diff --git a/build.sbt b/build.sbt
index f30897ce..47d382c2 100644
--- a/build.sbt
+++ b/build.sbt
@@ -32,7 +32,7 @@ inThisBuild(
       ),
       Developer("justcoon", "Peter Kotula", "peto.kotula@yahoo.com", url("https://github.com/justcoon"))
     ),
-    zioVersion         := "2.1.9",
+    zioVersion         := "2.1.11",
     scala213           := "2.13.14"
   )
 )