diff --git a/build.sbt b/build.sbt
index efd6ef3c6..d46282f54 100644
--- a/build.sbt
+++ b/build.sbt
@@ -2,7 +2,7 @@ import FreeGen2._
 import scala.sys.process._
 
 // Library versions all in one place, for convenience and sanity.
-lazy val catsVersion = "2.10.0"
+lazy val catsVersion = "2.12.0"
 lazy val catsEffectVersion = "3.5.4"
 lazy val circeVersion = "0.14.7"
 lazy val fs2Version = "3.10.2"