diff --git a/build.sbt b/build.sbt
index ef66bc5..b3078d6 100644
--- a/build.sbt
+++ b/build.sbt
@@ -57,7 +57,7 @@ ThisBuild / githubWorkflowBuildPostamble ++= Seq(
 
 val smithyVersion = "1.73.0"
 val alloyVersion = "0.3.40"
-val smithy4sVersion = "0.19.8"
+val smithy4sVersion = "0.19.12"
 val smithy4sNdjsonVersion = "0.3.1"
 
 val commonSettings = Seq(