diff --git a/pkgs/default.nix b/pkgs/default.nix
index f6dc064..611eb11 100644
--- a/pkgs/default.nix
+++ b/pkgs/default.nix
@@ -20,6 +20,7 @@ in
           scanf = final.callPackage ./epnix/tools/scanf {};
           epicscorelibs = final.callPackage ./epnix/python-modules/epicscorelibs {};
           pvxslibs = final.callPackage ./epnix/python-modules/pvxslibs {};
+          aioca = final.callPackage ./epnix/python-modules/aioca/default.nix {};
 
           # epicscorelibs needs at least 2.11.
           # TODO: remove for NixOS 24.11
@@ -91,7 +92,7 @@ in
 
       channel-finder-service = callPackage ./epnix/tools/channel-finder/service {};
 
-      inherit (final.python3Packages) lewis pyepics;
+      inherit (final.python3Packages) lewis pyepics aioca;
       inherit (callPackage ./epnix/tools/lewis/lib.nix {}) mkLewisSimulator;
 
       pcas = callPackage ./epnix/tools/pcas {};
diff --git a/pkgs/epnix/python-modules/aioca/default.nix b/pkgs/epnix/python-modules/aioca/default.nix
new file mode 100644
index 0000000..8f67699
--- /dev/null
+++ b/pkgs/epnix/python-modules/aioca/default.nix
@@ -0,0 +1,37 @@
+{
+  lib,
+  buildPythonPackage,
+  fetchFromGitHub,
+  setuptools,
+  setuptools-scm,
+  numpy,
+  epicscorelibs,
+  epnixLib,
+}:
+buildPythonPackage rec {
+  pname = "aioca";
+  version = "1.8.1";
+
+  pyproject = true;
+
+  src = fetchFromGitHub {
+    owner = "DiamondLightSource";
+    repo = "aioca";
+    rev = "${version}";
+    hash = "sha256-szM/sVqeWWUj84lq/wsxNCf/aZwoCySeTnuLD+hYLyc=";
+  };
+
+  build-system = [setuptools setuptools-scm];
+  dependencies = [
+    setuptools
+    numpy
+    epicscorelibs
+  ];
+
+  meta = {
+    description = "Asynchronous Channel Access client for asyncio and Python using libca via ctypes";
+    homepage = "https://DiamondLightSource.github.io/aioca";
+    license = lib.licenses.asl20;
+    maintainers = with epnixLib.maintainers; [synthetica];
+  };
+}