diff --git a/.envrc b/.envrc
index 697ced8..56d5839 100644
--- a/.envrc
+++ b/.envrc
@@ -1 +1,5 @@
+if ! has nix_direnv_version || ! nix_direnv_version 3.0.4; then
+  source_url "https://raw.githubusercontent.com/nix-community/nix-direnv/3.0.4/direnvrc" "sha256-DzlYZ33mWF/Gs8DDeyjr8mnVmQGx7ASYqA5WlxwvBG4="
+fi
+
 use_flake .#develop --impure