diff --git a/build.sbt b/build.sbt
index 8dc81df..8c6f3a1 100644
--- a/build.sbt
+++ b/build.sbt
@@ -1,4 +1,4 @@
-val Scala212 = "2.12.20"
+val Scala212 = "2.12.21"
 val Scala213 = "2.13.16"
 val Scala3Version = "3.3.4"