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..19a1fd1
--- /dev/null
+++ b/.tool-versions
@@ -0,0 +1,3 @@
+yarn 1.22.10
+nodejs 15.7.0
+python 2.7.18 3.9.0