diff --git a/build.sbt b/build.sbt
index 9bea3eb1d..47d93f339 100644
--- a/build.sbt
+++ b/build.sbt
@@ -5,7 +5,7 @@ val Scala212 = "2.12.18"
 val Scala213 = "2.13.12"
 val Scala3 = "3.3.1"
 val http4sVersion = "0.23.23"
-val munitCatsEffectVersion = "2.0.0-M3"
+val munitCatsEffectVersion = "2.0.0-M4"
 
 ThisBuild / resolvers +=
   "s01 snapshots".at("https://s01.oss.sonatype.org/content/repositories/snapshots/")