diff --git a/.github/workflows/check.yaml b/.github/workflows/check.yaml
index 8dc039c..c7f21f2 100644
--- a/.github/workflows/check.yaml
+++ b/.github/workflows/check.yaml
@@ -19,4 +19,7 @@ jobs:
         with:
           name: tek
           signingKey: ${{ secrets.CACHIX_SIGNING_KEY }}
+      - run: |
+          nix flake lock
+          cat flake.lock
       - run: nix flake check
diff --git a/flake.lock b/flake.lock
index 9d069c5..0f9f099 100644
--- a/flake.lock
+++ b/flake.lock
@@ -29,8 +29,8 @@
       },
       "original": {
         "owner": "nixos",
-        "ref": "nixpkgs-unstable",
         "repo": "nixpkgs",
+        "rev": "8c4dc69b9732f6bbe826b5fbb32184987520ff26",
         "type": "github"
       }
     },
diff --git a/flake.nix b/flake.nix
index 8986dcc..456402f 100644
--- a/flake.nix
+++ b/flake.nix
@@ -2,7 +2,7 @@
   description = "Customizable quasiquote interpolation";
 
   inputs.hix.url = "git+https://git.tryp.io/tek/hix";
-  inputs.hix.inputs.nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
+  inputs.hix.inputs.nixpkgs.url = "github:nixos/nixpkgs/8c4dc69b9732f6bbe826b5fbb32184987520ff26";
 
   outputs = {hix, ...}: hix.lib.pro ({config, lib, ...}: let