diff --git a/build.sbt b/build.sbt
index 954faf8..0704f0e 100644
--- a/build.sbt
+++ b/build.sbt
@@ -4,7 +4,7 @@ ThisBuild / description := "Yet another Typesafe Config decoder"
 ThisBuild / developers := List(
   Developer("jonas", "Jonas Fonseca", "jonas.fonseca@gmail.com", url("https://github.com/jonas"))
 )
-val scala212 = "2.12.20"
+val scala212 = "2.12.21"
 val scala213 = "2.13.16"
 val scala3 = "3.3.7"
 ThisBuild / scalaVersion := scala213