diff --git a/W/WebIO/Versions.toml b/W/WebIO/Versions.toml
index ccd1d81025ce0f2..4f25324fc57e9a1 100644
--- a/W/WebIO/Versions.toml
+++ b/W/WebIO/Versions.toml
@@ -100,3 +100,6 @@ git-tree-sha1 = "55ea1b43214edb1f6a228105a219c6e84f1f5533"
 
 ["0.8.20"]
 git-tree-sha1 = "976d0738247f155d0dcd77607edea644f069e1e9"
+
+["0.8.21"]
+git-tree-sha1 = "0eef0765186f7452e52236fa42ca8c9b3c11c6e3"