diff --git a/.github/workflows/ci-nix.yml b/.github/workflows/ci-nix.yml
index 16a771a8e..e81143863 100644
--- a/.github/workflows/ci-nix.yml
+++ b/.github/workflows/ci-nix.yml
@@ -17,7 +17,7 @@ jobs:
           fetch-depth: 0
     - uses: cachix/install-nix-action@v12
       with:
-        install_url: https://github.com/numtide/nix-flakes-installer/releases/download/nix-3.0pre20200820_4d77513/install
+        install_url: https://github.com/numtide/nix-flakes-installer/releases/download/nix-2.4pre20210126_f15f0b8/install
         extra_nix_config: |
           experimental-features = nix-command flakes
     - run: nix build