diff --git a/build.sbt b/build.sbt
index 31a848e..fe41708 100644
--- a/build.sbt
+++ b/build.sbt
@@ -24,7 +24,7 @@ inThisBuild(
   )
 )
 
-val zioVersion = "2.0.4"
+val zioVersion = "2.0.21"
 
 val zcaffeine = (project in file("."))
   .settings(fmtAllAlias)