diff --git a/build.sbt b/build.sbt
index 141bc10..4c22fac 100644
--- a/build.sbt
+++ b/build.sbt
@@ -1,6 +1,6 @@
 import scala.sys.process._
 
-val scalaVersions = Seq("3.5.1", "2.13.14", "2.12.20", "2.11.12")
+val scalaVersions = Seq("3.5.1", "2.13.15", "2.12.20", "2.11.12")
 val macrosParadiseVersion = "2.1.1"
 
 ThisBuild / versionScheme := Some("semver-spec")
diff --git a/plugin/src/sbt-test/sbt-jni/overloads/project/ScriptedHelper.scala b/plugin/src/sbt-test/sbt-jni/overloads/project/ScriptedHelper.scala
index 9d8970d..34ffae4 100644
--- a/plugin/src/sbt-test/sbt-jni/overloads/project/ScriptedHelper.scala
+++ b/plugin/src/sbt-test/sbt-jni/overloads/project/ScriptedHelper.scala
@@ -8,7 +8,7 @@ object ScriptedHelper extends AutoPlugin {
 
   override def projectSettings = Seq(
     scalacOptions ++= Seq("-feature", "-deprecation"),
-    crossScalaVersions := Seq("2.13.14", "2.12.20"),
+    crossScalaVersions := Seq("2.13.15", "2.12.20"),
     scalaVersion := crossScalaVersions.value.head
   )
 
diff --git a/plugin/src/sbt-test/sbt-jni/simple-cargo/project/ScriptedHelper.scala b/plugin/src/sbt-test/sbt-jni/simple-cargo/project/ScriptedHelper.scala
index 9d8970d..34ffae4 100644
--- a/plugin/src/sbt-test/sbt-jni/simple-cargo/project/ScriptedHelper.scala
+++ b/plugin/src/sbt-test/sbt-jni/simple-cargo/project/ScriptedHelper.scala
@@ -8,7 +8,7 @@ object ScriptedHelper extends AutoPlugin {
 
   override def projectSettings = Seq(
     scalacOptions ++= Seq("-feature", "-deprecation"),
-    crossScalaVersions := Seq("2.13.14", "2.12.20"),
+    crossScalaVersions := Seq("2.13.15", "2.12.20"),
     scalaVersion := crossScalaVersions.value.head
   )
 
diff --git a/plugin/src/sbt-test/sbt-jni/simple-meson/project/ScriptedHelper.scala b/plugin/src/sbt-test/sbt-jni/simple-meson/project/ScriptedHelper.scala
index 9d8970d..34ffae4 100644
--- a/plugin/src/sbt-test/sbt-jni/simple-meson/project/ScriptedHelper.scala
+++ b/plugin/src/sbt-test/sbt-jni/simple-meson/project/ScriptedHelper.scala
@@ -8,7 +8,7 @@ object ScriptedHelper extends AutoPlugin {
 
   override def projectSettings = Seq(
     scalacOptions ++= Seq("-feature", "-deprecation"),
-    crossScalaVersions := Seq("2.13.14", "2.12.20"),
+    crossScalaVersions := Seq("2.13.15", "2.12.20"),
     scalaVersion := crossScalaVersions.value.head
   )
 
diff --git a/plugin/src/sbt-test/sbt-jni/simple-syntax/project/ScriptedHelper.scala b/plugin/src/sbt-test/sbt-jni/simple-syntax/project/ScriptedHelper.scala
index ae99104..d109af2 100644
--- a/plugin/src/sbt-test/sbt-jni/simple-syntax/project/ScriptedHelper.scala
+++ b/plugin/src/sbt-test/sbt-jni/simple-syntax/project/ScriptedHelper.scala
@@ -8,7 +8,7 @@ object ScriptedHelper extends AutoPlugin {
 
   override def projectSettings = Seq(
     scalacOptions ++= Seq("-feature", "-deprecation"),
-    crossScalaVersions := Seq("3.5.1", "2.13.14", "2.12.20"),
+    crossScalaVersions := Seq("3.5.1", "2.13.15", "2.12.20"),
     scalaVersion := crossScalaVersions.value.head
   )
 
diff --git a/plugin/src/sbt-test/sbt-jni/simple/project/ScriptedHelper.scala b/plugin/src/sbt-test/sbt-jni/simple/project/ScriptedHelper.scala
index 9d8970d..34ffae4 100644
--- a/plugin/src/sbt-test/sbt-jni/simple/project/ScriptedHelper.scala
+++ b/plugin/src/sbt-test/sbt-jni/simple/project/ScriptedHelper.scala
@@ -8,7 +8,7 @@ object ScriptedHelper extends AutoPlugin {
 
   override def projectSettings = Seq(
     scalacOptions ++= Seq("-feature", "-deprecation"),
-    crossScalaVersions := Seq("2.13.14", "2.12.20"),
+    crossScalaVersions := Seq("2.13.15", "2.12.20"),
     scalaVersion := crossScalaVersions.value.head
   )