diff --git a/build.sbt b/build.sbt
index a24b3020..2f7ccce7 100644
--- a/build.sbt
+++ b/build.sbt
@@ -1,6 +1,6 @@
 import com.github.sbt.git.SbtGit.GitKeys._
 
-val scala212 = "2.12.20"
+val scala212 = "2.12.21"
 val scala213 = "2.13.16"
 val scala3 = "3.3.7"
 val updateReadme = inputKey[Unit]("Update readme")