diff --git a/internal/util-complete/src/main/scala/sbt/internal/util/complete/Parser.scala b/internal/util-complete/src/main/scala/sbt/internal/util/complete/Parser.scala
index 0c126584c..88d2543ef 100644
--- a/internal/util-complete/src/main/scala/sbt/internal/util/complete/Parser.scala
+++ b/internal/util-complete/src/main/scala/sbt/internal/util/complete/Parser.scala
@@ -868,7 +868,7 @@ private final class And[T](a: Parser[T], b: Parser[?]) extends ValidParser[T] {
   def derive(c: Char) = a.derive(c) & b.derive(c)
   def completions(level: Int) = a.completions(level).filterS(s => apply(b)(s).resultEmpty.isValid)
   lazy val resultEmpty = a.resultEmpty && b.resultEmpty
-  override def toString = "(%s) && (%s)".format(a, b)
+  override def toString = s"(${a}) && (${b})"
 }
 
 private final class Not(delegate: Parser[?], failMessage: String) extends ValidParser[Unit] {
@@ -881,7 +881,7 @@ private final class Not(delegate: Parser[?], failMessage: String) extends ValidP
     case _: Value[_] => mkFailure(failMessage)
   }
 
-  override def toString = " -(%s)".format(delegate)
+  override def toString = s" -(${delegate})"
 }
 
 /**
diff --git a/lm-ivy/src/main/scala/sbt/internal/librarymanagement/MakePom.scala b/lm-ivy/src/main/scala/sbt/internal/librarymanagement/MakePom.scala
index 71c510feb..dd3383085 100644
--- a/lm-ivy/src/main/scala/sbt/internal/librarymanagement/MakePom.scala
+++ b/lm-ivy/src/main/scala/sbt/internal/librarymanagement/MakePom.scala
@@ -364,8 +364,7 @@ class MakePom(val log: Logger) {
     val (g, a) = (m.getOrganisation, m.getName)
     if (g == null || g.isEmpty || a == null || a.isEmpty)
       Left(
-        "Skipped generating '<exclusion/>' for %s. Dependency exclusion should have both 'org' and 'module' to comply with Maven POM's schema."
-          .format(m)
+        s"Skipped generating '<exclusion/>' for ${m}. Dependency exclusion should have both 'org' and 'module' to comply with Maven POM's schema."
       )
     else
       Right(
diff --git a/main/src/main/scala/sbt/EvaluateTask.scala b/main/src/main/scala/sbt/EvaluateTask.scala
index 110cd7967..8cdf8ce3e 100644
--- a/main/src/main/scala/sbt/EvaluateTask.scala
+++ b/main/src/main/scala/sbt/EvaluateTask.scala
@@ -426,7 +426,7 @@ object EvaluateTask {
     Project.showContextKey(state, if (highlight) Some(RED) else None)
 
   def suppressedMessage(key: ScopedKey[?])(using display: Show[ScopedKey[?]]): String =
-    "Stack trace suppressed.  Run 'last %s' for the full log.".format(display.show(key))
+    s"Stack trace suppressed.  Run 'last ${display.show(key)}' for the full log."
 
   def getStreams(key: ScopedKey[?], streams: Streams): TaskStreams =
     streams(ScopedKey(Project.fillTaskAxis(key).scope, Keys.streams.key))
diff --git a/main/src/main/scala/sbt/Opts.scala b/main/src/main/scala/sbt/Opts.scala
index 9490d6508..3168f2438 100644
--- a/main/src/main/scala/sbt/Opts.scala
+++ b/main/src/main/scala/sbt/Opts.scala
@@ -75,7 +75,7 @@ object DefaultOptions {
   def javac: Seq[String] = compile.encoding("UTF-8")
   def scalac: Seq[String] = compile.encoding("UTF-8")
   def javadoc(name: String, version: String): Seq[String] =
-    Seq("-doctitle", "%s %s API".format(name, version))
+    Seq("-doctitle", s"${name} ${version} API")
   def scaladoc(name: String, version: String): Seq[String] =
     doc.title(name) ++ doc.version(version)
 
@@ -95,11 +95,6 @@ object DefaultOptions {
   def addCredentials: Setting[?] = Keys.credentials += { credentials(Keys.state.value) }
 
   def shellPrompt(version: String): State => String =
-    s =>
-      "%s:%s:%s> ".format(
-        s.configuration.provider.id.name,
-        Project.extract(s).currentProject.id,
-        version
-      )
+    s => s"${s.configuration.provider.id.name}:${Project.extract(s).currentProject.id}:${version}> "
   def setupShellPrompt: Setting[?] = Keys.shellPrompt := { shellPrompt(Keys.version.value) }
 }
diff --git a/main/src/main/scala/sbt/internal/SettingCompletions.scala b/main/src/main/scala/sbt/internal/SettingCompletions.scala
index f19264b17..1cdd7931a 100644
--- a/main/src/main/scala/sbt/internal/SettingCompletions.scala
+++ b/main/src/main/scala/sbt/internal/SettingCompletions.scala
@@ -125,7 +125,7 @@ private[sbt] object SettingCompletions {
       val (used, trimU) = lines(strings(affected))
       val details = if (trimR || trimU) "\n\tRun `last` for details." else ""
       val valuesString = if (redefined.size == 1) "value" else "values"
-      "Defining %s\nThe new %s will be used by %s%s".format(redef, valuesString, used, details)
+      s"Defining ${redef}\nThe new ${valuesString} will be used by ${used}${details}"
     }
   }
 
@@ -170,7 +170,7 @@ private[sbt] object SettingCompletions {
   }
 
   /** Parser for the `in` method name that slightly augments the naive completion to give a hint of the purpose of `in`. */
-  val inParser = tokenDisplay(Space ~> InMethod, "%s <scope>".format(InMethod))
+  val inParser = tokenDisplay(Space ~> InMethod, s"${InMethod} <scope>")
 
   /**
    * Parser for the initialization expression for the assignment method `assign` on the key `sk`.
diff --git a/main/src/main/scala/sbt/internal/SettingGraph.scala b/main/src/main/scala/sbt/internal/SettingGraph.scala
index 1d725a12c..95a803129 100644
--- a/main/src/main/scala/sbt/internal/SettingGraph.scala
+++ b/main/src/main/scala/sbt/internal/SettingGraph.scala
@@ -67,7 +67,7 @@ case class SettingGraph(
   def dependsAscii(defaultWidth: Int): String = Graph.toAscii(
     this,
     (x: SettingGraph) => x.depends.toSeq.sortBy(_.name),
-    (x: SettingGraph) => "%s = %s" format (x.definedIn getOrElse { "" }, x.dataString),
+    (x: SettingGraph) => s"${x.definedIn getOrElse { "" }} = ${x.dataString}",
     defaultWidth
   )
 }
diff --git a/main/src/main/scala/sbt/internal/graph/rendering/DOT.scala b/main/src/main/scala/sbt/internal/graph/rendering/DOT.scala
index e0b3759a7..3c31b61a6 100644
--- a/main/src/main/scala/sbt/internal/graph/rendering/DOT.scala
+++ b/main/src/main/scala/sbt/internal/graph/rendering/DOT.scala
@@ -75,7 +75,7 @@ object DOT:
           if (graph.module(e._1).exists(_.isEvicted))
             s""" [label="Evicted By" style="$EvictedStyle"]"""
           else ""
-        """    "%s" -> "%s"%s""".format(e._1.idString, e._2.idString, extra)
+        s"""    "${e._1.idString}" -> "${e._2.idString}"${extra}"""
       }
     }.sorted.mkString("\n")
 
diff --git a/main/src/main/scala/sbt/plugins/DependencyTreeSettings.scala b/main/src/main/scala/sbt/plugins/DependencyTreeSettings.scala
index 27686d307..89cb957bd 100644
--- a/main/src/main/scala/sbt/plugins/DependencyTreeSettings.scala
+++ b/main/src/main/scala/sbt/plugins/DependencyTreeSettings.scala
@@ -105,7 +105,7 @@ object DependencyTreeSettings {
       // dot support
       dependencyDotFile := {
         val config = configuration.value
-        target.value / "dependencies-%s.dot".format(config.toString)
+        target.value / s"dependencies-${config.toString}.dot"
       },
       dependencyDot / asString := rendering.DOT.dotGraph(
         dependencyTreeModuleGraph0.value,
@@ -123,12 +123,12 @@ object DependencyTreeSettings {
          |    ]""".stripMargin,
       dependencyDotNodeColors := true,
       dependencyDotNodeLabel := { (organization: String, name: String, version: String) =>
-        """%s<BR/><B>%s</B><BR/>%s""".format(organization, name, version)
+        s"""${organization}<BR/><B>${name}</B><BR/>${version}"""
       },
       // GraphML support
       dependencyGraphMLFile := {
         val config = configuration.value
-        target.value / "dependencies-%s.graphml".format(config.toString)
+        target.value / s"dependencies-${config.toString}.graphml"
       },
       dependencyGraphML := dependencyGraphMLTask.value,
       whatDependsOn := {
@@ -188,7 +188,7 @@ object DependencyTreeSettings {
       val resultFile = dependencyGraphMLFile.value
       val graph = dependencyTreeModuleGraph0.value
       rendering.GraphML.saveAsGraphML(graph, resultFile.getAbsolutePath)
-      streams.value.log.info("Wrote dependency graph to '%s'" format resultFile)
+      streams.value.log.info(s"Wrote dependency graph to '${resultFile}'")
       resultFile
     }
 
@@ -221,7 +221,7 @@ object DependencyTreeSettings {
       val outFile = fileTask.value
       IO.write(outFile, dataTask.value, IO.utf8)
 
-      streams.value.log.info("Wrote dependency graph to '%s'" format outFile)
+      streams.value.log.info(s"Wrote dependency graph to '${outFile}'")
       outFile
     }