diff --git a/flake.lock b/flake.lock
index b0fc03bc..f46c42bf 100644
--- a/flake.lock
+++ b/flake.lock
@@ -348,7 +348,25 @@
     },
     "flake-utils": {
       "inputs": {
-        "systems": "systems_4"
+        "systems": "systems_3"
+      },
+      "locked": {
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "flake-utils_2": {
+      "inputs": {
+        "systems": "systems_5"
       },
       "locked": {
         "lastModified": 1731533236,
@@ -902,6 +920,27 @@
         "type": "github"
       }
     },
+    "masssprings": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1772672702,
+        "narHash": "sha256-2OktN2QUlOHnTb1ayja53gUEr5sC4p9hZJqfr3pO7Q4=",
+        "ref": "refs/heads/main",
+        "rev": "d4f83e11dba5a2630b6ce6bfe7fd52417a96589d",
+        "revCount": 122,
+        "type": "git",
+        "url": "https://gitea.local.chriphost.de/christoph/cpp-masssprings"
+      },
+      "original": {
+        "type": "git",
+        "url": "https://gitea.local.chriphost.de/christoph/cpp-masssprings"
+      }
+    },
     "naersk": {
       "inputs": {
         "fenix": "fenix",
@@ -1170,7 +1209,7 @@
         "nixpkgs": [
           "nixpkgs"
         ],
-        "systems": "systems_3"
+        "systems": "systems_4"
       },
       "locked": {
         "lastModified": 1771135771,
@@ -1209,7 +1248,7 @@
     "nps": {
       "inputs": {
         "flake-compat": "flake-compat_4",
-        "flake-utils": "flake-utils",
+        "flake-utils": "flake-utils_2",
         "naersk": "naersk",
         "nixpkgs": [
           "nixpkgs"
@@ -1356,6 +1395,7 @@
         "hyprspace": "hyprspace",
         "impermanence": "impermanence",
         "lanzaboote": "lanzaboote",
+        "masssprings": "masssprings",
         "niri": "niri",
         "nix-alien": "nix-alien",
         "nix-flatpak": "nix-flatpak",
@@ -1489,6 +1529,21 @@
         "type": "github"
       }
     },
+    "systems_5": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    },
     "textfox": {
       "inputs": {
         "firefox-addons": "firefox-addons",
diff --git a/flake.nix b/flake.nix
index 87dd0695..9128679e 100644
--- a/flake.nix
+++ b/flake.nix
@@ -117,6 +117,9 @@
     # Realtime audio
     # musnix.url = "github:musnix/musnix";
     # musnix.inputs.nixpkgs.follows = "nixpkgs";
+
+    masssprings.url = "git+https://gitea.local.chriphost.de/christoph/cpp-masssprings";
+    masssprings.inputs.nixpkgs.follows = "nixpkgs";
   };
 
   # Outputs is a function that takes the inputs as arguments.
diff --git a/home/christoph/default.nix b/home/christoph/default.nix
index b01919da..afcce47c 100644
--- a/home/christoph/default.nix
+++ b/home/christoph/default.nix
@@ -580,6 +580,8 @@ in
             hunspell # I cna't type
             hunspellDicts.en_US
             hunspellDicts.de_DE
+
+            inputs.masssprings.packages.${stdenv.hostPlatform.system}.default
           ])
         ];
     };