diff --git a/build.sbt b/build.sbt
index bb3110b..97f250f 100644
--- a/build.sbt
+++ b/build.sbt
@@ -29,7 +29,7 @@ val fs2V = "3.7.0"
 val http4sV = "0.23.19"
 val fiberLocalV = "0.1.2"
 val natchezV = "0.3.2"
-val munitCatsEffectV = "2.0.0-M3"
+val munitCatsEffectV = "2.0.0-M4"
 
 val slf4jV    = "1.7.30"