diff --git a/build.sbt b/build.sbt
index e74ac0f02..d707e30c3 100644
--- a/build.sbt
+++ b/build.sbt
@@ -3,7 +3,7 @@ import Dependencies._
 val Scala213 = "2.13.11"
 val Scala3 = "3.3.1"
 val http4sVersion = "1.0.0-M40"
-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/")