diff --git a/covariant/build.sbt b/covariant/build.sbt
index 6866a82..7a08497 100644
--- a/covariant/build.sbt
+++ b/covariant/build.sbt
@@ -3,9 +3,9 @@ enablePlugins(Example)
 import scala.meta._
 exampleSuperTypes += init"_root_.org.scalatest.Inside"
 
-libraryDependencies += "org.scalaz" %%% "scalaz-core" % "7.4.0-M12"
+libraryDependencies += "org.scalaz" %%% "scalaz-core" % "7.4.0-M13"
 
-libraryDependencies += "org.scalaz" %%% "scalaz-effect" % "7.4.0-M12"
+libraryDependencies += "org.scalaz" %%% "scalaz-effect" % "7.4.0-M13"
 
 libraryDependencies += "org.scalatest" %%% "scalatest" % "3.2.12" % Test
 
diff --git a/invariant/build.sbt b/invariant/build.sbt
index 6866a82..7a08497 100644
--- a/invariant/build.sbt
+++ b/invariant/build.sbt
@@ -3,9 +3,9 @@ enablePlugins(Example)
 import scala.meta._
 exampleSuperTypes += init"_root_.org.scalatest.Inside"
 
-libraryDependencies += "org.scalaz" %%% "scalaz-core" % "7.4.0-M12"
+libraryDependencies += "org.scalaz" %%% "scalaz-core" % "7.4.0-M13"
 
-libraryDependencies += "org.scalaz" %%% "scalaz-effect" % "7.4.0-M12"
+libraryDependencies += "org.scalaz" %%% "scalaz-effect" % "7.4.0-M13"
 
 libraryDependencies += "org.scalatest" %%% "scalatest" % "3.2.12" % Test