diff --git a/W/WebIO/Compat.toml b/W/WebIO/Compat.toml
index 536783d49cace2f..dd369994552dd50 100644
--- a/W/WebIO/Compat.toml
+++ b/W/WebIO/Compat.toml
@@ -48,9 +48,12 @@ Observables = "0.2.3-0.3"
 ["0.8.16-0.8.17"]
 Observables = "0.3-0.4"
 
-["0.8.18-0"]
+["0.8.18"]
 Observables = "0.3-0.5"
 
+["0.8.20-0"]
+Observables = "0.5"
+
 ["0.8.3-0.8.11"]
 Compat = "0.0.0-3"
 JSON = "0.0.0-0.21"
diff --git a/W/WebIO/Versions.toml b/W/WebIO/Versions.toml
index ad0d9cb6494bd88..0e12e361947dc4d 100644
--- a/W/WebIO/Versions.toml
+++ b/W/WebIO/Versions.toml
@@ -93,3 +93,6 @@ git-tree-sha1 = "c9529be473e97fa0b3b2642cdafcd0896b4c9494"
 
 ["0.8.18"]
 git-tree-sha1 = "a8bbcd0b08061bba794c56fb78426e96e114ae7f"
+
+["0.8.20"]
+git-tree-sha1 = "47feba0382ee74e1b76fa2056983e59082cd1806"