diff --git a/project/Dependencies.scala b/project/Dependencies.scala
index 460050b7..bfff44ed 100644
--- a/project/Dependencies.scala
+++ b/project/Dependencies.scala
@@ -7,7 +7,7 @@ object Dependencies {
   val typesafePlay = "com.typesafe.play" %% "play" % playVersion
 
   val scalaVersion       = "2.13.12"
-  val smithy4sVersion    = "0.17.19"
+  val smithy4sVersion    = "0.18.5"
   val smithyCore         = "com.disneystreaming.smithy4s" %% "smithy4s-core"             % smithy4sVersion
   val smithyJson         = "com.disneystreaming.smithy4s" %% "smithy4s-json"             % smithy4sVersion
   val smithy4sCompliance = "com.disneystreaming.smithy4s" %% "smithy4s-compliance-tests" % smithy4sVersion