diff --git a/build.sbt b/build.sbt
index b2c0aec..dd2609a 100644
--- a/build.sbt
+++ b/build.sbt
@@ -31,7 +31,7 @@ lazy val `natchez-tagless-root` = tlCrossRootProject.aggregate(
 lazy val doctestSettings: Seq[Def.Setting[?]] = Seq(
   libraryDependencies ++= Seq(
     "org.scalacheck" %%% "scalacheck" % "1.18.0" % Test,
-    "io.monix" %%% "newtypes-core" % "0.2.3" % Test,
+    "io.monix" %%% "newtypes-core" % "0.3.0" % Test,
   ),
   doctestOnlyCodeBlocksMode := true,
   Test / scalacOptions ~= {