diff --git a/.idea/ksim65.iml b/.idea/ksim65.iml
index 78b2cc5..7b4c8a4 100644
--- a/.idea/ksim65.iml
+++ b/.idea/ksim65.iml
@@ -1,2 +1,2 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<module type="JAVA_MODULE" version="4" />
\ No newline at end of file
+<module external.linked.project.id="ksim65:main" external.linked.project.path="$MODULE_DIR$" external.root.project.path="$MODULE_DIR$" external.system.id="GRADLE" external.system.module.group="net.razorvine" external.system.module.version="1.9" type="JAVA_MODULE" version="4" />
\ No newline at end of file
diff --git a/.travis.yml b/.travis.yml
index de4ec0e..6af07e5 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,6 @@
 language: java
 sudo: false
-# jdk: openjdk8
+# jdk: openjdk11
 # dist: xenial
 
 before_install:
diff --git a/build.gradle.kts b/build.gradle.kts
index bc39805..74cd59a 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -6,7 +6,7 @@ import kotlin.math.max
 
 plugins {
     // Apply the Kotlin JVM plugin to add support for Kotlin on the JVM.
-    kotlin("jvm") version "1.4.10"
+    kotlin("jvm") version "1.4.20"
     `maven-publish`
     application
     id("org.jetbrains.dokka") version "0.10.0"
@@ -64,7 +64,7 @@ tasks {
     }
 
     withType<KotlinCompile> {
-        kotlinOptions.jvmTarget = "1.8"
+        kotlinOptions.jvmTarget = "11"
     }
 
     named<DokkaTask>("dokka") {