diff --git a/.github/workflows/github_pages.yml b/.github/workflows/github_pages.yml
index 279c8763a..b3739dc19 100644
--- a/.github/workflows/github_pages.yml
+++ b/.github/workflows/github_pages.yml
@@ -13,7 +13,7 @@ jobs:
     - uses: actions/checkout@v4
     - uses: cachix/install-nix-action@v31
       with:
-        nix_path: nixpkgs=channel:nixos-unstable
+        nix_path: nixpkgs=channel:nixos-25.05
     - uses: cachix/cachix-action@v16
       with:
         name: nix-community
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index e7c0a551e..c6f25cb02 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -14,7 +14,7 @@ jobs:
     - uses: actions/checkout@v4
     - uses: cachix/install-nix-action@v31
       with:
-        nix_path: nixpkgs=channel:nixos-unstable
+        nix_path: nixpkgs=channel:nixos-25.05
         extra_nix_config: |
           experimental-features = nix-command flakes
     - run: |