diff --git a/project/plugins.sbt b/project/plugins.sbt
index e5889ae7..45f68171 100644
--- a/project/plugins.sbt
+++ b/project/plugins.sbt
@@ -3,6 +3,6 @@ addSbtPlugin("com.eed3si9n" % "sbt-unidoc" % "0.4.3")
 addSbtPlugin("com.geirsson" % "sbt-ci-release" % "1.5.7")
 addSbtPlugin("com.typesafe" % "sbt-mima-plugin" % "0.9.0")
 addSbtPlugin("de.heikoseeberger" % "sbt-header" % "5.6.0")
-addSbtPlugin("org.scalameta" % "sbt-mdoc" % "2.2.20")
+addSbtPlugin("org.scalameta" % "sbt-mdoc" % "2.2.21")
 addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.4.2")
 addSbtPlugin("ch.epfl.lamp" % "sbt-dotty" % "0.5.5")