diff --git a/build.sbt b/build.sbt
index 0b8b47e..86b22fc 100644
--- a/build.sbt
+++ b/build.sbt
@@ -1,6 +1,6 @@
 ThisBuild / version := "0.1.0-SNAPSHOT"
 
-ThisBuild / scalaVersion := "2.13.12"
+ThisBuild / scalaVersion := "2.13.8"
 
 lazy val root = (project in file("."))
   .settings(
@@ -8,4 +8,5 @@ lazy val root = (project in file("."))
   )
 
 libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.10" % "test"
+libraryDependencies += "log4j" % "log4j" % "1.2.4"