diff --git a/.envrc b/.envrc
index 3550a30..4c92382 100644
--- a/.envrc
+++ b/.envrc
@@ -1 +1,5 @@
+if ! has nix_direnv_version || ! nix_direnv_version 2.2.1; then
+  source_url "https://raw.githubusercontent.com/nix-community/nix-direnv/2.2.1/direnvrc" "sha256-zelF0vLbEl5uaqrfIzbgNzJWGmLzCmYAkInj/LNxvKs="
+fi
+
 use flake