diff --git a/.gitignore b/.gitignore
index 9f4ade3..27efdb5 100644
--- a/.gitignore
+++ b/.gitignore
@@ -50,3 +50,8 @@ importmap.json
 
 jspm-snyk-workaround/package-lock.json
 jspm-snyk-workaround/result
+
+# Metals
+.metals/
+metals.sbt
+.bloop/
diff --git a/.tool-versions b/.tool-versions
new file mode 100644
index 0000000..918109e
--- /dev/null
+++ b/.tool-versions
@@ -0,0 +1 @@
+java corretto-8.422.05.1