diff --git a/.gitignore b/.gitignore
index 5de9de5..db5f55c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -142,6 +142,3 @@ crashlytics-build.properties
 .bsp/
 .metals/
 .vscode/
-
-# asdf
-.tool-versions
\ No newline at end of file
diff --git a/.tool-versions b/.tool-versions
new file mode 100644
index 0000000..cff4b12
--- /dev/null
+++ b/.tool-versions
@@ -0,0 +1 @@
+java corretto-21.0.3.9.1
diff --git a/build.sbt b/build.sbt
index d8d90b5..f610eeb 100644
--- a/build.sbt
+++ b/build.sbt
@@ -29,7 +29,7 @@ lazy val commonSettings = Seq(
     "-deprecation",
     "-feature",
     "-unchecked",
-    "-release:8",
+    "-release:11",
     "-Xfatal-warnings"
   ),
   Test / testOptions ++= Seq(