diff --git a/build.sbt b/build.sbt
index c3d4a337..daf40573 100644
--- a/build.sbt
+++ b/build.sbt
@@ -32,7 +32,7 @@ val ScalatestVersion = "3.2.19"
 val ScalazVersion = "7.2.36"
 val Slf4jVersion = "2.0.17"
 val SprayJsonVersion = "1.3.6"
-val ZIOVersion = "2.1.18"
+val ZIOVersion = "2.1.21"
 val ZIOInteropCatsVersion = "23.1.0.5"
 
 lazy val commonScalaVersionSettings = Seq(