diff --git a/build.sbt b/build.sbt
index a4a9a5ee..d973c9ab 100644
--- a/build.sbt
+++ b/build.sbt
@@ -1,7 +1,7 @@
 name := "Dahlia"
 version := "0.0.2"
 
-scalaVersion := "2.13.8"
+scalaVersion := "2.13.12"
 
 libraryDependencies ++= Seq(
   "org.scalatest" %% "scalatest" % "3.0.8" % "test",
diff --git a/project/build.properties b/project/build.properties
index c8fcab54..abbbce5d 100644
--- a/project/build.properties
+++ b/project/build.properties
@@ -1 +1 @@
-sbt.version=1.6.2
+sbt.version=1.9.8
diff --git a/src/main/scala/Main.scala b/src/main/scala/Main.scala
index 3979bcd3..38b298df 100644
--- a/src/main/scala/Main.scala
+++ b/src/main/scala/Main.scala
@@ -38,7 +38,7 @@ object Main {
 
     head(s"Dahlia (sha = ${meta("git.hash")}, status = ${meta("git.status")})")
 
-    version('V', "version")
+    this.version('V', "version")
 
     arg[File]("<srcfile>")
       .required()