diff --git a/build.sbt b/build.sbt
index 4dbca06..01e4fa5 100644
--- a/build.sbt
+++ b/build.sbt
@@ -3,7 +3,7 @@ import java.util.Properties
 import com.sourcegraph.sbtsourcegraph.Versions
 
 val V = new {
-  def scala212 = "2.12.12"
+  def scala212 = "3.8.3"
   def scalameta = "4.4.25"
 }
 
diff --git a/src/sbt-test/sbt-sourcegraph/basic/build.sbt b/src/sbt-test/sbt-sourcegraph/basic/build.sbt
index d847b2e..0d6ae37 100644
--- a/src/sbt-test/sbt-sourcegraph/basic/build.sbt
+++ b/src/sbt-test/sbt-sourcegraph/basic/build.sbt
@@ -4,7 +4,7 @@ import java.nio.file.Files
 
 inThisBuild(
   List(
-    scalaVersion := "2.12.15",
+    scalaVersion := "3.8.3",
     organization := "com.example"
   )
 )
diff --git a/src/sbt-test/sbt-sourcegraph/scala-3/build.sbt b/src/sbt-test/sbt-sourcegraph/scala-3/build.sbt
index 20939fd..2646289 100644
--- a/src/sbt-test/sbt-sourcegraph/scala-3/build.sbt
+++ b/src/sbt-test/sbt-sourcegraph/scala-3/build.sbt
@@ -1 +1 @@
-scalaVersion := "3.3.0"
+scalaVersion := "3.8.3"