diff --git a/build.sbt b/build.sbt
index 03d5538..eb5a434 100644
--- a/build.sbt
+++ b/build.sbt
@@ -17,7 +17,7 @@ addSbtJsEngine("1.3.5")
 
 libraryDependencies ++= Seq(
   "org.webjars.npm" % "uglify-js" % "3.16.3",
-  "io.monix" %% "monix" % "2.3.3"
+  "io.monix" %% "monix" % "3.4.1"
 )
 
 // Customise sbt-dynver's behaviour to make it work with tags which aren't v-prefixed
diff --git a/src/main/scala/com/typesafe/sbt/uglify/SbtUglify.scala b/src/main/scala/com/typesafe/sbt/uglify/SbtUglify.scala
index b1ae705..d5d21b8 100644
--- a/src/main/scala/com/typesafe/sbt/uglify/SbtUglify.scala
+++ b/src/main/scala/com/typesafe/sbt/uglify/SbtUglify.scala
@@ -275,7 +275,7 @@ object SbtUglify extends AutoPlugin {
               parallelism = java.lang.Runtime.getRuntime.availableProcessors
             )
             val result = Await.result(
-              resultObservable.toListL.runAsync(uglifyPool),
+              resultObservable.toListL.runToFuture(uglifyPool),
               Duration.Inf // TODO: really? Do we need to run this whole thing async actually since sbt-web 1.5?
                            // sbt-web 1.5 removed usage of akka internally and is not async anymore, so we might
                            // can get rid of it here too (meaning removing this monix stuff)