diff --git a/plugin/src/main/scala/io/github/davidgregory084/ScalaVersion.scala b/plugin/src/main/scala/io/github/davidgregory084/ScalaVersion.scala
index ec91b5a..dabe4ba 100644
--- a/plugin/src/main/scala/io/github/davidgregory084/ScalaVersion.scala
+++ b/plugin/src/main/scala/io/github/davidgregory084/ScalaVersion.scala
@@ -35,6 +35,7 @@ object ScalaVersion {
   val V2_13_4  = ScalaVersion(2, 13, 4)
   val V2_13_5  = ScalaVersion(2, 13, 5)
   val V2_13_6  = ScalaVersion(2, 13, 6)
+  val V2_13_9  = ScalaVersion(2, 13, 9)
   val V3_0_0   = ScalaVersion(3, 0, 0)
   val V3_1_0   = ScalaVersion(3, 1, 0)
 
diff --git a/plugin/src/main/scala/io/github/davidgregory084/ScalacOptions.scala b/plugin/src/main/scala/io/github/davidgregory084/ScalacOptions.scala
index a1a7d4d..82df117 100644
--- a/plugin/src/main/scala/io/github/davidgregory084/ScalacOptions.scala
+++ b/plugin/src/main/scala/io/github/davidgregory084/ScalacOptions.scala
@@ -566,6 +566,11 @@ private[davidgregory084] trait ScalacOptions {
   val warnValueDiscard =
     warnOption("value-discard", version => version.isBetween(V2_13_0, V3_0_0))
 
+  /** Warn when and expression is ignored because it is followed by another expression.
+    */
+  val warnNonUnitStatement = 
+    warnOption("nonunit-statement", version => version.isBetween(V2_13_9, V3_0_0))
+
   /** Fail the compilation if there are any warnings.
     */
   val warnError =
@@ -637,7 +642,8 @@ private[davidgregory084] trait ScalacOptions {
     warnDeadCode,
     warnExtraImplicit,
     warnNumericWiden,
-    warnValueDiscard
+    warnValueDiscard,
+    warnNonUnitStatement
   ) ++ warnUnusedOptions
 
   /** Options which fail the compilation if there are any warnings.