diff --git a/build.sbt b/build.sbt
index c22ab4ae..923c1c19 100644
--- a/build.sbt
+++ b/build.sbt
@@ -51,7 +51,7 @@ ThisBuild / mergifyStewardConfig ~= {
   }
 }
 
-val Scala212 = "2.12.20"
+val Scala212 = "2.12.21"
 val Scala213 = "2.13.17"
 val Scala3 = "3.3.7"
 ThisBuild / crossScalaVersions := Seq(Scala212, Scala3, Scala213)