diff --git a/.git-blame-ignore-revs b/.git-blame-ignore-revs
index be28ae1..7b9a5f8 100644
--- a/.git-blame-ignore-revs
+++ b/.git-blame-ignore-revs
@@ -3,3 +3,6 @@
 
 # scalafmt
 0ad886c35bdf9c8ad2bfb0501070b8b2ce810710
+
+# Scala Steward: Reformat with scalafmt 3.8.4
+d4918f0dd6a26662c2bcd045ccb28e44031105b0
diff --git a/.scalafmt.conf b/.scalafmt.conf
index 26c5bce..edaebb8 100644
--- a/.scalafmt.conf
+++ b/.scalafmt.conf
@@ -1,4 +1,4 @@
-version = "3.8.1"
+version = "3.8.4"
 
 runner.dialect = scala213
 
diff --git a/build.sbt b/build.sbt
index e5e34c5..e8c49b1 100644
--- a/build.sbt
+++ b/build.sbt
@@ -66,7 +66,7 @@ lazy val render = crossProject(JVMPlatform, JSPlatform)
       val shadeUnder      = "plotly.internals.shaded"
       val shadeNamespaces = Seq("argonaut", "macrocompat", "shapeless")
       for (ns <- shadeNamespaces)
-        yield ShadingRule.moveUnder(ns, shadeUnder),
+        yield ShadingRule.moveUnder(ns, shadeUnder)
     },
     validNamespaces += "plotly",
     libraryDependencies ++= Seq(
diff --git a/render/shared/src/main/scala/plotly/internals/ArgonautCodecsInternals.scala b/render/shared/src/main/scala/plotly/internals/ArgonautCodecsInternals.scala
index af2ebc6..11e1d62 100755
--- a/render/shared/src/main/scala/plotly/internals/ArgonautCodecsInternals.scala
+++ b/render/shared/src/main/scala/plotly/internals/ArgonautCodecsInternals.scala
@@ -36,7 +36,8 @@ object ArgonautCodecsInternals extends ArgonautCodecsExtra {
   ): DecodeJson[W] =
     DecodeJson { c =>
       c.as[T]
-        .map(t => gen.from((t :: HNil).asInstanceOf[L]) // FIXME
+        .map(t =>
+          gen.from((t :: HNil).asInstanceOf[L]) // FIXME
         )
     }