diff --git a/build.sbt b/build.sbt
index 30ff985..39db3c1 100644
--- a/build.sbt
+++ b/build.sbt
@@ -1,5 +1,5 @@
 ThisBuild / tlBaseVersion := "1.6"
-lazy val scala212 = "2.12.20"
+lazy val scala212 = "2.12.21"
 lazy val scala213 = "2.13.18"
 lazy val scala3 = "3.3.7"
 ThisBuild / crossScalaVersions := Seq(scala3, scala213, scala212)