diff --git a/build.sbt b/build.sbt
index bc77d86..37b2472 100644
--- a/build.sbt
+++ b/build.sbt
@@ -32,8 +32,8 @@ lazy val root = project.in(file("."))
         s
       },
       libraryDependencies ++= Seq(
-        "org.scalaz"             %% "scalaz-core"   % "7.2.36",
-        "org.scalaz"             %% "scalaz-effect" % "7.2.36",
+        "org.scalaz"             %% "scalaz-core"   % "7.3.9",
+        "org.scalaz"             %% "scalaz-effect" % "7.3.9",
         "org.scalatest"          %% "scalatest"     % "3.2.20" % "test"
       ),
       homepage := Some(url("https://github.com/sbt/sbt-eclipse")),