diff --git a/CHANGELOG.md b/CHANGELOG.md
index 468371d..ff01bd7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## Removed
 - Removed dependency constraint [#221](https://github.com/ie3-institute/powerflow/issues/221)
 
+### Changed
+- Upgraded to `scala3` [#204](https://github.com/ie3-institute/powerflow/issues/204)
+
 ## [0.2]
 
 ### Changed
diff --git a/Jenkinsfile b/Jenkinsfile
index 6a7ba82..246b1d9 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -54,7 +54,7 @@ String featureBranchName = ""
 
 //// gradle tasks that are executed
 def gradleTasks = "--refresh-dependencies clean spotlessCheck pmdMain pmdTest check" // the gradle tasks that are executed on ALL projects
-def mainProjectGradleTasks = "reportScoverage checkScoverage" // additional tasks that are only executed on project 0 (== main project)
+def mainProjectGradleTasks = "reportScoverage" // additional tasks that are only executed on project 0 (== main project)
 
 /// commit hash
 def commitHash = ""
diff --git a/build.gradle b/build.gradle
index 02ee3e9..44058eb 100644
--- a/build.gradle
+++ b/build.gradle
@@ -14,8 +14,8 @@ plugins {
 
 ext {
   javaVersion = JavaVersion.VERSION_17
-  scalaVersion = '2.13'
-  scalaBinaryVersion = '2.13.16'
+  scalaVersion = '3'
+  scalaBinaryVersion = '3.6.4'
 
   scapegoatVersion = '3.1.8'
 
@@ -48,7 +48,7 @@ repositories {
 dependencies {
 
   // CORE Scala //
-  implementation "org.scala-lang:scala-library:${scalaBinaryVersion}"
+  implementation "org.scala-lang:scala3-library_3:${scalaBinaryVersion}"
 
   // TEST Scala //
   testImplementation "org.scalatest:scalatest_${scalaVersion}:3.2.15"
@@ -60,11 +60,11 @@ dependencies {
   scalaCompilerPlugin "com.sksamuel.scapegoat:scalac-scapegoat-plugin_${scalaBinaryVersion}:${scapegoatVersion}" // scala scapegoat
 
   // logging //
-  implementation "com.typesafe.scala-logging:scala-logging_${scalaVersion}:3.9.5" // akka scala logging
+  implementation "com.typesafe.scala-logging:scala-logging_${scalaVersion}:3.9.5" // pekko scala logging
   implementation "ch.qos.logback:logback-classic:1.5.18"
 
   // used for ArrayHelper
-  implementation('com.github.ie3-institute:PowerSystemUtils:2.2.1') {
+  implementation('com.github.ie3-institute:PowerSystemUtils:3.1.0') {
     exclude group: 'org.apache.logging.log4j'
     exclude group: 'org.slf4j'
     /* Exclude our own nested dependencies */
@@ -75,7 +75,7 @@ dependencies {
   implementation 'org.apache.commons:commons-math3:3.6.1'
   implementation 'org.apache.commons:commons-lang3:3.17.0' // for HashCodeBuilder
   implementation 'javax.measure:unit-api:2.2'
-  implementation 'org.scalanlp:breeze_2.13:2.1.0' // Scientific calculations
+  implementation "org.scalanlp:breeze_${scalaVersion}:2.1.0" // Scientific calculations
 }
 
 /* scapegoat hook configuration
diff --git a/gradle/scripts/scoverage.gradle b/gradle/scripts/scoverage.gradle
index 2424fbd..919b69a 100644
--- a/gradle/scripts/scoverage.gradle
+++ b/gradle/scripts/scoverage.gradle
@@ -4,7 +4,6 @@
  */
 scoverage {
   scoverageVersion = "2.3.0"
-  scoverageScalaVersion = scalaBinaryVersion
   coverageOutputHTML = false
   coverageOutputXML = true
   coverageOutputCobertura = false
diff --git a/src/main/scala/edu/ie3/powerflow/NewtonRaphsonPF.scala b/src/main/scala/edu/ie3/powerflow/NewtonRaphsonPF.scala
index 8c80faa..0b9203f 100644
--- a/src/main/scala/edu/ie3/powerflow/NewtonRaphsonPF.scala
+++ b/src/main/scala/edu/ie3/powerflow/NewtonRaphsonPF.scala
@@ -306,7 +306,7 @@ case object NewtonRaphsonPF extends LazyLogging {
     val v = StateData.extractVoltageVector(state)
     val nodalPower = v *:* (admittanceMatrix * v).map(i => i.conjugate)
     (state zip nodalPower.toScalaVector).map(stateAndPowerPair =>
-      stateAndPowerPair._1.copy(power = -1 * stateAndPowerPair._2)
+      stateAndPowerPair._1.copy(power = stateAndPowerPair._2 * -1)
     )
   }