diff --git a/build.sbt b/build.sbt
index 9785e28a..554afcbc 100644
--- a/build.sbt
+++ b/build.sbt
@@ -123,7 +123,7 @@ ThisBuild / githubWorkflowEnv ++= List(
 
 lazy val scala3 = "3.1.3"
 lazy val scala2_13 = "2.13.8"
-lazy val scala2_12 = "2.12.16"
+lazy val scala2_12 = "2.12.21"
 
 lazy val scala2Only = Seq(scala2_12, scala2_13)
 lazy val scala2And3 = scala2Only :+ scala3