diff --git a/flake.lock b/flake.lock
index 108c259..4a8aec0 100644
--- a/flake.lock
+++ b/flake.lock
@@ -2,19 +2,20 @@
   "nodes": {
     "artiq": {
       "inputs": {
+        "artiq-comtools": "artiq-comtools",
         "mozilla-overlay": "mozilla-overlay",
-        "nixpkgs": "nixpkgs",
-        "sipyco": "sipyco",
+        "nixpkgs": "nixpkgs_2",
+        "sipyco": "sipyco_2",
         "src-migen": "src-migen",
         "src-misoc": "src-misoc",
         "src-pythonparser": "src-pythonparser"
       },
       "locked": {
-        "lastModified": 1644659315,
-        "narHash": "sha256-1Bbv+sQsdnFF4SAa3YtyKq5r2kbNtKCtt7vsMzJqTBI=",
+        "lastModified": 1644743725,
+        "narHash": "sha256-iCsb/4pQYm7svfbGClqveNsLU2KG1fXm/d4UvU0oApk=",
         "ref": "master",
-        "rev": "5a8928fbf351fcc252389710e9a9c588ea9aa0f2",
-        "revCount": 7969,
+        "rev": "6dfc854673eeba66f7c59be14f7f262f3a779acd",
+        "revCount": 7970,
         "type": "git",
         "url": "https://github.com/m-labs/artiq.git"
       },
@@ -23,6 +24,25 @@
         "url": "https://github.com/m-labs/artiq.git"
       }
     },
+    "artiq-comtools": {
+      "inputs": {
+        "nixpkgs": "nixpkgs",
+        "sipyco": "sipyco"
+      },
+      "locked": {
+        "lastModified": 1644743100,
+        "narHash": "sha256-XqxMq2l2DXSovV7r2k/FXjYRM3bvVl3Mjy+C1koVAx4=",
+        "owner": "m-labs",
+        "repo": "artiq-comtools",
+        "rev": "8a126dd7d0a3f2d50ae151ec633cd52587d98796",
+        "type": "github"
+      },
+      "original": {
+        "owner": "m-labs",
+        "repo": "artiq-comtools",
+        "type": "github"
+      }
+    },
     "mozilla-overlay": {
       "flake": false,
       "locked": {
@@ -71,6 +91,22 @@
         "type": "github"
       }
     },
+    "nixpkgs_3": {
+      "locked": {
+        "lastModified": 1644472683,
+        "narHash": "sha256-sP6iM4NksOYO6NFfTJ96cg+ClPnq6cdY30xKA1iYtyU=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "7adc9c14ec74b27358a8df9b973087e351425a79",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-21.11",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
     "root": {
       "inputs": {
         "artiq": "artiq"
@@ -78,14 +114,36 @@
     },
     "sipyco": {
       "inputs": {
-        "nixpkgs": "nixpkgs_2"
+        "nixpkgs": [
+          "artiq",
+          "artiq-comtools",
+          "nixpkgs"
+        ]
       },
       "locked": {
-        "lastModified": 1644634510,
-        "narHash": "sha256-5p88NKK/DTdb0F0+/7uObBohthdxHWLl782AaiPRf8E=",
+        "lastModified": 1644649772,
+        "narHash": "sha256-LE9L5bDSunCPEnuf5Ed8enTAXA2vkTSmjvqPX9ILO0Y=",
         "owner": "m-labs",
         "repo": "sipyco",
-        "rev": "e9e69527927761544ab6d62f751e1ff512d1e661",
+        "rev": "8e4382352bc64bd01c9db35d9c9b0ef42b8b9d3b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "m-labs",
+        "repo": "sipyco",
+        "type": "github"
+      }
+    },
+    "sipyco_2": {
+      "inputs": {
+        "nixpkgs": "nixpkgs_3"
+      },
+      "locked": {
+        "lastModified": 1644649772,
+        "narHash": "sha256-LE9L5bDSunCPEnuf5Ed8enTAXA2vkTSmjvqPX9ILO0Y=",
+        "owner": "m-labs",
+        "repo": "sipyco",
+        "rev": "8e4382352bc64bd01c9db35d9c9b0ef42b8b9d3b",
         "type": "github"
       },
       "original": {
diff --git a/flake.nix b/flake.nix
index 5bb7b21..53cc43e 100644
--- a/flake.nix
+++ b/flake.nix
@@ -126,6 +126,12 @@
             src = artiq.packages.x86_64-linux.pythonparser.src;
             dependencies = [ "regex" ];
           }
+          {
+            name = "artiq-comtools";
+            version = artiq.inputs.artiq-comtools.packages.x86_64-linux.artiq-comtools.version;
+            src = artiq.inputs.artiq-comtools.packages.x86_64-linux.artiq-comtools.src;
+            dependencies = [ "numpy" "aiohttp" "sipyco" ];
+          }
           {
             name = "artiq";
             version = artiq.packages.x86_64-linux.artiq.version;