diff --git a/build.sbt b/build.sbt
index f6d79bc..89bccea 100644
--- a/build.sbt
+++ b/build.sbt
@@ -19,7 +19,7 @@ ThisBuild / scalaVersion := Scala213
 
 val catsV = "2.9.0"
 val catsEffectV = "3.5.0"
-val fs2V = "3.7.0"
+val fs2V = "3.9.0"
 val http4sV = "0.23.19"
 val munitCatsEffectV = "2.0.0-M3"
 import scalapb.compiler.Version.scalapbVersion