diff --git a/.github/workflows/cicd.yml b/.github/workflows/cicd.yml
index c965063..b46974c 100644
--- a/.github/workflows/cicd.yml
+++ b/.github/workflows/cicd.yml
@@ -48,31 +48,11 @@ jobs:
           - macos-12
           - macos-11
         nix_version:
+          - 2.21.0
+          - 2.20.5
           - 2.19.3
           - 2.18.1
-          - 2.17.1
-          - 2.16.2
-          - 2.15.3
-          - 2.14.1
-          - 2.13.6
-          - 2.12.1
-          - 2.11.1
-          - 2.10.3
-          - 2.9.2
-          - 2.8.1
-          - 2.7.0
-          - 2.6.1
-          - 2.5.1
-          - 2.4
           - 2.3.17
-          - 2.2.2
-          - 2.1.3
-          - 2.0.4
-        exclude:
-          - os: macos-11
-            nix_version: 2.0.4
-          - os: macos-12
-            nix_version: 2.0.4
     runs-on: ${{ matrix.os }}
     steps:
       - uses: divnix/nix-cache-action@v3.0.11-nix
@@ -95,9 +75,9 @@ jobs:
         run: nix-build -v --version
       - name: Add to store
         run: |
-          file="$(mktemp)"
+          file="$RANDOM"
           echo "$RANDOM" > "$file"
-          path="$(nix-store --add "$file")"
+          path="$(nix-store --add "./$file")"
           mkdir -p ~/.cache/nix
           ln -s "$path" ~/.cache/nix/test-path
 
@@ -112,43 +92,11 @@ jobs:
           - macos-12
           - macos-11
         nix_version:
+          - 2.21.0
+          - 2.20.5
           - 2.19.3
           - 2.18.1
-          - 2.17.1
-          - 2.16.2
-          - 2.15.3
-          - 2.14.1
-          - 2.13.6
-          - 2.12.1
-          - 2.11.1
-          - 2.10.3
-          - 2.9.2
-          - 2.8.1
-          - 2.7.0
-          - 2.6.1
-          - 2.5.1
-          - 2.4
           - 2.3.17
-          - 2.2.2
-        include:
-          - nix_version: 2.12.1
-            nix_conf: experimental-features = nix-command
-          - nix_version: 2.11.1
-            nix_conf: experimental-features = nix-command
-          - nix_version: 2.10.3
-            nix_conf: experimental-features = nix-command
-          - nix_version: 2.9.2
-            nix_conf: experimental-features = nix-command
-          - nix_version: 2.8.1
-            nix_conf: experimental-features = nix-command
-          - nix_version: 2.7.0
-            nix_conf: experimental-features = nix-command
-          - nix_version: 2.6.1
-            nix_conf: experimental-features = nix-command
-          - nix_version: 2.5.1
-            nix_conf: experimental-features = nix-command
-          - nix_version: 2.4
-            nix_conf: experimental-features = nix-command
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v3
@@ -189,31 +137,11 @@ jobs:
           - macos-12
           - macos-11
         nix_version:
+          - 2.21.0
+          - 2.20.5
           - 2.19.3
           - 2.18.1
-          - 2.17.1
-          - 2.16.2
-          - 2.15.3
-          - 2.14.1
-          - 2.13.6
-          - 2.12.1
-          - 2.11.1
-          - 2.10.3
-          - 2.9.2
-          - 2.8.1
-          - 2.7.0
-          - 2.6.1
-          - 2.5.1
-          - 2.4
           - 2.3.17
-          - 2.2.2
-          - 2.1.3
-          - 2.0.4
-        exclude:
-          - os: macos-11
-            nix_version: 2.0.4
-          - os: macos-12
-            nix_version: 2.0.4
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v3
diff --git a/flake.lock b/flake.lock
index 7102411..4a02ebb 100644
--- a/flake.lock
+++ b/flake.lock
@@ -15,123 +15,24 @@
         "type": "github"
       }
     },
-    "nixpkgs-nix-2_0_4": {
-      "flake": false,
-      "locked": {
-        "lastModified": 1527759064,
-        "narHash": "sha256-kX41SrZtOGS8fZ2hl70Z6z88YpKz5JzPyW6tK8NAQPs=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "47b85dc5ab8243a653c20d4851a3e6c966877251",
-        "type": "github"
-      },
-      "original": {
-        "id": "nixpkgs",
-        "rev": "47b85dc5ab8243a653c20d4851a3e6c966877251",
-        "type": "indirect"
-      }
-    },
-    "nixpkgs-nix-2_1_3": {
-      "flake": false,
-      "locked": {
-        "lastModified": 1538471268,
-        "narHash": "sha256-9u69BPAR6cKGx6aTtAK06Y8xrl//noTKH50uT/03j1k=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "2c9265c95075170ad210ed5635ecffcd36db6b84",
-        "type": "github"
-      },
-      "original": {
-        "id": "nixpkgs",
-        "rev": "2c9265c95075170ad210ed5635ecffcd36db6b84",
-        "type": "indirect"
-      }
-    },
-    "nixpkgs-nix-2_2_2": {
-      "flake": false,
-      "locked": {
-        "lastModified": 1555348017,
-        "narHash": "sha256-H9pNvBAGGWsbTCjtG5qKwvbSBLUM3JgxUelIG4snAyo=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "5399f34ad9481849720d14605ce87b81abe202e9",
-        "type": "github"
-      },
-      "original": {
-        "id": "nixpkgs",
-        "rev": "5399f34ad9481849720d14605ce87b81abe202e9",
-        "type": "indirect"
-      }
-    },
-    "nixpkgs-nix-2_4": {
-      "locked": {
-        "lastModified": 1636483627,
-        "narHash": "sha256-cdfUgplxnNpZEGodlmMvvPdN3D8T1LvWuZRY3dSwQyo=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "e912008eef096f52f28cf87492830c54ef334eb4",
-        "type": "github"
-      },
-      "original": {
-        "id": "nixpkgs",
-        "rev": "e912008eef096f52f28cf87492830c54ef334eb4",
-        "type": "indirect"
-      }
-    },
-    "nixpkgs-nix-2_5_1": {
-      "locked": {
-        "lastModified": 1640029233,
-        "narHash": "sha256-fQv3yVpaBOqnlxQyazSgITvbE9Bqf90l4+IMvjCg0iw=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "89f196fe781c53cb50fef61d3063fa5e8d61b6e5",
-        "type": "github"
-      },
-      "original": {
-        "id": "nixpkgs",
-        "rev": "89f196fe781c53cb50fef61d3063fa5e8d61b6e5",
-        "type": "indirect"
-      }
-    },
-    "nixpkgs-nix-2_9_2": {
-      "locked": {
-        "lastModified": 1671692767,
-        "narHash": "sha256-D2XVX2BdLhzkMbXgjbYxXKhYozhOOJH71UcQQPQxRug=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "593d839e8fadea1183e071186ae1b584792d4884",
-        "type": "github"
-      },
-      "original": {
-        "id": "nixpkgs",
-        "rev": "593d839e8fadea1183e071186ae1b584792d4884",
-        "type": "indirect"
-      }
-    },
     "nixpkgs-unstable": {
       "locked": {
-        "lastModified": 1709810369,
-        "narHash": "sha256-XKdxvydyo7KxrQ/3ThIomdxiRzAsd9wvApxQArtDE0s=",
+        "lastModified": 1710488417,
+        "narHash": "sha256-A5SpzNaspccN9yT2/haxWeO7AVLNeDQpDT5FkZl853M=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "627771c19dba1d4cbee75dccb402388ba8023fda",
+        "rev": "295ee8d482bc8620fa2c3757c7a95a7e824222bc",
         "type": "github"
       },
       "original": {
         "id": "nixpkgs",
-        "rev": "627771c19dba1d4cbee75dccb402388ba8023fda",
+        "rev": "295ee8d482bc8620fa2c3757c7a95a7e824222bc",
         "type": "indirect"
       }
     },
     "root": {
       "inputs": {
         "flake-utils": "flake-utils",
-        "nixpkgs-nix-2_0_4": "nixpkgs-nix-2_0_4",
-        "nixpkgs-nix-2_1_3": "nixpkgs-nix-2_1_3",
-        "nixpkgs-nix-2_2_2": "nixpkgs-nix-2_2_2",
-        "nixpkgs-nix-2_4": "nixpkgs-nix-2_4",
-        "nixpkgs-nix-2_5_1": "nixpkgs-nix-2_5_1",
-        "nixpkgs-nix-2_9_2": "nixpkgs-nix-2_9_2",
         "nixpkgs-unstable": "nixpkgs-unstable"
       }
     }
diff --git a/flake.nix b/flake.nix
index 4ed8a2c..de381be 100644
--- a/flake.nix
+++ b/flake.nix
@@ -3,16 +3,7 @@
 
   inputs = {
     flake-utils.url = "github:numtide/flake-utils";
-    nixpkgs-unstable.url = "nixpkgs/627771c19dba1d4cbee75dccb402388ba8023fda";
-    nixpkgs-nix-2_9_2.url = "nixpkgs/593d839e8fadea1183e071186ae1b584792d4884";
-    nixpkgs-nix-2_5_1.url = "nixpkgs/89f196fe781c53cb50fef61d3063fa5e8d61b6e5";
-    nixpkgs-nix-2_4.url = "nixpkgs/e912008eef096f52f28cf87492830c54ef334eb4";
-    nixpkgs-nix-2_2_2.url = "nixpkgs/5399f34ad9481849720d14605ce87b81abe202e9";
-    nixpkgs-nix-2_2_2.flake = false;
-    nixpkgs-nix-2_1_3.url = "nixpkgs/2c9265c95075170ad210ed5635ecffcd36db6b84";
-    nixpkgs-nix-2_1_3.flake = false;
-    nixpkgs-nix-2_0_4.url = "nixpkgs/47b85dc5ab8243a653c20d4851a3e6c966877251";
-    nixpkgs-nix-2_0_4.flake = false;
+    nixpkgs-unstable.url = "nixpkgs/295ee8d482bc8620fa2c3757c7a95a7e824222bc";
   };
 
   nixConfig = {
@@ -25,12 +16,6 @@
     self,
     flake-utils,
     nixpkgs-unstable,
-    nixpkgs-nix-2_9_2,
-    nixpkgs-nix-2_5_1,
-    nixpkgs-nix-2_4,
-    nixpkgs-nix-2_2_2,
-    nixpkgs-nix-2_1_3,
-    nixpkgs-nix-2_0_4
   }:
   let allSystems = ["x86_64-linux" "x86_64-darwin"];
   in flake-utils.lib.eachSystem allSystems (system:
@@ -67,27 +52,11 @@
       nixVersions = system: lib.listToAttrs (map (nix: lib.nameValuePair
         nix.version nix
       ) (
-        [ nixpkgs-unstable.legacyPackages.${system}.nixVersions.nix_2_19
+        [ nixpkgs-unstable.legacyPackages.${system}.nixVersions.nix_2_21
+          nixpkgs-unstable.legacyPackages.${system}.nixVersions.nix_2_20
+          nixpkgs-unstable.legacyPackages.${system}.nixVersions.nix_2_19
           nixpkgs-unstable.legacyPackages.${system}.nixVersions.nix_2_18
-          nixpkgs-unstable.legacyPackages.${system}.nixVersions.nix_2_17
-          nixpkgs-unstable.legacyPackages.${system}.nixVersions.nix_2_16
-          nixpkgs-unstable.legacyPackages.${system}.nixVersions.nix_2_15
-          nixpkgs-unstable.legacyPackages.${system}.nixVersions.nix_2_14
-          nixpkgs-unstable.legacyPackages.${system}.nixVersions.nix_2_13
-          nixpkgs-unstable.legacyPackages.${system}.nixVersions.nix_2_12
-          nixpkgs-unstable.legacyPackages.${system}.nixVersions.nix_2_11
-          nixpkgs-unstable.legacyPackages.${system}.nixVersions.nix_2_10
-          nixpkgs-nix-2_9_2.legacyPackages.${system}.nixVersions.nix_2_9
-          nixpkgs-nix-2_9_2.legacyPackages.${system}.nixVersions.nix_2_8
-          nixpkgs-nix-2_9_2.legacyPackages.${system}.nixVersions.nix_2_7
-          nixpkgs-nix-2_9_2.legacyPackages.${system}.nixVersions.nix_2_6
-          nixpkgs-nix-2_5_1.legacyPackages.${system}.nix
-          nixpkgs-nix-2_4.legacyPackages.${system}.nix
           nixpkgs-unstable.legacyPackages.${system}.nixVersions.minimum
-          (import nixpkgs-nix-2_2_2 { inherit system; }).nix
-          (import nixpkgs-nix-2_1_3 { inherit system; }).nix
-        ] ++ lib.optionals (system == "x86_64-linux") [
-          (import nixpkgs-nix-2_0_4 { inherit system; }).nix
         ]
       ));