diff --git a/.github/workflows/update-flake-lock.yml b/.github/workflows/update-flake-lock.yml
new file mode 100644
index 0000000..73d8018
--- /dev/null
+++ b/.github/workflows/update-flake-lock.yml
@@ -0,0 +1,19 @@
+name: update-flake-lock
+on:
+  workflow_dispatch: # allows manual triggering
+  schedule:
+    - cron: '0 0 * * 0' # runs weekly on Sunday at 00:00
+
+jobs:
+  lockfile:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+      - name: Install Nix
+        uses: cachix/install-nix-action@v16
+        with:
+          extra_nix_config: |
+            access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
+      - name: Update flake.lock
+        uses: DeterminateSystems/update-flake-lock@v8
diff --git a/flake.lock b/flake.lock
index 19cd175..1a96b76 100644
--- a/flake.lock
+++ b/flake.lock
@@ -2,11 +2,11 @@
   "nodes": {
     "flake-utils": {
       "locked": {
-        "lastModified": 1644229661,
-        "narHash": "sha256-1YdnJAsNy69bpcjuoKdOYQX0YxZBiCYZo4Twxerqv7k=",
+        "lastModified": 1648297722,
+        "narHash": "sha256-W+qlPsiZd8F3XkzXOzAoR+mpFqzm3ekQkJNa+PIh1BQ=",
         "owner": "numtide",
         "repo": "flake-utils",
-        "rev": "3cecb5b042f7f209c56ffd8371b2711a290ec797",
+        "rev": "0f8662f1319ad6abf89b3380dd2722369fc51ade",
         "type": "github"
       },
       "original": {
@@ -17,17 +17,18 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1642903813,
-        "narHash": "sha256-0lNfGW8sNfyTrixoQhVG00Drl/ECaf5GbfKAQ1ZDoyE=",
-        "owner": "NixOS",
+        "lastModified": 1649314464,
+        "narHash": "sha256-dU/Ed+VXtCAWbwRtHg9KPnskhRypB0nMb9Av/OOrV84=",
+        "owner": "aforemny",
         "repo": "nixpkgs",
-        "rev": "689b76bcf36055afdeb2e9852f5ecdd2bf483f87",
+        "rev": "3d88f74c9d13e599d1bd3633e8afb197b8378071",
         "type": "github"
       },
       "original": {
-        "id": "nixpkgs",
-        "ref": "nixos-unstable",
-        "type": "indirect"
+        "owner": "aforemny",
+        "ref": "fix/elm-format",
+        "repo": "nixpkgs",
+        "type": "github"
       }
     },
     "root": {
diff --git a/flake.nix b/flake.nix
index 742dc45..027200f 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,15 +1,15 @@
 {
   description = "Code behind search.nixos.org";
 
-  nixConfig = {
-    extra-substituters = [ "https://nixos-search.cachix.org" ];
-    extra-trusted-public-keys = [ "nixos-search.cachix.org-1:1HV3YF8az4fywnH+pAd+CXFEdpTXtv9WpoivPi+H70o=" ];
-  };
+  nixConfig.extra-substituters = [ "https://nixos-search.cachix.org" ];
+  nixConfig.extra-trusted-public-keys = [ "nixos-search.cachix.org-1:1HV3YF8az4fywnH+pAd+CXFEdpTXtv9WpoivPi+H70o=" ];
 
-  inputs = {
-    nixpkgs.url = "nixpkgs/nixos-unstable";
-    flake-utils.url = "github:numtide/flake-utils";
-  };
+  # TODO: follow nixos-unstable once elm-format fix is merged and release 
+  #       on nixos-unstable channels:
+  #         https://github.com/NixOS/nixpkgs/pull/167642
+  # inputs.nixpkgs.url = "nixpkgs/nixos-unstable";
+  inputs.nixpkgs.url = "github:aforemny/nixpkgs/fix/elm-format";
+  inputs.flake-utils.url = "github:numtide/flake-utils";
 
   outputs = { self
             , nixpkgs