diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
index 1fa0765..5f3edb1 100644
--- a/.github/workflows/check.yml
+++ b/.github/workflows/check.yml
@@ -13,11 +13,11 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
-    - uses: cachix/install-nix-action@v22
+    - uses: cachix/install-nix-action@6ed004b9ccb68dbc28e7c85bee15fa93dbd214ac
       with:
         nix_path: nixpkgs=channel:nixos-23.11
         github_access_token: ${{ secrets.GITHUB_TOKEN }}
 
-    - uses: DeterminateSystems/magic-nix-cache-action@main
+    - uses: DeterminateSystems/magic-nix-cache-action@eeabdb06718ac63a7021c6132129679a8e22d0c7
     
     - run: nix flake check