diff --git a/README.adoc b/README.adoc
index 9719d6a..5f609b8 100644
--- a/README.adoc
+++ b/README.adoc
@@ -16,7 +16,7 @@ This application has a number of parameters that are set by a configuration file
 
 ==== Using the web interface
 
-. `sbt "~Tomcat / start"&`
+. `sbt "~WarStart` # see https://index.scala-lang.org/earldouglas/sbt-war
 . `xdg-open http://localhost:8080` # or open http://localhost:8080 on your browser
 
 ==== Using the multiple sequence aligner
diff --git a/build.sbt b/build.sbt
index b589970..cc32ec7 100644
--- a/build.sbt
+++ b/build.sbt
@@ -6,7 +6,7 @@ libraryDependencies ++= Seq(
   "com.carrotsearch"   % "jsuffixarrays" % "0.1.0",
   "net.java.dev.jna"   % "jna"           % "5.6.0",
   "org.apache.commons" % "commons-text" % "1.9",
-  "javax.servlet"  % "javax.servlet-api" % "3.1.0" % "provided",
+  "jakarta.servlet" % "jakarta.servlet-api" % "6.0.0" % Provided,
   "org.scala-lang.modules" %% "scala-xml" % "2.0.1",
   ("org.scala-lang.modules" %% "scala-collection-contrib" % "0.2.2").cross(CrossVersion.for3Use2_13),
   "org.json4s"        %% "json4s-native" % "4.0.4",
@@ -24,12 +24,12 @@ publishMavenStyle := true
 
 publishTo := Some(Resolver.file("file",  new File(Path.userHome.absolutePath+"/.m2/repository")))
 
-enablePlugins(TomcatPlugin)
+enablePlugins(SbtWar)
 
 lazy val root = (project in file(".")).
   enablePlugins(BuildInfoPlugin).
   settings(
-    scalaVersion := "3.4.2",
+    scalaVersion := "3.5.2",
     organization := "org.whym",
     name := "growthring",
     version := "0.7-SNAPSHOT",
@@ -47,6 +47,7 @@ lazy val root = (project in file(".")).
       java.time.Instant.now()
     }),
     buildInfoPackage := "org.whym.growthring",
-    buildInfoOptions += BuildInfoOption.ToMap
+    buildInfoOptions += BuildInfoOption.ToMap,
+    warPort := 8080
   )
 
diff --git a/project/plugins.sbt b/project/plugins.sbt
index afacb90..d52c5e9 100644
--- a/project/plugins.sbt
+++ b/project/plugins.sbt
@@ -2,6 +2,6 @@
 
 addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "1.2.0")
 addSbtPlugin("com.eed3si9n" % "sbt-buildinfo" % "0.11.0")
-addSbtPlugin("com.earldouglas" % "xsbt-web-plugin" % "4.2.4")
+addSbtPlugin("com.earldouglas" % "sbt-war" % "5.0.0-M4")
 addSbtPlugin("ch.epfl.scala" % "sbt-scalafix" % "0.11.1")
 addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.4.6")
diff --git a/src/main/scala/org/whym/growthring/servlets.scala b/src/main/scala/org/whym/growthring/servlets.scala
index 0cece9f..5a8be6b 100644
--- a/src/main/scala/org/whym/growthring/servlets.scala
+++ b/src/main/scala/org/whym/growthring/servlets.scala
@@ -6,8 +6,8 @@
 package org.whym.growthring
 
 import scala.jdk.CollectionConverters.*
-import javax.servlet.http.{HttpServlet, HttpServletRequest, HttpServletResponse}
-import javax.servlet.ServletConfig
+import jakarta.servlet.http.{HttpServlet, HttpServletRequest, HttpServletResponse}
+import jakarta.servlet.ServletConfig
 import org.json4s.{JObject, JField, JArray, JValue, JInt}
 import org.json4s.native.JsonMethods.*
 import org.json4s.JsonDSL.*
diff --git a/src/test/scala/test-servlets.scala b/src/test/scala/test-servlets.scala
index 7268086..44a5a14 100644
--- a/src/test/scala/test-servlets.scala
+++ b/src/test/scala/test-servlets.scala
@@ -7,7 +7,7 @@ import org.whym.growthring._
 import scala.jdk.CollectionConverters._
 import org.scalatest.funsuite.AnyFunSuite
 import java.io.{ Writer, PrintWriter, StringWriter }
-import javax.servlet.http.{ HttpServlet, HttpServletRequest, HttpServletResponse }
+import jakarta.servlet.http.{ HttpServlet, HttpServletRequest, HttpServletResponse }
 import org.mockito.Mockito._
 import org.scalatestplus.mockito.MockitoSugar
 import org.json4s.{ JInt, JString, JField, JObject, JArray, JValue }