diff --git a/build.sbt b/build.sbt
index d36b7c80f..96d082b6c 100644
--- a/build.sbt
+++ b/build.sbt
@@ -6,5 +6,5 @@ lazy val upickleReadme = scalatex.ScalatexReadme(
   url = "https://github.com/lihaoyi/upickle/tree/main",
   source = "Readme"
 ).settings(
-  scalaVersion := "2.12.18"
+  scalaVersion := "2.12.20"
 )
diff --git a/build.sc b/build.sc
index 6dca4a449..b272a96fc 100644
--- a/build.sc
+++ b/build.sc
@@ -14,7 +14,7 @@ import mill.scalanativelib.api.{LTO, ReleaseMode}
 import de.tobiasroeser.mill.vcs.version.VcsVersion
 import com.github.lolgab.mill.mima._
 
-val scala212  = "2.12.18"
+val scala212  = "2.12.20"
 val scala213  = "2.13.11"
 
 val scala3   = "3.4.2"