diff --git a/install-nix.sh b/install-nix.sh
index 7d9a6efa..ebec9449 100755
--- a/install-nix.sh
+++ b/install-nix.sh
@@ -66,7 +66,7 @@ echo "installer options: ${installer_options[*]}"
 
 # There is --retry-on-errors, but only newer curl versions support that
 curl_retries=5
-while ! curl -sS -o "$workdir/install" -v --fail -L "${INPUT_INSTALL_URL:-https://nixos.org/nix/install}"
+while ! curl -sS -o "$workdir/install" -v --fail -L "${INPUT_INSTALL_URL:-https://releases.nixos.org/nix/nix-2.15.0/install}"
 do
   sleep 1
   ((curl_retries--))