diff --git a/build.sbt b/build.sbt
index 1406394..66b0f8f 100644
--- a/build.sbt
+++ b/build.sbt
@@ -1,7 +1,7 @@
 import scala.collection.immutable
 
 lazy val V = new {
-  val SCALA_2_12 = "2.12.20"
+  val SCALA_2_12 = "2.12.21"
   val SCALA_2_13 = "2.13.17"
   val SCALA_3 = "3.3.7"
   val Scalas = Seq(SCALA_2_13, SCALA_2_12, SCALA_3)