diff --git a/README.md b/README.md
index b380343..726d05b 100644
--- a/README.md
+++ b/README.md
@@ -108,3 +108,14 @@ The folder resources contains the following:
 
 * TwoTriangles.ply is from Kevin Suffern, the author of the book.
 * Isis.ply was downloaded from [Cyberware](http://cyberware.com/) (dissolved since 2011 )
+
+
+## Upgrade dependencies
+
+The project uses [refreshVersions](https://splitties.github.io/refreshVersions/)
+
+```sh
+$ gradle refreshVersions
+```
+
+(c) 2010 - 2024 Jörn Dinkla https://www.dinkla.net
diff --git a/build.gradle.kts b/build.gradle.kts
index 8605233..f43e5bb 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -1,13 +1,6 @@
-val kotestVersion = "5.8.0"
-val coroutinesVersion = "1.7.3"
-val logbackVersion = "1.4.14"
-val korioVersion = "2.2.0"
-val korimVersion = "2.2.0"
-val cliktVersion = "4.2.1"
-
 plugins {
     kotlin("jvm") version "2.0.0-Beta3"
-    id("io.gitlab.arturbosch.detekt") version "1.23.5"
+    id("io.gitlab.arturbosch.detekt")
     idea
     application
 }
@@ -15,15 +8,15 @@ plugins {
 dependencies {
     implementation(kotlin("stdlib"))
     implementation(kotlin("reflect"))
-    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:$coroutinesVersion")
-    implementation("ch.qos.logback:logback-classic:$logbackVersion")
-    implementation("com.soywiz.korlibs.korio:korio:$korioVersion")
-    implementation("com.soywiz.korlibs.korim:korim:$korimVersion")
-    implementation("com.github.ajalt.clikt:clikt:$cliktVersion")
-    implementation("io.github.classgraph:classgraph:4.8.90")
+    implementation(KotlinX.coroutines.core)
+    implementation("ch.qos.logback:logback-classic:_")
+    implementation("com.soywiz.korlibs.korio:korio:_")
+    implementation("com.soywiz.korlibs.korim:korim:_")
+    implementation("com.github.ajalt.clikt:clikt:_")
+    implementation("io.github.classgraph:classgraph:_")
 
-    testImplementation("io.kotest:kotest-runner-junit5:$kotestVersion")
-    testImplementation("io.kotest:kotest-assertions-core:$kotestVersion")
+    testImplementation(Testing.kotest.runner.junit5)
+    testImplementation(Testing.kotest.assertions.core)
 }
 
 repositories {
diff --git a/settings.gradle.kts b/settings.gradle.kts
index ea992fe..42adb61 100644
--- a/settings.gradle.kts
+++ b/settings.gradle.kts
@@ -5,4 +5,8 @@ pluginManagement {
     }
 }
 
+plugins {
+    id("de.fayard.refreshVersions") version "0.60.5"
+}
+
 rootProject.name = "from-the-ground-up-ray-tracer"
diff --git a/src/commonMain/kotlin/net/dinkla/raytracer/utilities/FilenameUtilities.kt b/src/commonMain/kotlin/net/dinkla/raytracer/utilities/FilenameUtilities.kt
index fde725f..290f916 100644
--- a/src/commonMain/kotlin/net/dinkla/raytracer/utilities/FilenameUtilities.kt
+++ b/src/commonMain/kotlin/net/dinkla/raytracer/utilities/FilenameUtilities.kt
@@ -1,7 +1,7 @@
 package net.dinkla.raytracer.utilities
 
-import com.soywiz.klock.DateFormat
-import com.soywiz.klock.DateTime
+import korlibs.time.DateFormat
+import korlibs.time.DateTime
 
 private val dateFormat = DateFormat("yyyyMMddHHmmss")
 
diff --git a/src/commonMain/kotlin/net/dinkla/raytracer/utilities/Logger.kt b/src/commonMain/kotlin/net/dinkla/raytracer/utilities/Logger.kt
index ed0cc89..0083436 100644
--- a/src/commonMain/kotlin/net/dinkla/raytracer/utilities/Logger.kt
+++ b/src/commonMain/kotlin/net/dinkla/raytracer/utilities/Logger.kt
@@ -1,7 +1,8 @@
 package net.dinkla.raytracer.utilities
 
-import com.soywiz.klock.DateFormat.Companion.FORMAT2
-import com.soywiz.klock.DateTime
+import korlibs.time.DateFormat.Companion.FORMAT2
+import korlibs.time.DateTime
+
 
 object Logger {
     enum class LogLevel {
diff --git a/src/commonMain/kotlin/net/dinkla/raytracer/utilities/Timer.kt b/src/commonMain/kotlin/net/dinkla/raytracer/utilities/Timer.kt
index af103bd..abeb3e7 100644
--- a/src/commonMain/kotlin/net/dinkla/raytracer/utilities/Timer.kt
+++ b/src/commonMain/kotlin/net/dinkla/raytracer/utilities/Timer.kt
@@ -1,6 +1,6 @@
 package net.dinkla.raytracer.utilities
 
-import com.soywiz.klock.DateTime
+import korlibs.time.DateTime
 
 class Timer {
     private var start: Double = 0.0
@@ -17,5 +17,5 @@ class Timer {
         end = timeStamp()
     }
 
-    private fun timeStamp() = DateTime.nowUnix()
+    private fun timeStamp() = DateTime.now().unixMillis
 }
diff --git a/src/commonTest/kotlin/net/dinkla/raytracer/utilities/FilenameUtilitiesTest.kt b/src/commonTest/kotlin/net/dinkla/raytracer/utilities/FilenameUtilitiesTest.kt
index de5d21a..2f3fb56 100644
--- a/src/commonTest/kotlin/net/dinkla/raytracer/utilities/FilenameUtilitiesTest.kt
+++ b/src/commonTest/kotlin/net/dinkla/raytracer/utilities/FilenameUtilitiesTest.kt
@@ -1,15 +1,15 @@
 package net.dinkla.raytracer.utilities
 
-import com.soywiz.klock.DateTime
-import com.soywiz.klock.Month
-import com.soywiz.klock.Year
+
 import io.kotest.core.spec.style.StringSpec
 import io.kotest.matchers.shouldBe
+import korlibs.time.Month
+import korlibs.time.Year
 
 internal class FilenameUtilitiesTest : StringSpec({
 
     val fileNameBase = "World73"
-    val timeStamp = DateTime(Year(2022), Month.September, 17, 17, 42, 20, 0)
+    val timeStamp = korlibs.time.DateTime(Year(2022), Month.September, 17, 17, 42, 20, 0)
 
     "should exchange extension" {
         val s = outputPngFileName("$fileNameBase.kt", timeStamp)
diff --git a/src/jvmMain/kotlin/net/dinkla/raytracer/films/Film.kt b/src/jvmMain/kotlin/net/dinkla/raytracer/films/Film.kt
index cd99207..ebbca76 100644
--- a/src/jvmMain/kotlin/net/dinkla/raytracer/films/Film.kt
+++ b/src/jvmMain/kotlin/net/dinkla/raytracer/films/Film.kt
@@ -1,12 +1,12 @@
 package net.dinkla.raytracer.films
 
-import com.soywiz.korim.bitmap.Bitmap32
-import com.soywiz.korim.color.RGBA
-import com.soywiz.korim.format.PNG
-import com.soywiz.korim.format.writeBitmap
-import com.soywiz.korio.file.Vfs
-import com.soywiz.korio.file.VfsFile
-import com.soywiz.korio.file.std.localCurrentDirVfs
+import korlibs.image.bitmap.Bitmap32
+import korlibs.image.color.RGBA
+import korlibs.image.format.PNG
+import korlibs.image.format.writeBitmap
+import korlibs.io.file.Vfs
+import korlibs.io.file.VfsFile
+import korlibs.io.file.std.localCurrentDirVfs
 import net.dinkla.raytracer.colors.Color
 import net.dinkla.raytracer.utilities.Logger
 import net.dinkla.raytracer.utilities.Resolution
diff --git a/src/jvmMain/kotlin/net/dinkla/raytracer/swing/FromTheGroundUpRayTracer.kt b/src/jvmMain/kotlin/net/dinkla/raytracer/swing/FromTheGroundUpRayTracer.kt
index e47ee40..3460160 100644
--- a/src/jvmMain/kotlin/net/dinkla/raytracer/swing/FromTheGroundUpRayTracer.kt
+++ b/src/jvmMain/kotlin/net/dinkla/raytracer/swing/FromTheGroundUpRayTracer.kt
@@ -1,6 +1,6 @@
 package net.dinkla.raytracer.swing
 
-import com.soywiz.klock.DateTime
+import korlibs.time.DateTime
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
diff --git a/versions.properties b/versions.properties
new file mode 100644
index 0000000..91a9999
--- /dev/null
+++ b/versions.properties
@@ -0,0 +1,28 @@
+#### Dependencies and Plugin versions with their available updates.
+#### Generated by `./gradlew refreshVersions` version 0.60.5
+####
+#### Don't manually edit or split the comments that start with four hashtags (####),
+#### they will be overwritten by refreshVersions.
+####
+#### suppress inspection "SpellCheckingInspection" for whole file
+#### suppress inspection "UnusedProperty" for whole file
+
+version.kotlinx.coroutines=1.7.3
+##             # available=1.8.0-RC
+##             # available=1.8.0-RC2
+
+version.kotlin=2.0.0-Beta3
+
+version.kotest=5.8.0
+
+version.io.github.classgraph..classgraph=4.8.165
+
+version.com.soywiz.korlibs.korio..korio=4.0.10
+
+version.com.soywiz.korlibs.korim..korim=4.0.10
+
+version.com.github.ajalt.clikt..clikt=4.2.2
+
+version.ch.qos.logback..logback-classic=1.4.14
+
+plugin.io.gitlab.arturbosch.detekt=1.23.5