diff --git a/build.sbt b/build.sbt
index 428e3a1..2fdec67 100644
--- a/build.sbt
+++ b/build.sbt
@@ -1,7 +1,7 @@
 import xerial.sbt.Sonatype._
 
-lazy val scala213 = "2.13.0"
-lazy val scala212 = "2.12.8"
+lazy val scala213 = "2.13.1"
+lazy val scala212 = "2.12.11"
 lazy val scala211 = "2.11.12"
 
 lazy val supportedScalaVersions = List(scala211, scala212, scala213)
@@ -10,7 +10,7 @@ ThisBuild / organization := "com.olegpy"
 ThisBuild / version := "0.3.1"
 ThisBuild / licenses += ("MIT", url("http://opensource.org/licenses/MIT"))
 ThisBuild / homepage := Some(url("http://github.com/oleg-py/better-monadic-for"))
-ThisBuild / scalaVersion := scala212
+ThisBuild / scalaVersion := Option(System.getenv("SCALA_VERSION")).filter(_.nonEmpty).getOrElse(scala213)
 
 val testSettings = Seq(
   libraryDependencies ++= Seq(
@@ -107,4 +107,4 @@ lazy val wartRemoverTests = (project in file("wartremover-tests"))
     addCompilerPlugin("org.wartremover" %% "wartremover" % "2.4.2"),
     scalacOptions += "-P:wartremover:traverser:org.wartremover.warts.NonUnitStatements"
   )
-  .settings(testSettings)
\ No newline at end of file
+  .settings(testSettings)