diff --git a/build.gradle b/build.gradle
index 8b21a0e..9a3836e 100644
--- a/build.gradle
+++ b/build.gradle
@@ -4,12 +4,12 @@ version '1.3.1'
 final MainClassName = "${group}.Main"
 
 // See http://plantuml.com/changes
-final PlantUmlVersion = "1.2018.3"
+final PlantUmlVersion = "1.2018.8"
 
 final ArchiveName = "plantuml-service.jar"
 
 buildscript {
-    ext.kotlin_version = '1.2.31'
+    ext.kotlin_version = '1.2.50'
     repositories {
         jcenter()
     }
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
index f6b961f..758de96 100644
Binary files a/gradle/wrapper/gradle-wrapper.jar and b/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 9a4163a..debd024 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.6-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.8.1-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/src/main/kotlin/com/bitjourney/plantuml/Main.kt b/src/main/kotlin/com/bitjourney/plantuml/Main.kt
index 7bdcb23..3d4e46a 100644
--- a/src/main/kotlin/com/bitjourney/plantuml/Main.kt
+++ b/src/main/kotlin/com/bitjourney/plantuml/Main.kt
@@ -5,9 +5,7 @@ import com.github.benmanes.caffeine.cache.LoadingCache
 import com.google.gson.JsonObject
 import net.sourceforge.plantuml.Option
 import net.sourceforge.plantuml.SourceStringReader
-import net.sourceforge.plantuml.code.AsciiEncoder
-import net.sourceforge.plantuml.code.CompressionZlib
-import net.sourceforge.plantuml.code.TranscoderImpl
+import net.sourceforge.plantuml.code.TranscoderSmart
 import net.sourceforge.plantuml.cucadiagram.dot.GraphvizUtils
 import org.slf4j.LoggerFactory
 import spark.Filter
@@ -65,7 +63,7 @@ class Main {
 
     val logger = LoggerFactory.getLogger(Main::class.java)
 
-    val transcoder = TranscoderImpl(AsciiEncoder(), CompressionZlib())
+    val transcoder = TranscoderSmart()
 
     val versionJson: ByteArray = JsonObject().let { json ->
         json.addProperty("PlantUML", javaClass.getPackage().specificationVersion)