diff --git a/build.sbt b/build.sbt
index 9c47bf5d..cb001fc6 100644
--- a/build.sbt
+++ b/build.sbt
@@ -5,7 +5,7 @@ val scala30Version         = "3.1.1"
 val collectionCompatVersion = "2.6.0"
 
 val catsVersion = "2.7.0"
-val catsEffectVersion = "3.3.8"
+val catsEffectVersion = "3.3.9"
 
 // We do `evictionCheck` in CI and don't sweat the Java deps for now.
 inThisBuild(Seq(