diff --git a/build.sbt b/build.sbt
index de2785dae..ec109dfef 100644
--- a/build.sbt
+++ b/build.sbt
@@ -1,7 +1,7 @@
 import scala.collection.mutable
 
 def scala212 = "2.12.16"
-def scala213 = "2.13.8"
+def scala213 = "2.13.9"
 def scala3 = "3.1.3"
 def scala2Versions = List(scala212, scala213)
 def allScalaVersions = scala2Versions :+ scala3
diff --git a/mdoc-sbt/src/sbt-test/sbt-mdoc/basic/build.sbt b/mdoc-sbt/src/sbt-test/sbt-mdoc/basic/build.sbt
index 71f3a7627..671dfe77f 100644
--- a/mdoc-sbt/src/sbt-test/sbt-mdoc/basic/build.sbt
+++ b/mdoc-sbt/src/sbt-test/sbt-mdoc/basic/build.sbt
@@ -1,5 +1,5 @@
 ThisBuild / scalaVersion := "2.12.16"
-ThisBuild / crossScalaVersions := List("2.12.16", "2.13.8", "3.1.3", "3.2.0", "3.2.1-RC1")
+ThisBuild / crossScalaVersions := List("2.12.16", "2.13.9", "3.1.3", "3.2.0", "3.2.1-RC1")
 
 enablePlugins(MdocPlugin)
 mdocJS := Some(jsapp)
diff --git a/mdoc-sbt/src/sbt-test/sbt-mdoc/scalajs-1.7/build.sbt b/mdoc-sbt/src/sbt-test/sbt-mdoc/scalajs-1.7/build.sbt
index b9c041d41..510a10882 100644
--- a/mdoc-sbt/src/sbt-test/sbt-mdoc/scalajs-1.7/build.sbt
+++ b/mdoc-sbt/src/sbt-test/sbt-mdoc/scalajs-1.7/build.sbt
@@ -1,5 +1,5 @@
 ThisBuild / scalaVersion := "2.12.16"
-ThisBuild / crossScalaVersions := List("2.12.16", "2.13.8", "3.0.1")
+ThisBuild / crossScalaVersions := List("2.12.16", "2.13.9", "3.0.1")
 
 enablePlugins(MdocPlugin)
 mdocJS := Some(jsapp)