diff --git a/flake.lock b/flake.lock
index 3cc574d..f52fdae 100644
--- a/flake.lock
+++ b/flake.lock
@@ -62,16 +62,16 @@
         "utils": "utils_3"
       },
       "locked": {
-        "lastModified": 1710462307,
-        "narHash": "sha256-uA9Q6kYwIqBv5/Bl/+6/TpYN1yLBaG+deqVQIMmzHHA=",
+        "lastModified": 1711056288,
+        "narHash": "sha256-jWWYVIlR6UXE3NNgSa1w/wcZOZWiwUWdWbg56OGTthc=",
         "owner": "hytech-racing",
         "repo": "ht_can",
-        "rev": "940320b4d1673bca46f3dd4301dbd27b2d630345",
+        "rev": "3c7682d8fed7f8999e1dc99e3b6d90846c21a787",
         "type": "github"
       },
       "original": {
         "owner": "hytech-racing",
-        "ref": "27",
+        "ref": "37",
         "repo": "ht_can",
         "type": "github"
       }
@@ -198,11 +198,11 @@
     },
     "nixpkgs_3": {
       "locked": {
-        "lastModified": 1707650010,
-        "narHash": "sha256-dOhphIA4MGrH4ElNCy/OlwmN24MsnEqFjRR6+RY7jZw=",
+        "lastModified": 1711124224,
+        "narHash": "sha256-l0zlN/3CiodvWDtfBOVxeTwYSRz93muVbXWSpaMjXxM=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "809cca784b9f72a5ad4b991e0e7bcf8890f9c3a6",
+        "rev": "56528ee42526794d413d6f244648aaee4a7b56c0",
         "type": "github"
       },
       "original": {
@@ -262,11 +262,11 @@
     },
     "nixpkgs_7": {
       "locked": {
-        "lastModified": 1708702655,
-        "narHash": "sha256-qxT5jSLhelfLhQ07+AUxSTm1VnVH+hQxDkQSZ/m/Smo=",
+        "lastModified": 1711124224,
+        "narHash": "sha256-l0zlN/3CiodvWDtfBOVxeTwYSRz93muVbXWSpaMjXxM=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "c5101e457206dd437330d283d6626944e28794b3",
+        "rev": "56528ee42526794d413d6f244648aaee4a7b56c0",
         "type": "github"
       },
       "original": {
diff --git a/flake.nix b/flake.nix
index b3cfd84..5641f7d 100644
--- a/flake.nix
+++ b/flake.nix
@@ -10,7 +10,7 @@
     mcap.url = "github:RCMast3r/py_mcap_nix";
     foxglove-websocket.url = "github:RCMast3r/py_foxglove_webserver_nix";
     asyncudp.url = "github:RCMast3r/asyncudp_nix";
-    ht_can_pkg_flake.url = "github:hytech-racing/ht_can/27";
+    ht_can_pkg_flake.url = "github:hytech-racing/ht_can/37";
     nix-proto = { url = "github:notalltim/nix-proto"; };
   };
 
@@ -58,6 +58,16 @@
           };
       };
       my_overlays = [
+        (self: super: {
+            cantools = super.cantools.overridePythonAttrs (old: rec {
+              version = "39.4.5";
+              src = old.fetchPypi {
+                pname = "cantools";
+                inherit version;
+                # hash = "sha256-JQn+rtpy/OA2deLszSKEuxyttqBzcAil50H+JDHUdCE=";
+              };
+            });
+          })
         py_dbc_proto_gen_overlay
         py_data_acq_overlay
         proto_gen_overlay