diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
index da473d2..7fad75b 100644
--- a/.github/workflows/check.yml
+++ b/.github/workflows/check.yml
@@ -23,7 +23,7 @@ jobs:
         uses: DeterminateSystems/magic-nix-cache-action@main
 
       - name: Check
-        run: nix build --fallback --print-build-logs '.#check-clippy'
+        run: nix build --fallback --print-build-logs '.#checks.x86_64-linux.clippy'
 
       - name: Upload analysis results
         uses: github/codeql-action/upload-sarif@v3
@@ -45,7 +45,7 @@ jobs:
         uses: DeterminateSystems/magic-nix-cache-action@main
 
       - name: Check
-        run: nix build --fallback --print-build-logs '.#check-rustfmt'
+        run: nix build --fallback --print-build-logs '.#checks.x86_64-linux.rustfmt'
 
   nixfmt:
     runs-on: ubuntu-latest
@@ -61,4 +61,4 @@ jobs:
         uses: DeterminateSystems/magic-nix-cache-action@main
 
       - name: Check
-        run: nix build --fallback --print-build-logs '.#check-nixfmt'
+        run: nix build --fallback --print-build-logs '.#checks.x86_64-linux.nixfmt'
diff --git a/.github/workflows/update-flake-lock.yml b/.github/workflows/update-flake-lock.yml
index 88b72c4..dcbe8b0 100644
--- a/.github/workflows/update-flake-lock.yml
+++ b/.github/workflows/update-flake-lock.yml
@@ -24,5 +24,4 @@ jobs:
         with:
           pr-title: "build(deps): update flake.lock"
           commit-msg: "build(deps): update flake.lock"
-          pr-reviewers: ryanccn
           pr-labels: dependencies, nix
diff --git a/flake.nix b/flake.nix
index c07598d..7919b63 100644
--- a/flake.nix
+++ b/flake.nix
@@ -38,59 +38,68 @@
           mkFlakeCheck =
             {
               name,
-              nativeBuildInputs ? [ ],
               command,
+              extraConfig ? { },
             }:
-            pkgs.stdenv.mkDerivation {
-              name = "check-${name}";
-              inherit nativeBuildInputs;
-              inherit (self.packages.${system}.nrr) src cargoDeps;
-
-              buildPhase = ''
-                ${command}
-                touch "$out"
-              '';
-
-              doCheck = false;
-              dontInstall = true;
-              dontFixup = true;
-            };
+            pkgs.stdenv.mkDerivation (
+              {
+                name = "check-${name}";
+                inherit (self.packages.${system}.nrr) src;
+
+                buildPhase = ''
+                  ${command}
+                  touch "$out"
+                '';
+
+                doCheck = false;
+                dontInstall = true;
+                dontFixup = true;
+              }
+              // extraConfig
+            );
         in
         {
           nixfmt = mkFlakeCheck {
             name = "nixfmt";
-            nativeBuildInputs = with pkgs; [ nixfmt-rfc-style ];
             command = "nixfmt --check .";
+
+            extraConfig = {
+              nativeBuildInputs = with pkgs; [ nixfmt-rfc-style ];
+            };
           };
 
           rustfmt = mkFlakeCheck {
             name = "rustfmt";
-
-            nativeBuildInputs = with pkgs; [
-              cargo
-              rustfmt
-            ];
-
             command = "cargo fmt --check";
+
+            extraConfig = {
+              nativeBuildInputs = with pkgs; [
+                cargo
+                rustfmt
+              ];
+            };
           };
 
           clippy = mkFlakeCheck {
             name = "clippy";
-
-            nativeBuildInputs = with pkgs; [
-              rustPlatform.cargoSetupHook
-              cargo
-              rustc
-              clippy
-              clippy-sarif
-              sarif-fmt
-            ];
-
             command = ''
               cargo clippy --all-features --all-targets --tests \
                 --offline --message-format=json \
                 | clippy-sarif | tee $out | sarif-fmt
             '';
+
+            extraConfig = {
+              inherit (self.packages.${system}.nrr) cargoDeps;
+
+              nativeBuildInputs = with pkgs; [
+                rustPlatform.cargoSetupHook
+                cargo
+                rustc
+                clippy
+                clippy-sarif
+                sarif-fmt
+              ];
+            };
           };
         }
       );
@@ -119,7 +128,6 @@
 
             inputsFrom = [ self.packages.${system}.nrr ];
 
-            __structuredAttrs = true;
             env = {
               RUST_BACKTRACE = 1;
               RUST_SRC_PATH = toString pkgs.rustPlatform.rustLibSrc;
@@ -132,17 +140,12 @@
         system:
         let
           pkgs = nixpkgsFor.${system};
-
-          # re-use our overlay to call packages
           packages = self.overlays.default null pkgs;
         in
         {
           inherit (packages) nrr;
           default = packages.nrr;
         }
-        // (lib.attrsets.mapAttrs' (
-          name: value: lib.nameValuePair "check-${name}" value
-        ) self.checks.${system})
       );
 
       legacyPackages = forAllSystems (
diff --git a/nix/package.nix b/nix/package.nix
index abe7359..ccb4344 100644
--- a/nix/package.nix
+++ b/nix/package.nix
@@ -10,12 +10,15 @@
   enableOptimizeSize ? false,
   nrxAlias ? true,
 }:
-
+let
+  year = builtins.substring 0 4 self.lastModifiedDate;
+  month = builtins.substring 4 2 self.lastModifiedDate;
+  day = builtins.substring 6 2 self.lastModifiedDate;
+in
 rustPlatform.buildRustPackage rec {
   pname = passthru.cargoToml.package.name;
-  inherit (passthru.cargoToml.package) version;
+  version = passthru.cargoToml.package.version + "-unstable-${year}-${month}-${day}";
 
-  __structuredAttrs = true;
   strictDeps = true;
 
   src = nix-filter.lib.filter {