diff --git a/.git-blame-ignore-revs b/.git-blame-ignore-revs
index fc885d5..8549458 100644
--- a/.git-blame-ignore-revs
+++ b/.git-blame-ignore-revs
@@ -12,3 +12,6 @@ cc4f48597d3151542ecec3c159159e1793926314
 
 # Scala Steward: Reformat with scalafmt 3.8.2
 60f546bd54981b54826a07f290b287cd105d6a9a
+
+# Scala Steward: Reformat with scalafmt 3.9.10
+150b63917599ee04272be6fa22f8747380f952ab
diff --git a/.scalafmt.conf b/.scalafmt.conf
index 4e1e4d9..f4b5250 100644
--- a/.scalafmt.conf
+++ b/.scalafmt.conf
@@ -1,5 +1,5 @@
 runner.dialect = scala213
-version = 3.9.4
+version = 3.9.10
 maxColumn = 120
 fileOverride {
   "glob:**/scala-3/**" {
diff --git a/core/src/main/scala/sttp/model/UriInterpolator.scala b/core/src/main/scala/sttp/model/UriInterpolator.scala
index 98a9906..5809675 100644
--- a/core/src/main/scala/sttp/model/UriInterpolator.scala
+++ b/core/src/main/scala/sttp/model/UriInterpolator.scala
@@ -465,7 +465,7 @@ object UriInterpolator {
     case object Scheme extends UriBuilder {
       override def fromTokens(u: Uri, t: ArrayView[Token]): (Uri, ArrayView[Token]) = {
         split(t, SchemeEnd) match {
-          case Left(_) => (u, t)
+          case Left(_)                               => (u, t)
           case Right((schemeTokens, _, otherTokens)) =>
             val scheme = tokensToString(schemeTokens)
             (u.scheme(scheme), otherTokens)
@@ -476,7 +476,7 @@ object UriInterpolator {
     case object UserInfo extends UriBuilder {
       override def fromTokens(u: Uri, t: ArrayView[Token]): (Uri, ArrayView[Token]) = {
         split(t, AtInAuthority) match {
-          case Left(tt) => (u, tt)
+          case Left(tt)                          => (u, tt)
           case Right((uiTokens, _, otherTokens)) =>
             (uiFromTokens(u, uiTokens), otherTokens)
         }
@@ -488,7 +488,7 @@ object UriInterpolator {
           case x              => x
         }
         split(uiTokensWithDots, ColonInAuthority) match {
-          case Left(tt) => uiFromTokens(u, tt, ArrayView.empty)
+          case Left(tt)                                   => uiFromTokens(u, tt, ArrayView.empty)
           case Right((usernameTokens, _, passwordTokens)) =>
             uiFromTokens(u, usernameTokens, passwordTokens)
         }
@@ -546,7 +546,7 @@ object UriInterpolator {
         }
 
         split(hpTokens, ColonInAuthority) match {
-          case Left(tt) => hostFromTokens(u, tt)
+          case Left(tt)                           => hostFromTokens(u, tt)
           case Right((hostTokens, _, portTokens)) =>
             portFromTokens(hostFromTokens(u, hostTokens), portTokens)
         }
@@ -640,7 +640,7 @@ object UriInterpolator {
             seqToQueryFragments(e)
           case Left(Singleton(ExpressionToken(mqp: QueryParams))) =>
             QF.fromQueryParams(mqp).toVector
-          case Left(t) => tokensToStringOpt(t, decodePlusAsSpace = true).map(QF.Value(_)).toVector
+          case Left(t)                     => tokensToStringOpt(t, decodePlusAsSpace = true).map(QF.Value(_)).toVector
           case Right((leftEq, _, rightEq)) =>
             tokensToStringOpt(leftEq, decodePlusAsSpace = true) match {
               case Some(k) =>
@@ -799,7 +799,7 @@ object UriInterpolator {
       def doSplit(vv: ArrayView[T]): Unit = {
         vv.indexOf(sep) match {
           case -1 => b += vv
-          case i => {
+          case i  => {
             b += vv.take(i)
             doSplit(vv.drop(i + 1))
           }
diff --git a/core/src/main/scala/sttp/model/headers/AcceptEncoding.scala b/core/src/main/scala/sttp/model/headers/AcceptEncoding.scala
index 44c4f91..a69274e 100644
--- a/core/src/main/scala/sttp/model/headers/AcceptEncoding.scala
+++ b/core/src/main/scala/sttp/model/headers/AcceptEncoding.scala
@@ -21,7 +21,7 @@ object AcceptEncoding {
     else {
       @tailrec
       def go(es: List[WeightedEncoding], validated: List[WeightedEncoding]): Either[String, AcceptEncoding] = es match {
-        case Nil => Right(AcceptEncoding(validated.reverse))
+        case Nil          => Right(AcceptEncoding(validated.reverse))
         case head :: tail =>
           validate(head, str) match {
             case Left(s)  => Left(s)
@@ -38,7 +38,7 @@ object AcceptEncoding {
 
   private def parsSingleEncoding(s: String): WeightedEncoding =
     s.split(";") match {
-      case Array(algorithm) => WeightedEncoding(algorithm, None)
+      case Array(algorithm)         => WeightedEncoding(algorithm, None)
       case Array(algorithm, weight) =>
         weight.split("=") match {
           case Array(_, value) => WeightedEncoding(algorithm, Some(BigDecimal(value)))
diff --git a/core/src/main/scala/sttp/model/headers/Accepts.scala b/core/src/main/scala/sttp/model/headers/Accepts.scala
index 80dbaa9..83ac565 100644
--- a/core/src/main/scala/sttp/model/headers/Accepts.scala
+++ b/core/src/main/scala/sttp/model/headers/Accepts.scala
@@ -30,7 +30,7 @@ object Accepts {
       case (Nil, Nil)            => AnyRange :: Nil
       case (Nil, (ch, _) :: Nil) => ContentTypeRange(Wildcard, Wildcard, ch, EmptyParameters) :: Nil
       case ((mt, _) :: Nil, Nil) => ContentTypeRange(mt.mainType, mt.subType, Wildcard, mt.otherParameters) :: Nil
-      case (Nil, chs) =>
+      case (Nil, chs)            =>
         chs.sortBy({ case (_, q) => -q }).map { case (ch, _) =>
           ContentTypeRange(Wildcard, Wildcard, ch, EmptyParameters)
         }
@@ -44,7 +44,7 @@ object Accepts {
           chs.map { case (ch, chQ) => (mt, ch) -> math.min(mtQ, chQ) }
         } match {
           case ((mt, ch), _) :: Nil => ContentTypeRange(mt.mainType, mt.subType, ch, mt.otherParameters) :: Nil
-          case merged =>
+          case merged               =>
             merged.sortBy({ case (_, q) => -q }).map { case ((mt, ch), _) =>
               ContentTypeRange(mt.mainType, mt.subType, ch, mt.otherParameters)
             }
@@ -74,7 +74,7 @@ object Accepts {
     val chs = List.newBuilder[(String, Float)]
     extractEntries(headers, HeaderNames.AcceptCharset).foreach { entry =>
       parseAcceptCharsetEntry(entry) match {
-        case Right(ch) => chs += ch
+        case Right(ch)   => chs += ch
         case Left(error) =>
           if (errors.length != 0) errors.append('\n')
           else ()
@@ -115,7 +115,7 @@ object Accepts {
 
   private def qValueFrom(parameters: Map[String, String]): Either[String, Float] =
     parameters.get("q") match {
-      case None => Right(1f)
+      case None    => Right(1f)
       case Some(q) =>
         val qValue = Patterns.QValue.matcher(q)
         if (qValue.matches() && qValue.groupCount() == 1) Right(qValue.group(1).toFloat)
diff --git a/core/src/main/scala/sttp/model/headers/CacheDirective.scala b/core/src/main/scala/sttp/model/headers/CacheDirective.scala
index 9ec906b..571cfc5 100644
--- a/core/src/main/scala/sttp/model/headers/CacheDirective.scala
+++ b/core/src/main/scala/sttp/model/headers/CacheDirective.scala
@@ -53,9 +53,9 @@ object CacheDirective {
       case "public"           => Right(Public)
       case "private"          => Right(Private)
       case "proxy-revalidate" => Right(ProxyRevalidate)
-      case SMaxagePattern(c) =>
+      case SMaxagePattern(c)  =>
         ParseUtils.toIntOption(c).map(s => SMaxage(s.seconds)).toRight("Unable to parse string: %s".format(c))
-      case "immutable" => Right(Immutable)
+      case "immutable"                    => Right(Immutable)
       case StaleWhileRevalidatePattern(c) =>
         ParseUtils
           .toIntOption(c)
diff --git a/core/src/main/scala/sttp/model/headers/ContentRange.scala b/core/src/main/scala/sttp/model/headers/ContentRange.scala
index 2605005..1926f30 100644
--- a/core/src/main/scala/sttp/model/headers/ContentRange.scala
+++ b/core/src/main/scala/sttp/model/headers/ContentRange.scala
@@ -34,7 +34,7 @@ object ContentRange {
 
   private def processString(unit: String, possibleRange: String, possibleSize: String): Either[String, ContentRange] = {
     val range = possibleRange.split("-") match {
-      case Array("*") => Right(None)
+      case Array("*")  => Right(None)
       case Array(s, e) =>
         for {
           start <- ParseUtils.toLongOption(s).toRight(s"Invalid start of range: $s")
diff --git a/core/src/main/scala/sttp/model/headers/Cookie.scala b/core/src/main/scala/sttp/model/headers/Cookie.scala
index 0b2182c..e446e6f 100644
--- a/core/src/main/scala/sttp/model/headers/Cookie.scala
+++ b/core/src/main/scala/sttp/model/headers/Cookie.scala
@@ -278,10 +278,10 @@ object CookieWithMeta {
           case Success(maxAge) => result = result.map(_.maxAge(Some(maxAge)))
           case Failure(_)      => result = Left(s"Max-Age cookie directive is not a number: $v")
         }
-      case (ci"domain", v)   => result = result.map(_.domain(Some(v.getOrElse(""))))
-      case (ci"path", v)     => result = result.map(_.path(Some(v.getOrElse(""))))
-      case (ci"secure", _)   => result = result.map(_.secure(true))
-      case (ci"httponly", _) => result = result.map(_.httpOnly(true))
+      case (ci"domain", v)         => result = result.map(_.domain(Some(v.getOrElse(""))))
+      case (ci"path", v)           => result = result.map(_.path(Some(v.getOrElse(""))))
+      case (ci"secure", _)         => result = result.map(_.secure(true))
+      case (ci"httponly", _)       => result = result.map(_.httpOnly(true))
       case (ci"samesite", Some(v)) =>
         v.trim match {
           case ci"lax"    => result = result.map(_.sameSite(Some(SameSite.Lax)))
diff --git a/core/src/main/scala/sttp/model/headers/Range.scala b/core/src/main/scala/sttp/model/headers/Range.scala
index cc5abf2..4592a8b 100644
--- a/core/src/main/scala/sttp/model/headers/Range.scala
+++ b/core/src/main/scala/sttp/model/headers/Range.scala
@@ -60,7 +60,7 @@ object Range {
     @tailrec
     def run(raw: List[String], acc: List[Range]): Either[String, List[Range]] = {
       raw match {
-        case Nil => Right(acc.reverse)
+        case Nil          => Right(acc.reverse)
         case head :: tail =>
           parseSingleRange(head, unit) match {
             case Right(r) => run(tail, r :: acc)
diff --git a/core/src/main/scala/sttp/model/internal/Validate.scala b/core/src/main/scala/sttp/model/internal/Validate.scala
index 23d65e3..fb4fc42 100644
--- a/core/src/main/scala/sttp/model/internal/Validate.scala
+++ b/core/src/main/scala/sttp/model/internal/Validate.scala
@@ -13,7 +13,7 @@ object Validate {
       e
     } match {
       case Some(e) => Left(e)
-      case None =>
+      case None    =>
         Right(results.collect { case Right(c) =>
           c
         })