diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index a0fe146..2a38795 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -25,4 +25,4 @@ jobs:
           keep-derivations = true
           experimental-features = nix-command flakes
     - run:
-        nix-shell -I nixpkgs=https://github.com/NixOS/nixpkgs-channels/archive/nixpkgs-unstable.tar.gz ci.nix --run 'true'
+        nix-shell -I nixpkgs=https://github.com/NixOS/nixpkgs/archive/nixpkgs-unstable.tar.gz ci.nix --run 'true'
diff --git a/direnvrc b/direnvrc
index 8a2c8ef..df5b65b 100644
--- a/direnvrc
+++ b/direnvrc
@@ -123,7 +123,7 @@ use_nix() {
   path=$("${NIX_BIN_PREFIX}nix-instantiate" --find-file nixpkgs)
   layout_dir=$(direnv_layout_dir)
   local experimental_flags=()
-  if nix-shell --experimental-features '' --version 2>/dev/null; then
+  if nix-shell --experimental-features '' --version 2>/dev/null >&2; then
     experimental_flags+=('--experimental-features' 'nix-command flakes')
   fi