diff --git a/.git-blame-ignore-revs b/.git-blame-ignore-revs
new file mode 100644
index 0000000..dab64f2
--- /dev/null
+++ b/.git-blame-ignore-revs
@@ -0,0 +1,2 @@
+# Scala Steward: Reformat with scalafmt 3.8.3
+5cde0aed9209ba4f4d81bc19f2af65744d16811f
diff --git a/.scalafmt.conf b/.scalafmt.conf
index d2becd8..8f5b0f6 100644
--- a/.scalafmt.conf
+++ b/.scalafmt.conf
@@ -1,4 +1,4 @@
-version = 3.8.1
+version = 3.8.3
 runner.dialect = scala213source3
 project.git = true
 maxColumn = 120
diff --git a/itest/src/custom-rule/build.sc b/itest/src/custom-rule/build.sc
index dd94346..d78a7c7 100644
--- a/itest/src/custom-rule/build.sc
+++ b/itest/src/custom-rule/build.sc
@@ -5,8 +5,9 @@ import mill.scalalib._
 import os._
 
 object project extends ScalaModule with ScalafixModule {
-  def scalaVersion    = "2.12.17"
-  def semanticDbEnablePluginScalacOptions = super.semanticDbEnablePluginScalacOptions() ++ Seq("-P:semanticdb:synthetics:on")
+  def scalaVersion = "2.12.17"
+  def semanticDbEnablePluginScalacOptions =
+    super.semanticDbEnablePluginScalacOptions() ++ Seq("-P:semanticdb:synthetics:on")
   def scalafixIvyDeps = Agg(ivy"org.scala-lang.modules::scala-collection-migrations:2.12.0")
 }
 
diff --git a/itest/src/custom-rule/project/src/Fix.scala b/itest/src/custom-rule/project/src/Fix.scala
index bd4ec6f..89dc5ba 100644
--- a/itest/src/custom-rule/project/src/Fix.scala
+++ b/itest/src/custom-rule/project/src/Fix.scala
@@ -3,8 +3,8 @@ object Tuple2ZippedSrc213 {
   def zipped(xs: List[Int], ys: List[Int]): Unit = {
     (xs, ys).zipped
     (xs, ys).zipped
-    ((xs, ys) zipped)
-    ((xs, ys).zipped)
+    (xs, ys).zipped
+    (xs, ys).zipped
     (xs, ys).zipped
     /* a */
     ( /* b */ xs /* c */, /* d */ ys /* e */ ) /* f */ . /* g */ zipped /* h */
diff --git a/itest/src/fix-2.12/build.sc b/itest/src/fix-2.12/build.sc
index 21dd5f5..a26e953 100644
--- a/itest/src/fix-2.12/build.sc
+++ b/itest/src/fix-2.12/build.sc
@@ -7,7 +7,7 @@ import os._
 object project extends ScalaModule with ScalafixModule {
   def scalaVersion  = "2.12.17"
   def scalacOptions = Seq("-Ywarn-unused")
-  def ivyDeps = Agg(ivy"org.scala-lang.modules::scala-collection-compat:2.12.0")
+  def ivyDeps       = Agg(ivy"org.scala-lang.modules::scala-collection-compat:2.12.0")
 }
 
 def verify() =
diff --git a/itest/src/fix-3.5/build.sc b/itest/src/fix-3.5/build.sc
index 1902c8e..283a68d 100644
--- a/itest/src/fix-3.5/build.sc
+++ b/itest/src/fix-3.5/build.sc
@@ -11,11 +11,12 @@ object project extends ScalaModule with ScalafixModule {
 def verify() =
   T.command {
     val fixedScala = read(pwd / "project" / "src" / "Fix.scala")
-    val expected = """object Fix {
-                     |  // use a 3.5.x-only feature to fail if a Scala 3 LTS compiler is used 
-                     |  // https://www.scala-lang.org/blog/2024/08/22/scala-3.5.0-released.html#support-for-binary-integer-literals 
-                     |  def myComplexMethod: Map[Int, String] = 1.to(0B1010).map(i => i -> i.toString).toMap
-                     |}
-                     |""".stripMargin
+    val expected =
+      """object Fix {
+        |  // use a 3.5.x-only feature to fail if a Scala 3 LTS compiler is used
+        |  // https://www.scala-lang.org/blog/2024/08/22/scala-3.5.0-released.html#support-for-binary-integer-literals
+        |  def myComplexMethod: Map[Int, String] = 1.to(0B1010).map(i => i -> i.toString).toMap
+        |}
+        |""".stripMargin
     assert(fixedScala == expected)
   }
diff --git a/itest/src/fix-3.5/project/src/Fix.scala b/itest/src/fix-3.5/project/src/Fix.scala
index 015479f..26c845c 100644
--- a/itest/src/fix-3.5/project/src/Fix.scala
+++ b/itest/src/fix-3.5/project/src/Fix.scala
@@ -1,5 +1,5 @@
 object Fix {
-  // use a 3.5.x-only feature to fail if a Scala 3 LTS compiler is used 
-  // https://www.scala-lang.org/blog/2024/08/22/scala-3.5.0-released.html#support-for-binary-integer-literals 
+  // use a 3.5.x-only feature to fail if a Scala 3 LTS compiler is used
+  // https://www.scala-lang.org/blog/2024/08/22/scala-3.5.0-released.html#support-for-binary-integer-literals
   def myComplexMethod = 1.to(0B1010).map(i => i -> i.toString).toMap
 }
diff --git a/itest/src/fix/build.sc b/itest/src/fix/build.sc
index e64d549..6ba1fb3 100644
--- a/itest/src/fix/build.sc
+++ b/itest/src/fix/build.sc
@@ -5,9 +5,9 @@ import mill.scalalib._
 import os._
 
 object project extends ScalaModule with ScalafixModule {
-  def scalaVersion  = "2.13.12"
+  def scalaVersion               = "2.13.12"
   def scalafixScalaBinaryVersion = mill.scalalib.api.ZincWorkerUtil.scalaBinaryVersion(scalaVersion())
-  def scalacOptions = Seq("-Ywarn-unused")
+  def scalacOptions              = Seq("-Ywarn-unused")
 }
 
 def verify() =