diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a8136c35..4a9a1f85 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -22,9 +22,9 @@ jobs:
             { version: '2.12.17' },
             { version: '2.12.16' },
             { version: '2.12.15' },
+            { version: '2.13.9' },
             { version: '2.13.8' },
             { version: '2.13.7' },
-            { version: '2.13.6' },
           ]
     steps:
       - name: checkout the repo
diff --git a/bin/test-release.sh b/bin/test-release.sh
index f0462692..7abd3bcc 100755
--- a/bin/test-release.sh
+++ b/bin/test-release.sh
@@ -23,6 +23,8 @@ coursier fetch \
   org.scoverage:scalac-scoverage-plugin_2.13.5:$version \
   org.scoverage:scalac-scoverage-plugin_2.13.6:$version \
   org.scoverage:scalac-scoverage-plugin_2.13.7:$version \
+  org.scoverage:scalac-scoverage-plugin_2.13.8:$version \
+  org.scoverage:scalac-scoverage-plugin_2.13.9:$version \
   org.scoverage:scalac-scoverage-runtime_2.12:$version \
   org.scoverage:scalac-scoverage-runtime_2.13:$version \
   org.scoverage:scalac-scoverage-runtime_sjs1_2.12:$version \
diff --git a/build.sbt b/build.sbt
index a935d651..6c7505ba 100644
--- a/build.sbt
+++ b/build.sbt
@@ -4,7 +4,7 @@ import sbtcrossproject.CrossType
 lazy val munitVersion = "0.7.29"
 lazy val scalametaVersion = "4.5.13"
 lazy val defaultScala212 = "2.12.17"
-lazy val defaultScala213 = "2.13.8"
+lazy val defaultScala213 = "2.13.9"
 lazy val defaultScala3 = "3.1.3"
 lazy val bin212 =
   Seq(
@@ -22,6 +22,7 @@ lazy val bin212 =
 lazy val bin213 =
   Seq(
     defaultScala213,
+    "2.13.8",
     "2.13.7",
     "2.13.6",
     "2.13.5",