diff --git a/build.sbt b/build.sbt
index 9f41ab7..c7ff08d 100644
--- a/build.sbt
+++ b/build.sbt
@@ -27,7 +27,7 @@ libraryDependencies ++= Seq(
   "com.lihaoyi" %% "sourcecode"  % "0.4.2",
   "com.lihaoyi" %% "utest"       % "0.8.4" % Test,
   "org.scalaz"  %% "scalaz-core" % "7.3.8" % Optional,
-  "dev.zio"     %% "zio"         % "1.0.18",
+  "dev.zio"     %% "zio"         % "2.1.13",
   "org.slf4j"    % "slf4j-api"   % "2.0.16"
 )