu.md
+++ b/help/_posts/1970-01-01-ubuntu.md
@@ -23,7 +23,7 @@ TUNA 的软件源镜像。
 	  <option data-release="focal" selected>20.04 LTS</option>
 	  <option data-release="eoan">19.10</option>
 	  <option data-release="groovy">20.10</option>
-		<option data-release="hirsute">21.10</option>
+		<option data-release="hirsute">21.04</option>
 	</select>
 </div>
 </form>