diff --git a/.envrc b/.envrc
new file mode 100644
index 0000000..269caf0
--- /dev/null
+++ b/.envrc
@@ -0,0 +1,2 @@
+strict_env
+source_env_if_exists .envrc.local
diff --git a/.gitignore b/.gitignore
index e0a4609..65b1b99 100644
--- a/.gitignore
+++ b/.gitignore
@@ -28,3 +28,4 @@ dist/
 *.tar
 
 demodata/
+.envrc.local