diff --git a/Readme.md b/Readme.md
index dfc4521..9c67033 100644
--- a/Readme.md
+++ b/Readme.md
@@ -126,6 +126,12 @@ val eulerAngles = Vec3d(math.Pi * 0.5, 0.0, math.Pi * 0.5)
 val rotation = QuaternionD(eulerAngles)
 ```
 
+## Complex numbers
+
+An additional library providing complex numbers can be found here: [CmplxLib](https://github.com/HexagonNico/CmplxLib)
+
+CmplxLib depend on VecMatLib and provides complex numbers, as well as complex vectors and complex matrices.
+
 ## Using with LWJGL
 
 VecMatLib can be used together with [LWJGL](https://lwjgl.org) to build transformation matrices and set uniform
diff --git a/build.sbt b/build.sbt
index 8aa9175..61fd0fd 100644
--- a/build.sbt
+++ b/build.sbt
@@ -1,6 +1,6 @@
 ThisBuild / version := "2.3"
 
-ThisBuild / scalaVersion := "2.13.10"
+ThisBuild / scalaVersion := "2.13.12"
 
 lazy val root = (project in file(".")).settings(
   name := "VecMatLib"
@@ -10,10 +10,8 @@ lazy val root = (project in file(".")).settings(
 libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.15" % Test
 
 // Junit test dependency
-libraryDependencies ++= Seq(
-  "junit" % "junit" % "4.13.2" % Test,
-  "com.novocode" % "junit-interface" % "0.11" % Test
-)
+libraryDependencies += "com.github.sbt" % "junit-interface" % "0.13.3" % Test
+crossPaths := false
 
 // Publishing
 ThisBuild / organization := "io.github.hexagonnico"
diff --git a/project/build.properties b/project/build.properties
index 62499c3..b19d4e1 100644
--- a/project/build.properties
+++ b/project/build.properties
@@ -1 +1 @@
-sbt.version = 1.9.1
+sbt.version = 1.9.7