diff --git a/build.sbt b/build.sbt
index 3574290f..37637cbe 100644
--- a/build.sbt
+++ b/build.sbt
@@ -9,7 +9,7 @@ val scala30Version = "3.3.4"
 val collectionCompatVersion = "2.11.0"
 
 val catsVersion = "2.11.0"
-val catsEffectVersion = "3.5.5"
+val catsEffectVersion = "3.5.6"
 val fs2Version = "3.11.0"
 
 // Publishing
@@ -297,7 +297,7 @@ lazy val mtl = crossProject(JSPlatform, JVMPlatform, NativePlatform)
       "org.typelevel" %%% "cats-mtl" % "1.4.0",
       "org.typelevel" %%% "cats-mtl-laws" % "1.4.0" % Test,
       "org.typelevel" %%% "discipline-munit" % "2.0.0-M3" % Test,
-      "org.typelevel" %%% "cats-effect-testkit" % "3.5.5" % Test
+      "org.typelevel" %%% "cats-effect-testkit" % "3.5.6" % Test
     )
   )
   .nativeSettings(