diff --git a/pkgs/development/python-modules/python-gc100/default.nix b/pkgs/development/python-modules/python-gc100/default.nix
new file mode 100644
index 000000000000..d114cf48fd1f
--- /dev/null
+++ b/pkgs/development/python-modules/python-gc100/default.nix
@@ -0,0 +1,28 @@
+{
+  lib,
+  buildPythonPackage,
+  fetchPypi,
+  setuptools,
+}:
+
+buildPythonPackage rec {
+  pname = "python-gc100";
+  version = "1.0.3a0";
+  pyproject = true;
+
+  src = fetchPypi {
+    inherit pname version;
+    hash = "sha256-thuAmJUczTpKy/yZuVqGY3K3fyimw2PW/rGiyi7bwC4=";
+  };
+
+  build-system = [ setuptools ];
+
+  pythonImportsCheck = [ "gc100" ];
+
+  meta = {
+    description = "Python-based socket client for Global Cache GC100 digital I/O interface";
+    homepage = "https://github.com/davegravy/python-gc100";
+    license = lib.licenses.gpl3Plus;
+    maintainers = [ lib.maintainers.jamiemagee ];
+  };
+}
diff --git a/pkgs/servers/home-assistant/component-packages.nix b/pkgs/servers/home-assistant/component-packages.nix
index a920bb2e3219..83b9a6d04038 100644
--- a/pkgs/servers/home-assistant/component-packages.nix
+++ b/pkgs/servers/home-assistant/component-packages.nix
@@ -1971,7 +1971,8 @@
       ];
     "gc100" =
       ps: with ps; [
-      ]; # missing inputs: python-gc100
+        python-gc100
+      ];
     "gdacs" =
       ps: with ps; [
         aio-georss-gdacs
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 3a8f64ede79d..4426eb4a95ec 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -14647,6 +14647,8 @@ self: super: with self; {
 
   python-gammu = callPackage ../development/python-modules/python-gammu { };
 
+  python-gc100 = callPackage ../development/python-modules/python-gc100 { };
+
   python-gitlab = callPackage ../development/python-modules/python-gitlab { };
 
   python-glanceclient = callPackage ../development/python-modules/python-glanceclient { };