diff --git a/project/Version.scala b/project/Version.scala
index 8cb94407..7b017f3c 100644
--- a/project/Version.scala
+++ b/project/Version.scala
@@ -3,7 +3,7 @@ object Version {
 
   val circeDerivation = "0.12.0-M7"
 
-  val tethys = "0.11.0"
+  val tethys = "0.20.0"
 
   val akka = "2.6.11"