diff --git a/build.sbt b/build.sbt
index 99a836a..6f72813 100644
--- a/build.sbt
+++ b/build.sbt
@@ -3,7 +3,7 @@ import com.softwaremill.Publish.ossPublishSettings
 import sbt.Reference.display
 import sbt.internal.ProjectMatrix
 
-val scala2_12 = "2.12.20"
+val scala2_12 = "2.12.21"
 val scala2_13 = "2.13.16"
 val scala3 = "3.3.6"