diff --git a/.envrc b/.envrc
new file mode 100644
index 0000000..a63eb96
--- /dev/null
+++ b/.envrc
@@ -0,0 +1 @@
+use asdf
diff --git a/.tool-versions b/.tool-versions
new file mode 100644
index 0000000..2a04984
--- /dev/null
+++ b/.tool-versions
@@ -0,0 +1,5 @@
+python 3.9.13
+shfmt 3.5.1
+shellcheck 0.8.0
+just 1.2.0
+direnv 2.32.1