diff --git a/.git-blame-ignore-revs b/.git-blame-ignore-revs
new file mode 100644
index 0000000..393ef18
--- /dev/null
+++ b/.git-blame-ignore-revs
@@ -0,0 +1,2 @@
+# Scala Steward: Reformat with scalafmt 3.9.8
+c607e1e9bd721f01470c717fabc76607c3108aef
diff --git a/.scalafmt.conf b/.scalafmt.conf
index c8194bb..e9db51a 100644
--- a/.scalafmt.conf
+++ b/.scalafmt.conf
@@ -1,4 +1,4 @@
-version = 3.9.4
+version = 3.9.8
 
 style = defaultWithAlign
 
diff --git a/plugin/src/sbt-test/sbt-java-formatter/aosp-style/project/plugins.sbt b/plugin/src/sbt-test/sbt-java-formatter/aosp-style/project/plugins.sbt
index 7ef9c15..6e37f4a 100644
--- a/plugin/src/sbt-test/sbt-java-formatter/aosp-style/project/plugins.sbt
+++ b/plugin/src/sbt-test/sbt-java-formatter/aosp-style/project/plugins.sbt
@@ -1 +1 @@
-addSbtPlugin("com.github.sbt"  % "sbt-java-formatter" % System.getProperty("plugin.version"))
+addSbtPlugin("com.github.sbt" % "sbt-java-formatter" % System.getProperty("plugin.version"))
diff --git a/plugin/src/sbt-test/sbt-java-formatter/default/project/plugins.sbt b/plugin/src/sbt-test/sbt-java-formatter/default/project/plugins.sbt
index 7ef9c15..6e37f4a 100644
--- a/plugin/src/sbt-test/sbt-java-formatter/default/project/plugins.sbt
+++ b/plugin/src/sbt-test/sbt-java-formatter/default/project/plugins.sbt
@@ -1 +1 @@
-addSbtPlugin("com.github.sbt"  % "sbt-java-formatter" % System.getProperty("plugin.version"))
+addSbtPlugin("com.github.sbt" % "sbt-java-formatter" % System.getProperty("plugin.version"))
diff --git a/plugin/src/sbt-test/sbt-java-formatter/multi-module-crawl-up-for-file/build.sbt b/plugin/src/sbt-test/sbt-java-formatter/multi-module-crawl-up-for-file/build.sbt
index 8519820..b705fe8 100644
--- a/plugin/src/sbt-test/sbt-java-formatter/multi-module-crawl-up-for-file/build.sbt
+++ b/plugin/src/sbt-test/sbt-java-formatter/multi-module-crawl-up-for-file/build.sbt
@@ -1,12 +1,9 @@
 lazy val sbtJavaFormatter = project
   .in(file("."))
   .aggregate(inner)
-  .settings(
-    TaskKey[Unit]("removeFile") := {
-      val actualPath = (inner / Compile / javaSource).value / "com" / "lightbend" / "GoodFormatting.java"
-      java.nio.file.Files.delete(actualPath.toPath)
-    }
-  )
+  .settings(TaskKey[Unit]("removeFile") := {
+    val actualPath = (inner / Compile / javaSource).value / "com" / "lightbend" / "GoodFormatting.java"
+    java.nio.file.Files.delete(actualPath.toPath)
+  })
 
-lazy val inner = project
-  .in(file("inner"))
+lazy val inner = project.in(file("inner"))
diff --git a/plugin/src/sbt-test/sbt-java-formatter/multi-module-crawl-up-for-file/project/plugins.sbt b/plugin/src/sbt-test/sbt-java-formatter/multi-module-crawl-up-for-file/project/plugins.sbt
index 7ef9c15..6e37f4a 100644
--- a/plugin/src/sbt-test/sbt-java-formatter/multi-module-crawl-up-for-file/project/plugins.sbt
+++ b/plugin/src/sbt-test/sbt-java-formatter/multi-module-crawl-up-for-file/project/plugins.sbt
@@ -1 +1 @@
-addSbtPlugin("com.github.sbt"  % "sbt-java-formatter" % System.getProperty("plugin.version"))
+addSbtPlugin("com.github.sbt" % "sbt-java-formatter" % System.getProperty("plugin.version"))
diff --git a/plugin/src/sbt-test/sbt-java-formatter/on-compile-false/project/plugins.sbt b/plugin/src/sbt-test/sbt-java-formatter/on-compile-false/project/plugins.sbt
index 7ef9c15..6e37f4a 100644
--- a/plugin/src/sbt-test/sbt-java-formatter/on-compile-false/project/plugins.sbt
+++ b/plugin/src/sbt-test/sbt-java-formatter/on-compile-false/project/plugins.sbt
@@ -1 +1 @@
-addSbtPlugin("com.github.sbt"  % "sbt-java-formatter" % System.getProperty("plugin.version"))
+addSbtPlugin("com.github.sbt" % "sbt-java-formatter" % System.getProperty("plugin.version"))
diff --git a/plugin/src/sbt-test/sbt-java-formatter/on-compile-true/project/plugins.sbt b/plugin/src/sbt-test/sbt-java-formatter/on-compile-true/project/plugins.sbt
index 7ef9c15..6e37f4a 100644
--- a/plugin/src/sbt-test/sbt-java-formatter/on-compile-true/project/plugins.sbt
+++ b/plugin/src/sbt-test/sbt-java-formatter/on-compile-true/project/plugins.sbt
@@ -1 +1 @@
-addSbtPlugin("com.github.sbt"  % "sbt-java-formatter" % System.getProperty("plugin.version"))
+addSbtPlugin("com.github.sbt" % "sbt-java-formatter" % System.getProperty("plugin.version"))