diff --git a/build.sbt b/build.sbt
index acccec421..351371cb7 100644
--- a/build.sbt
+++ b/build.sbt
@@ -18,7 +18,7 @@ val vulcanVersion = "1.12.0"
 
 val munitVersion = "0.7.29"
 
-val scala212 = "2.12.20"
+val scala212 = "2.12.21"
 
 val scala213 = "2.13.17"