diff --git a/build.sbt b/build.sbt
index a570decae3..9544ff6787 100644
--- a/build.sbt
+++ b/build.sbt
@@ -72,7 +72,7 @@ val scalafixCoreDep =
   "ch.epfl.scala" %% "scalafix-core" % _root_.scalafix.sbt.BuildInfo.scalafixVersion % ScalafixConfig
 
 val testDependencies = Seq(
-  "org.scalamock" %% "scalamock" % "5.2.0",
+  "org.scalamock" %% "scalamock" % "6.0.0",
   "org.scalatest" %% "scalatest" % "3.2.17",
   "org.scalatestplus" %% "scalacheck-1-14" % "3.2.2.0",
   // テスト用のTestSchedulerを使うため