diff --git a/build.sbt b/build.sbt
index 35e1f7a..a764de5 100644
--- a/build.sbt
+++ b/build.sbt
@@ -22,7 +22,7 @@ ThisBuild / Test / javaOptions += "-Dcom.linecorp.armeria.verboseResponses=true
 
 val versions = new {
   val armeria = "1.26.4"
-  val fs2 = "3.9.3"
+  val fs2 = "3.9.4"
   val http4s = "0.23.25"
   val logback = "1.2.13"
   val micrometer = "1.9.2"