diff --git a/build.sbt b/build.sbt
index 214d14a..927e416 100644
--- a/build.sbt
+++ b/build.sbt
@@ -2,25 +2,18 @@ name := "gitbucket-plantuml-plugin"
 
 organization := "com.yotaichino"
 
-version := "1.7.0"
+version := "1.8.0"
 
 scalaVersion := "2.13.7"
-gitbucketVersion := "4.37.0"
+gitbucketVersion := "4.36.0"
 
 libraryDependencies ++= Seq(
   "org.scalatest"            %% "scalatest"          % "3.0.8" % "test"
 )
 
-scalacOptions := Seq("-deprecation", "-feature", "-language:postfixOps", "-Ydelambdafy:method", "-target:jvm-1.8")
-javacOptions in compile ++= Seq("-target", "8", "-source", "8")
+libraryDependencies += "net.sourceforge.plantuml" % "plantuml-asl" % "1.2025.0"
 
-useJCenter := true 
+scalacOptions := Seq("-deprecation", "-feature", "-language:postfixOps", "-Ydelambdafy:method", "-target:jvm-1.8")
+Compile / javacOptions ++= Seq("-target", "8", "-source", "17")
 
-lazy val downloadPlantuml = taskKey[Unit]("Download the PlantUML ASL Version.")
-downloadPlantuml := {
-  val url = "https://downloads.sourceforge.net/project/plantuml/1.2022.5/plantuml-jar-asl-1.2022.5.zip"
-  if (java.nio.file.Files.notExists(new File("lib/plantuml.jar").toPath())) {
-    println(url)
-    IO.unzipURL(new URL(url), new File("lib"))
-  }
-}
+useJCenter := true
diff --git a/src/main/scala/Plugin.scala b/src/main/scala/Plugin.scala
index 2c5bb3a..e5ce0b5 100644
--- a/src/main/scala/Plugin.scala
+++ b/src/main/scala/Plugin.scala
@@ -22,7 +22,8 @@ class Plugin extends gitbucket.core.plugin.Plugin {
     new Version("1.6.0"),
     new Version("1.6.1"),
     new Version("1.6.2"),
-    new Version("1.7.0")
+    new Version("1.7.0"),
+    new Version("1.8.0")
   )
 
   override def initialize(registry: PluginRegistry, context: ServletContext, settings: SystemSettings): Unit = {
diff --git a/src/main/scala/com/yotaichino/gitbucket/plugins/plantuml/PlantUMLController.scala b/src/main/scala/com/yotaichino/gitbucket/plugins/plantuml/PlantUMLController.scala
index 6c13e24..e5f433f 100644
--- a/src/main/scala/com/yotaichino/gitbucket/plugins/plantuml/PlantUMLController.scala
+++ b/src/main/scala/com/yotaichino/gitbucket/plugins/plantuml/PlantUMLController.scala
@@ -28,9 +28,9 @@ trait PlantUMLControllerBase extends ControllerBase {
               contentType = "image/svg+xml"
               PlantUMLUtils.generateSVGImage(new String(content))
             }
-          case _ => unsupportedMediaType
+          case _ => unsupportedMediaType()
         }
-      } getOrElse NotFound
+      } getOrElse NotFound()
     }
   })
 
diff --git a/src/test/scala/plugin/PlantUMLUtilsSpec.scala b/src/test/scala/plugin/PlantUMLUtilsSpec.scala
index 39172bc..64e990e 100644
--- a/src/test/scala/plugin/PlantUMLUtilsSpec.scala
+++ b/src/test/scala/plugin/PlantUMLUtilsSpec.scala
@@ -5,7 +5,8 @@ class PlantUMLUtilsSpec extends FunSpec {
   describe("generateSVGImage") {
     it("should return a SVG image.") {
       val content = new String(PlantUMLUtils.generateSVGImage("@startuml\n@enduml"), "utf-8")
-      assert(content.startsWith("""<?xml version="1.0" encoding="UTF-8" standalone="no"?><svg"""))
+      println(content)
+      assert(content.startsWith("""<svg xmlns="http://www.w3.org/2000/svg" """))
     }
     it("should return null when empty string") {
       assert(PlantUMLUtils.generateSVGImage("") == null)