diff --git a/build.sbt b/build.sbt
index ad51543..620848a 100644
--- a/build.sbt
+++ b/build.sbt
@@ -1,7 +1,7 @@
 import com.typesafe.tools.mima.core._
 
 val Scala213 = "2.13.18"
-val Scala3 = "3.3.8"
+val Scala3 = "3.3.9"
 
 ThisBuild / tlBaseVersion := "0.4"
 ThisBuild / crossScalaVersions := Seq("2.12.21", Scala213, Scala3)
diff --git a/core/src/test/scala/org/typelevel/keypool/KeyPoolSpec.scala b/core/src/test/scala/org/typelevel/keypool/KeyPoolSpec.scala
index 4175ec5..59b9335 100644
--- a/core/src/test/scala/org/typelevel/keypool/KeyPoolSpec.scala
+++ b/core/src/test/scala/org/typelevel/keypool/KeyPoolSpec.scala
@@ -185,7 +185,7 @@ class KeyPoolSpec extends CatsEffectSuite {
       )
       .withDefaultReuseState(Reusable.Reuse)
       .withIdleTimeAllowedInPool(5.seconds)
-      .withDurationBetweenEvictionRuns(-1.seconds)
+      .withDurationBetweenEvictionRuns((-1).seconds)
       .withMaxPerKey(Function.const(1))
       .withMaxTotal(1)
       .withOnReaperException((_: Throwable) => IO.unit)
diff --git a/core/src/test/scala/org/typelevel/keypool/PoolSpec.scala b/core/src/test/scala/org/typelevel/keypool/PoolSpec.scala
index e81367d..8b2e89a 100644
--- a/core/src/test/scala/org/typelevel/keypool/PoolSpec.scala
+++ b/core/src/test/scala/org/typelevel/keypool/PoolSpec.scala
@@ -168,7 +168,7 @@ class PoolSpec extends CatsEffectSuite {
       )
       .withDefaultReuseState(Reusable.Reuse)
       .withIdleTimeAllowedInPool(5.seconds)
-      .withDurationBetweenEvictionRuns(-1.seconds)
+      .withDurationBetweenEvictionRuns((-1).seconds)
       .withMaxTotal(1)
       .withOnReaperException((_: Throwable) => IO.unit)
       .build